Electrochemical non-enzymatic glucose sensors based on nano-composite of Co3O4 and multiwalled carbon nanotube
Publication date: Available online 3 April 2019Source: Chinese Chemical LettersAuthor(s): Xiaoyun Lin, Yanfang Wang, Miaomiao Zou, Tianxiang Lan, Yongnian NiAbstractNanocomposite of Co3O4 and multiwalled carbon nanotube (MCNT) was synthesised using one step solvothermal method, and an electrochemical non-enzymatic glucose sensor (Co3O4-MCNT/GCE) was successfully constructed by a dropping method. The obtained Co3O4 and Co3O4- MCNT were characterized and investigated by transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). Quantitative analysis of glucose was performed using the amperometric ...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Tunable morphologies of polymer capsules templated from cuprous oxide particles for control over cell association
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Hongyan Pei, Yanyan Bai, Jianman Guo, Zhiliang Gao, Qiong Dai, Qun Yu, Jiwei CuiAbstractOver the past two decades, layer-by-layer (LbL) assembly of micro/nanocapsules has been of interest for the investigation of bio-nano interactions to explore bio-applications, such as drug delivery. The choice of an appropriate template that can be easily dissolved under mild conditions is one of the challenges for the assembly of LbL capsules. Herein, we report the engineering of LbL capsules with tunable morphologies using cuprous oxide (Cu2O) p...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Core-shell lipid-polymer nanoparticles as a promising ocular drug delivery system to treat glaucoma
In conclusion, Brz-LPNs, as promising ocular drug delivery systems, are well worth developing in the future for glaucoma treatment.Graphical AbstractWe prepared the core-shell lipid-polymer nanoparticles (LPNs) as the carriers of brinzolamide (Brz-LPNs) and investigated the potential of enhancing sustained drug release, corneal permeation and intraocular pressure (IOP) reduction of Brz-LPNs. (Source: Chinese Chemical Letters)
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Synthesis and biological evaluation of piperidyl benzimidazole carboxamide derivatives as potent PARP-1 inhibitors and antitumor agents
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Xinwei Zhang, Cunlong Zhang, Lin Tang, Kuan Lu, Huan Zhao, Weibin Wu, Yuyang JiangABSTRACTWe have synthesized a series of compounds based on a piperidyl benzimidazole carboxamide structure, and tested their PARP-1 inhibitory activity, as well as cellular inhibitory activity. Some of them show great potency as PARP-1 inhibitors and antitumor activity, which are valuable for further research. In addition, the predicted ADME properties and proposed binding mode with PARP-1 of the compounds were obtained via computational simulation.Grap...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Intramolecular (4+3) cycloadditions of nitrogen-tethered epoxy enosilanes for the synthesis of heteropolycycles
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Jiayun He, Shuk Mei Lam, Jerome P.L. Ng, Wing-Tak Wong, Pauline ChiuAbstractFurans bearing epoxy enolsilane units via a tether that incorporates a nitrogen heteroatom, undergo intramolecular (4 + 3) cycloadditions to generate bis-heteroatomic polycyclic adducts having piperidine moieties in their frameworks. The cycloadducts, ultimately derived from furfural, a renewal chemical feedstock, are obtained with up to 4:1 dr and with ee retained from the epoxide.Graphical abstractFurans bearing epoxy enolsilane units linked b...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Sonochemical Synthesis of silver nanoparticles coated copper wire for low-temperature solid state bonding on silicon substrate
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Qiang Hu, Chen Zhao, Zhejuan Zhang, Jun Guo, Chenlu Yu, Zhuo Sun, Xianqing PiaoABSTRACTSilver nanoparticles (AgNPs) are directly grown on surface of ˜25 μm copper wire by ultrasound-assisted chemical reduction. Silver nitrate is used as precursors, when polyvinylpyrrolidone (PVP) is added as a controller of the dimension of AgNPs. Influence of growth parameters such as precursor’s concentration, ratio proportion of PVP and ultra-sonication on the growth of AgNPs coating are determined. The best morphology, size of the ...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

In-situ polymerized cross-linked binder for cathode in lithium-sulfur batteries
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Heng Ye, Danni Lei, Lu Shen, Bin Ni, Baohua Li, Feiyu Kang, Yan-Bing HeAbstractVolume expansion and polysulfide shuttle effect are the main barriers for the commercialization of Lithium-Sulfur (Li-S) battery. In this work, we in-situ polymerized a cross-linked binder in sulfur cathode to solve the aforementioned problems using a facile method under mild conditions. Polycarbonate diol (PCDL), triethanolamine (TEA) and hexamethylene diisocyanate (HDI) were chosen as precursors to prepare the cross-linked binder. The in-situ polymerized...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Synthesis of few-layer N-doped graphene from expandable graphite with melamine and its application in supercapacitors
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Yunpeng Wu, Xiaoyang Liu, Dandan Xia, Qiushi Sun, Deyang Yu, Shuanggan Sun, Xilong Liu, Yifei Teng, Weige Zhang, Xudong ZhaoAbstractIn this paper, we introduced a novel method to prepare the few-layer nitrogen-doped graphene (FNG) from expandable graphite with melamine. The super-capacitive properties of FNG were thoroughly characterized by a three-electrode system, and the results showed the FNG electrode achieved a specific capacitance as high as 83.8 m F/cm2 together with excellent cycling stability. This method coul...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Effect of mass transfer process on hydrogen adsorption on polycrystalline platinum electrode in sulfuric acid solution
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Wei Zhang, Yang Liu, Hainan Luo, Changwei PanAbstractThe underpotential adsorption of hydrogen (HUPD) is one of the most attractive fields in surface electrochemistry and electrocatalysis. In this work, the hydrogen adsorption on polycrystalline platinum electrode experimentally as well as on single crystal Pt(110) and Pt(100) electrode theoretically were studied. The effect of forced convection on the adsorption and desorption process of hydrogen was studied through adjusting the sampling rate of the microporous sampler closing to t...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Facile preparation of pH-responsive PEGylated prodrugs for activated intracellular drug delivery
In this study, three PEGylated acid-sensitive prodrugs DOX-PEG-DOX with different molecular weights, were prepared via Schiff-base reaction between aldehyde-modified PEG and the amino groups of doxorubicin (DOX). This kind of amphiphilic polymeric prodrug could be self-assemble into nanoparticles in aqueous solution. The average particle size and morphologies of the prodrug nanoparticles under different pH conditions were observed by dynamic light scattering (DLS) and transmission electron microscopy (TEM), respectively. It turned out that the nanoparticles could be kept stable in the physiological environment, but degrade...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Synthesis and biological evaluation of indole-3-carboxamide derivatives as antioxidant agents
Publication date: Available online 17 April 2019Source: Chinese Chemical LettersAuthor(s): Erfang Huang, Lan Zhang, Chuying Xiao, Guangpeng Meng, Bingqi Zhang, Jianshu Hu, David Chi-Cheong Wan, Qingguo Meng, Zhe Jin, Chun HuABSTRACTOxidative stress results in various pathologies and as consequence antioxidant agents have attracted uninterrupted attention. In this paper, a novel series of indole-3-carboxamide derivatives (6a–6l) were designed and synthesized based on the melatonin structure as novel antioxidants. All of them were evaluated for the antioxidant activities in vitro against human neuroblastoma SH-SY5Y cel...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

A facile synthesis of cajaninstilbene acid and its derivatives
Publication date: Available online 17 April 2019Source: Chinese Chemical LettersAuthor(s): Qi Chen, Kuo Lu, Chang Zheng, Xiao-Fang Xu, Jing Lin, Wei-Min ChenAbstractA four-step synthesis of methyl 6-formyl-2-hydroxy-4-methoxy-3-(3-methylbut-2-en-1-yl) benzoate (11) that can be used as building block for a facile synthesis of cajaninstilbene acid and its derivatives is reported. The synthesis of cajaninstilbene acid was accomplished in six steps with an overall yield of 20% starting from commercial materials by a synthesis whose key steps are TiCl4-mediated [3 + 3] cyclization and McMurry coupling.Graphical ab...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Polymeric nanoparticles of poly(2-oxazoline), tannic acid and doxorubicin for controlled release and cancer treatment
Publication date: Available online 17 April 2019Source: Chinese Chemical LettersAuthor(s): Lin Liu, Liying Yin, Hang Bian, Ning ZhangAbstractA straightforward coassembly strategy was developed for the preparation of polymeric nanoparticles driving by the intermolecular hydrogen bond between neutral poly(2-methyl-2-oxaozline) (PMeOx), tannic acid (TA) and doxorubicin hydrochloride (Dox). The occurrence of the hydrogen-bonding amongst the different functionalities within the formed nanoparticles was verified by infrared (IR) spectroscopy. Scanning electron microscopy (SEM), dynamic light scattering (DLS), UV-vis absorption a...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

A general strategy for one-step fabrication of biocompatible microcapsules with controlled active release
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Zeyong Sun, Chenjing Yang, Max Eggersdorfer, Jiecheng Cui, Yiwei Li, Mingtan Hai, Dong Chen, David A. WeitzAbstractFabrication of biocompatible core-shell microcapsules in a controllable and scalable manner remains an important but challenging task. Here, we develop a one-step microfluidic approach for the high-throughput production of biocompatible microcapsules, which utilizes single emulsions as templates and controls the precipitation of biocompatible polymer at the water/oil interface. The facile method enables the loading of va...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Ba3LaNa(PO4)3F: Tm3+, Dy3+: A tunable blue-white color emitting phosphor via energy transfer for UV white LEDs
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Dingdian Xu, Wei Zhou, Shujing Li, Dongsheng BaiAbstractA series of Tm3+/Dy3+ co-doped Ba3LaNa(PO4)3F (BLNPF) phosphors were synthesized successfully via a high-temperature solid-reaction, and luminescence properties were investigated. Upon near violet excitation, BLNPF: Tm3+, Dy3+ phosphors exhibit Tm3+:1D2-3F4 and Dy3+:4F9/2-6HJ (J = 15/2, 13/2, 11/2) transitions with different luminescence intensity. The emitting color of the obtained products was found to shift from blue to white as a result of efficient energy tran...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

Graphene-supported biomimetic catalysts with synergistic effect of adsorption and degradation for efficient dye capture and removal
Publication date: Available online 18 April 2019Source: Chinese Chemical LettersAuthor(s): Qin Li, Xiaopei Wang, Xueqing Xiong, Shuihong Zhu, Zhaohui Meng, Yongying Hong, Changxu Lin, Xiang Yang Liu, Youhui LinAbstractDesign and development of iron porphyrin-based artificial enzymes system have been attracting a lot of attention. Herein, without any toxic reductant and harsh processing, we present a facile one-pot method to fabricate bifunctional catalytic nanocomposites consisting of graphene and hemin by using vitamin c as a mild reduction reagent. The presence of graphene helps the formation of a high degree of highly a...
Source: Chinese Chemical Letters - April 19, 2019 Category: Chemistry Source Type: research

A ratiometric fluorescent probe for alkaline phosphatase with high sensitivity
Publication date: Available online 16 April 2019Source: Chinese Chemical LettersAuthor(s): Yang Yangyang, Zhang Chen, Pan Rizhao, Zhang Shiwei, Yao Shengtai, Tang Yao, Zhu Weilong, Wang Liyue, Zhu Weiping, Xu Yufang, Qian XuhongAbstractAlkaline phosphatase (ALP) is one of essential biomarkers in mammalian tissue. Here we report a ratiometric probe for ALP, which is rationally designed and synthesized by employing ESIPT fluorophore N-(3-(benzo[d]thiazol-2-yl)-4-hydroxyphenyl)benzamide (BTHPB). The enzymatic dephosphorylation converts the probe to BTHPB, which exhibits a large spectral red-shift (120 nm), allowing ext...
Source: Chinese Chemical Letters - April 17, 2019 Category: Chemistry Source Type: research

Sustainable routes for quantitative green selenocyanation of activated alkynes
Publication date: Available online 16 April 2019Source: Chinese Chemical LettersAuthor(s): Ling-Hui Lu, Zheng Wang, Weng Xia, Ping Cheng, Bo Zhang, Zhong Cao, Wei-Min HeAbstractMost organic reactions require the usage of volatile organic compounds in the synthesis, work-up and purification processes, thus resulting in major environmental pollution and high manufacturing cost. By using cheap biomass lactic acid as the reaction media and catalyst, a sustainable protocol for the synthesis of Z-3-selenocyanatoacrylates and analogues through green selenocyanation of activated alkynes has been achieved. A principal advantage of ...
Source: Chinese Chemical Letters - April 17, 2019 Category: Chemistry Source Type: research

How long a C–C bond can be? An example of extraordinary long C–C single bond in 1,2-diarylamino-o-carborane
Publication date: Available online 17 April 2019Source: Chinese Chemical LettersAuthor(s): Yile Wu, Jie Zhang, Zuowei XieABSTRACTHow long a C–C bond can be? A question has long fascinated chemists. This work reports an example of extraordinary long C–C bond distance of 1.990(4) Å observed in single-crystal X-ray structure of 1,2-(NHMes)2-o-carborane (2; Mes = 2,4,6-trimethylphenyl), the longest C–C single bond known thus far. DFT calculations show that hyperconjugation of lone pairs of the nitrogen atoms into the empty σ* orbital of the cage C–C bond is the origin of the bo...
Source: Chinese Chemical Letters - April 17, 2019 Category: Chemistry Source Type: research

Advances in self-assembly and regulation of aromatic carboxylic acid derivatives at HOPG interface
Publication date: Available online 17 April 2019Source: Chinese Chemical LettersAuthor(s): Jianqiao Li, Xiaoyi Zu, Yuxin Qian, Wubiao Duan, Xunwen Xiao, Qingdao ZengAbstractAromatic carboxylic acid self-assembly has been a hot research field for many scientists due to its strong coordination ability and flexible coordination mode. The hydrogen bond formed between aromatic carboxylic acids is a strong intermolecular force and has directionality and saturation, which plays a very important role in the self-assembly and regulation of aromatic carboxylic acids. In this review, we introduce surface organization formed by aromat...
Source: Chinese Chemical Letters - April 17, 2019 Category: Chemistry Source Type: research

Chiral self-assembly regulated photon upconversion based on triplet-triplet annihilation
Publication date: Available online 17 April 2019Source: Chinese Chemical LettersAuthor(s): Xujin Qin, Jianlei Han, Dong Yang, Wenjie Chen, Tonghan Zhao, Xue Jin, Peipei Guo, Pengfei DuanABSTRACTPhoton upconversion (UC) based on triplet-triplet annihilation (TTA) in quasi-solid or solid state has been attracting much research interest due to its great potential applications. To get effective UC, precisely controlled donor-acceptor interaction is vitally important. Chiral self-assembly provides a powerful approach for sophisticated regulation of molecular interaction. Here we report a chiral self-assembly controlled TTA-UC s...
Source: Chinese Chemical Letters - April 17, 2019 Category: Chemistry Source Type: research

New cyclopiane diterpenes with anti-inflammatory activity from the sea sediment-derived fungus Penicillium sp. TJ403-2
Publication date: Available online 17 April 2019Source: Chinese Chemical LettersAuthor(s): Fengli Li, Weiguang Sun, Sitian Zhang, Weixi Gao, Shuang Lin, Beiye Yang, Chenwei Chai, Huaqiang Li, Jianping Wang, Zhengxi Hu, Yonghui ZhangAbstractThree new rare cyclopiane diterpenes (1–3), together with thirteen known compounds (4–16), were isolated and identified from a sea sediment-derived fungus Penicillium sp. TJ403-2. The planar and relative structures of compounds 1–3 were elucidated by HRESIMS, one- and two-dimensional NMR analyses, and their absolute configurations were further established by X-ray cryst...
Source: Chinese Chemical Letters - April 17, 2019 Category: Chemistry Source Type: research

New ZnCe catalyst encapsulated in SBA-15 in the production of 1,3-butadiene from ethanol
We report a highly efficient ZnO-CeO2/SBA-15 catalyst prepared by solid-state grinding method with organic template. The limited space between the template and the silica wall of SBA-15 and the strong interaction between metal ions and template improve the dispersion of metal oxides, which help obtain more effective acid sites, resulting in a 1,3-butadiene selectivity as high as ˜45%. (Source: Chinese Chemical Letters)
Source: Chinese Chemical Letters - April 17, 2019 Category: Chemistry Source Type: research

Adsorption of Nin (n = 1‒4) clusters on perfect and O-defective CuAl2O4 surfaces: A DFT study
Publication date: Available online 28 March 2019Source: Chinese Chemical LettersAuthor(s): Li Li, Liu Shi, Xiaohu Yu, Shaojun Qing, Zhixian Gao, Qiquan Luo, Gang Feng, Rongbin ZhangAbstractThe density functional theory was employed to investigate the adsorption of Nin (n = 1–4) on the perfect and O-defect CuAl2O4 surfaces. The computational results show that for single Ni atom on the perfect spinel (100) surface, the adsorption energy is −5.30 eV, much larger than Ni on other CuAl2O4 surfaces. The adsorption of Nin (n = 1–4) absorbed on the O-defect CuAl2O4 (100) surface...
Source: Chinese Chemical Letters - April 16, 2019 Category: Chemistry Source Type: research

Diastereo- and enantioselective palladium-catalyzed dearomative [4+2] cycloaddition of 3-nitroindoles
Publication date: Available online 16 April 2019Source: Chinese Chemical LettersAuthor(s): Jia-Jia Suo, Juan Du, Yang-Jie Jiang, Di Chen, Chang-Hua Ding, Xue-Long HouAbstractA Pd-catalyzed asymmetric decarboxylative [4 + 2] cycloaddition of 3-nitroindoles and vinyl benzoxazinanones is developed through a dearomatization approach. The reaction provides an efficient protocol for constructing a series of chiral tetrahydro-5H-indolo[2,3-b]quinolines in high yields and with excellent diastereo- and enantioselectivities.Graphical abstractReviewed herein is the recent progress of the first-row transition metals cata...
Source: Chinese Chemical Letters - April 16, 2019 Category: Chemistry Source Type: research

High-throughput model-building and screening of zeolitic imidazolate frameworks for CO2 capture from flue gas
Publication date: Available online 14 April 2019Source: Chinese Chemical LettersAuthor(s): Lixia Yang, Chao Shi, Lin Li, Yi LiAbstractTo find potential zeolitic imidazolate frameworks (ZIFs) for CO2 capture from flue gas, we built 169,898 ZIF models from 84,949 hypothetical zeolite networks. By calculating their lattice energies, accessible volumes to CO2, the isosteric adsorption heat of H2O (Qst), Henry's constant ratio (SKH) of CO2/N2, percent regenerability (R%), CO2 working capacity (ΔNCO2), CO2/N2 adsorption selectivity (SCO2/N2) and adsorbent performance score (APS), we identified 49 hydrophobic ZIF structures...
Source: Chinese Chemical Letters - April 16, 2019 Category: Chemistry Source Type: research

A low-temperature synthesis-induced defect formation strategy for stable hierarchical porous metal–organic frameworks
Publication date: Available online 13 April 2019Source: Chinese Chemical LettersAuthor(s): Ge Huang, Yue Wang, Tianfu LiuAbstractA stable hierarchical porous metal–organic framework PCN-56 with abundant Lewis acid sites (denoted as Defective-PCN-56) was synthesized by the low-temperature synthesis-induced defect formation method. The existence of mesopore in structure was confirmed by N2 sorption isotherm and the successful encapsulation of large dye molecules. The Defective-PCN-56 has higher loading capacity toward anti-cancer drug Doxo compared with that of “nearly ideal-crystal” (denoted as Ideal-PCN-5...
Source: Chinese Chemical Letters - April 14, 2019 Category: Chemistry Source Type: research

Additive-free non-fullerene organic solar cells with random copolymers as donors over 9% power conversion efficiency
In this study, a series of random conjugated polymers (PBDB-TBTn) as donors were designed and synthesized. In these polymers, benzodithiophene unit with thiophene conjugated side chains (BDT) are donor part, and two different content of benzo[1,2-c:4,5-c′]dithiophene-4,8-dione (BDD) and difluorobenzothiadizole (BT) linked alkylthiophene are acceptor unit. Polymer solar cells (PSCs) were fabricated with ITIC as an acceptor, and over the power conversion efficiency (PCE) of 9% was obtained, with open circuit voltage (Voc) of 0.86 V, short-circuit current density (Jsc) of 16.84 mA/cm2, and fill factor (FF)...
Source: Chinese Chemical Letters - April 14, 2019 Category: Chemistry Source Type: research

Diastereo- and enantioselective palladium-catalyzed dearomative [4+2] cycloaddition of 3-nitroindoles
Publication date: Available online 13 April 2019Source: Chinese Chemical LettersAuthor(s): Jia-Jia Suo, Juan Du, Yang-Jie Jiang, Di Chen, Chang-Hua Ding, Xue-Long HouAbstractA Pd-catalyzed asymmetric decarboxylative [4 + 2] cycloaddition of 3-nitroindoles and vinyl benzoxazinanones is developed through a dearomatization approach. The reaction provides an efficient protocol for constructing a series of chiral tetrahydro-5H-indolo[2,3-b]quinolines in high yields and with excellent diastereo- and enantioselectivities.Graphical Abstract (Source: Chinese Chemical Letters)
Source: Chinese Chemical Letters - April 14, 2019 Category: Chemistry Source Type: research

Sensitive and selective molecularly imprinted electrochemical sensor based on multi-walled carbon nanotubes for doxycycline hyclate determination
Publication date: Available online 12 April 2019Source: Chinese Chemical LettersAuthor(s): Zeyu Xu, Xingxing Jiang, Shuping Liu, Minghui YangAbstractAn electrochemical sensor for doxycycline hyclate (DC) detection with high sensitivity and good selectivity is reported. The sensor was fabricated by electro-polymerization of molecularly imprinted polymers (MIPs) in the presence of DC onto multi-walled carbon nanotubes modified glassy carbon electrode (MWCNTs/GCE). The MWCNTs can significantly increase the current response of the sensor, leading to enhanced sensitivity. The MIPs provide selective recognition sites for DC dete...
Source: Chinese Chemical Letters - April 13, 2019 Category: Chemistry Source Type: research

Electrochemical synthesis of β-hydroxy-, β-alkoxy-, and β-carbonyloxy sulfones by vicinal difunctionalization of olefins
Publication date: Available online 13 April 2019Source: Chinese Chemical LettersAuthor(s): Zhefan Zhang, Jiyao Yan, Dengke Ma, Jianwei SunAbstractAn electrochemical vicinal heterodifunctionalization of olefins for the synthesis of β-oxysulfones is described. With suitable choice of the conditions, including current, electrodes, and electrolyte, this oxidation reaction proceeded efficiently in an undivided cell without the use of a stoichiometric chemical oxidant. In addition to the previously established synthesis of β-hydroxysulfones in the presence of water, minor modification of this protocol by using either e...
Source: Chinese Chemical Letters - April 13, 2019 Category: Chemistry Source Type: research

Construction of [1]rotaxanes with pillar[5]arene as the wheel and terpyridine as the stopper
Publication date: Available online 13 April 2019Source: Chinese Chemical LettersAuthor(s): Ling-Ling Zhao, Ying Han, Chao-Guo YanAbstractThe condensation reaction of ω-aminoalkyleneamide-functionalized pillar[5]arenes with 2-(4-([2,2':6',2''-terpyridin]-4'-yl)phenoxy)acetic acid or 4-(4-([2,2':6',2''-terpyridin]-4'-yl)phenoxy)butanoic acid in dry chloroform at room temperature under the catalysis of HOBT/EDCl resulted in novel pillar[5]arene diamido-bridged terpyridine derivatives. 1H NMR and 2D NOESY spectra clearly indicated that the interesting [1]rotaxanes were formed by longer alkylene such as propylene, butylen...
Source: Chinese Chemical Letters - April 13, 2019 Category: Chemistry Source Type: research

Integrating bimetallic AuPd nanocatalysts with a 2D aza-fused π-conjugated microporous polymer for light-driven benzyl alcohol oxidation
Publication date: Available online 13 April 2019Source: Chinese Chemical LettersAuthor(s): Yunong Li, Lei Wang, Jingxiang Low, Di Wu, Canyu Hu, Wenbin Jiang, Jun Ma, Chengming Wang, Ran Long, Li Song, Hangxun Xu, Yujie XiongAbstractEfficient catalytic system with low energy consumption exhibits increasing importance due to the upcoming energy crisis. Given this situation, it should be an admirable strategy for reducing energy input by effectively utilizing incident solar energy as a heat source during catalytic reactions. Herein, aza-fused π-conjugated microporous polymer (aza-CMP) with broad light absorption and high p...
Source: Chinese Chemical Letters - April 13, 2019 Category: Chemistry Source Type: research

Coumarinocoumarin-based fluorescent probe for the sensitive and selective detection of hydrazine in living cells and zebra fish
Publication date: Available online 13 April 2019Source: Chinese Chemical LettersAuthor(s): Qian Fang, Lei Yang, Haiqing Xiong, Shaohui Han, Yun Zhang, Jingpei Wang, Wenqiang Chen, Xiangzhi SongAbstractA coumarinocoumarin-based fluorescent probe, JCCA, was developed for the detection of N2H4. JCCA exhibited a fast turn-on fluorescence enhancement in response to N2H4 with good selectivity, sensitivity and a detection limit of 7.4 nmol/L. Significantly, JCCA displayed a good capability for visualizing N2H4 in living cells and zebra fish.Graphical abstractA new fluorescent probe was developed for the detection of hydraz...
Source: Chinese Chemical Letters - April 13, 2019 Category: Chemistry Source Type: research

Enhanced electrochemical performance and mechanism study of AgLi1/3Sn2/3O2 for lithium storage
Publication date: Available online 10 April 2019Source: Chinese Chemical LettersAuthor(s): Fan Lu, Jie Yang, Ling Zhou, Xinyue Wang, Yin Yang, Jumei LiAbstractHerein, AgLi1/3Sn2/3O2 with delafossite structure was prepared by treating the layered compound Li2SnO3 with molten AgNO3 via ion exchange of Li+ for Ag+. The structure characterization and the electrochemical performance of AgLi1/3Sn2/3O2 was thoroughly investigated. AgLi1/3Sn2/3O2 is found to possess stacking lamellar morphology, which means small electrochemical impedance and so facilitates charge transfer kinetics during the cycling. Compared with Li2SnO3, due to...
Source: Chinese Chemical Letters - April 11, 2019 Category: Chemistry Source Type: research

High-refractive index acrylate polymers for applications in nanoimprint lithography
Publication date: Available online 10 April 2019Source: Chinese Chemical LettersAuthor(s): Yunhui Tang, Stefano Cabrini, Jun Nie, Carlos Pina-HernandezAbstractThe development of polymeric optical materials with a higher refractive index, transparency in the visible spectrum region and easier processability is increasingly desirable for advanced optical applications such as microlenses, image sensors, and organic light-emitting diodes. Most acrylates have a low refractive index (around 1.50) which does not meet the high performance requirements of advanced optical materials. In this research, three novel acrylates were synt...
Source: Chinese Chemical Letters - April 11, 2019 Category: Chemistry Source Type: research

Fabrication of doxorubicin and chlorotoxin-linked Eu-Gd2O3 nanorods with dual-model imaging and targeted therapy of brain tumor
Publication date: Available online 10 April 2019Source: Chinese Chemical LettersAuthor(s): Weina Zhang, Zhongbing Huang, Ximing Pu, Xianchun Chen, Guangfu Yin, Lei Wang, Fei Zhang, Fabao GaoAbstractIt is urgent to find a technology accurately to better diagnose and treat to brain tumor. Eu-doped Gd2O3 nanorods (Eu-Gd2O3 NRs) with paramagnetic and fluorescent properties were conjugated with doxorubicin (Dox) and chlorotoxin (CTX) via PEGylation, hydrazone bond and sulfur bond (named as CTX-NRs-Dox), and these NRs could release more Dox in lower pH environment. The results of cell experiments indicated that CTX-NRs-Dox had o...
Source: Chinese Chemical Letters - April 11, 2019 Category: Chemistry Source Type: research

CO2/NIR light dual-controlled nanoparticles for dsDNA unzipping
Publication date: Available online 11 April 2019Source: Chinese Chemical LettersAuthor(s): Yanjing Wang, Hongbo Yuan, Dawei Li, Chengfen XingAbstractBoth of carbon dioxide (CO2) and near-infrared (NIR) light as triggers for non-invasive remotely control are attracting wide attentions due to their good biocompatibility and easy operation. Here, CO2/NIR light dual controlled nanoparticles are proposed to remotely regulate the unzipping of dsDNA by using imidazole functionalized conjugated polymer nanoparticles (imidazole-CPNs). The dsDNA successfully coats on the shell of imidazole-CPNs to form imidazole-CPNs/dsDNA assembly ...
Source: Chinese Chemical Letters - April 11, 2019 Category: Chemistry Source Type: research

Photodynamic therapy based on organic small molecular fluorescent dyes
Publication date: Available online 9 April 2019Source: Chinese Chemical LettersAuthor(s): Li Li, Yisha Chen, Weijie Chen, Ying Tan, Haiyan Chen, Jun YinAbstractPhotodynamic therapy (PDT) has shown promise as an effective treatment modality for cancer and other localized diseases due to its noninvasive properties and spatiotemporal selectivity. Near-infrared (NIR) fluorescent dyes based on organic small molecules are characterized with low cytotoxicity, good biocompatibility and excellent phototoxicity, which are widely used in PDT. In this review, we attempt to summarize the development of imaging-induced PDT based on orga...
Source: Chinese Chemical Letters - April 10, 2019 Category: Chemistry Source Type: research

Elucidating dominant factors of PO43–, Cd2+ and nitrobenzene removal by biochar: A comparative investigation based on distinguishable biochars
Publication date: Available online 9 April 2019Source: Chinese Chemical LettersAuthor(s): Zhanglin Liu, Dong Tian, Fei Shen, Lulu Long, Yanzong Zhang, Gang Yang, Yongmei Zeng, Jing Zhang, Jinsong He, Ying Zhu, Shihuai DengABSTRACTBiochars produced from crab shell (CSB), oak sawdust (OB), Jerusalem artichoke tuber (JAB) and sorghum grain (SB) displayed distinguishable adsorption-related characteristics, such as specific surface area (SSA), ash content and acidic oxygen-containing functional groups (AFGs), which linked to the biochar adsorption mechanisms of most pollutants. Herein, PO43–, Cd2+, and nitrobenzene (NB) w...
Source: Chinese Chemical Letters - April 10, 2019 Category: Chemistry Source Type: research

A ketone-functionalized aromatic saddle as a potential building block for negatively curved carbon nanobelts
Publication date: Available online 8 April 2019Source: Chinese Chemical LettersAuthor(s): Kwan Yin Cheung, Qian MiaoAbstractA novel ketone-functionalized aromatic saddle consisting of 72 sp2 carbon atoms is successfully synthesized and unambiguously identified with X-ray crystallography. It can, in principle, be used as a building block for synthesis of negatively curved carbon nanobelts and for a bottom-up approach to negatively curved carbon allotropes.Graphical AbstractHerein, we report the synthesis and crystal structure of a novel ketone-functionalized aromatic saddle, which is a potential building block for synthesis...
Source: Chinese Chemical Letters - April 10, 2019 Category: Chemistry Source Type: research

Preparation and reducing-responsive property of a novel functional polyurethane nanoemulsion
Publication date: Available online 8 April 2019Source: Chinese Chemical LettersAuthor(s): He Qin, Hong Zhang, Xiaoteng Zhou, Danfei Gu, Lingxiao Li, Chengyou KanAbstractAs a kind of stimuli-responsive materials, the disulfide-containing material has received a tremendous amount of interest. A novel functional disulfide-containing waterborne polyurethane (DS-WPU) nanoemulsion was prepared via a one-step in situ phase inverse emulsification technique and its reducing-responsive property was investigated using dithiothreitol as the reductant. Results showed that the DS-WPU nanoemulsion had a uniform particle size in nanoscale...
Source: Chinese Chemical Letters - April 10, 2019 Category: Chemistry Source Type: research

Synthesis of carbon dots with a tunable photoluminescence and their applications for the detection of acetone and hydrogen peroxide
In this study, green emissive nitrogen-doped carbon dots (N-CDs) are synthesized from p-hydroquinone and ethylenediamine through a simple hydrothermal method. The as-prepared N-CDs possess a robust excitation-independent green luminescence and a high PLQY of up to 15.9%. Further spectroscopic characterization indicates that the high PLQY is achieved by the balance of nitrogen doping states and the surface passivation extent in CDs. The N-CDs also exhibit solvent-dependent multi-color emissive property and distinct PLQY in different solvents (the maximum can reach up to 25.3%). Furthermore, the as-prepared N-CDs are applied...
Source: Chinese Chemical Letters - April 10, 2019 Category: Chemistry Source Type: research

DES-Fe3O4 composite for rapid extraction of residual plant growth regulators in edible vegetable oil
Publication date: Available online 5 April 2019Source: Chinese Chemical LettersAuthor(s): Ting Tan, Xiaomei Xu, Yiqun WanABSTRACTA rapid DES-Fe3O4 microextraction coupled with liquid chromatography method was ingeniously developed for simultaneous control of five typical plant growth regulators in a planting cycle including indole-3-acetic acid, abscisic acid, thidiazuron, 1-naphthylacetic acid and forchlorfenuron. The experiments were carried out with one type of carboxylic acid-assisted deep eutectic solvent (nChCl: nacetic acid = 1:3) as extractant, coupled with ultrasonic wave extraction for 30 min...
Source: Chinese Chemical Letters - April 6, 2019 Category: Chemistry Source Type: research

Aggregation-induced emission enhancement of yellow photoluminescent carbon dots for highly selective detection of environmental and intracellular copper (II) ions
Publication date: Available online 4 April 2019Source: Chinese Chemical LettersAuthor(s): Wenyi Lv, Min Lin, Rongsheng Li, Qianqian Zhang, Hui Liu, Jian Wang, Chengzhi HuangAbstractCarbon dots (CDs) are prepared through a simple one-step hydrothermal treatment of o-phenylendiamine (OPD) and show yellow photoluminescent (PL) emission under the ultraviolet excitation, which can be further enhanced by Cu2+ ions owing to Cu2+ ions induced aggregation of OPD-CDs through the coordination of Cu2+ with amino groups on the surface of OPD-CDs. The aggregation induced emission enhancement (AIEE) property enables it feasible to develo...
Source: Chinese Chemical Letters - April 5, 2019 Category: Chemistry Source Type: research

Pure organic room-temperature phosphorescent N-allylquinolinium salts as anti-counterfeiting materials
Publication date: Available online 4 April 2019Source: Chinese Chemical LettersAuthor(s): Qingxia Xiong, Chao Xu, Nianming Jiao, Xiang Ma, Yanqiang Zhang, Suojiang ZhangABSTRACTPure organic room-temperature phosphorescence (RTP) materials have been attracting much attention recently. Herein, we report a facile approach combining heavy atom effect and external solvent stimuli to realize RTP. N-Allylquinolinium bromide under 365 nm UV exhibited intense green RTP emission with response upon adding chloroform. This interesting phenomenon endowed N-allylquinolinium bromide great potential as an anti-counterfeiting materi...
Source: Chinese Chemical Letters - April 5, 2019 Category: Chemistry Source Type: research

Magnetic responsive polymer nanofiber composites for easy collecting chemical spills
We describe a simple method to prepare magnetic responsive polydivinylbenzene (PDVB) nanofiber composites by precipitated cationic living polymerization in the present of oleic acid capped Fe3O4 nanoparticles (NPs). The Fe3O4 NPs are encapsulated with the PDVB forming dendrites, from which thin nanofibers are grown in the tip-growth mode. The thin nanofibers are interwoven with the thick nanofibers forming robust composite network. The composites are magnetic responsive and highly efficient to gel almost all chemicals. Separation of the gelled chemicals from water becomes easier with a magnet. The performance is promising ...
Source: Chinese Chemical Letters - April 4, 2019 Category: Chemistry Source Type: research

Biomimetic nanochannel membrane for cascade response of borate and cis-hydroxyl compounds: an IMP logic gate device
Publication date: Available online 2 April 2019Source: Chinese Chemical LettersAuthor(s): Meitao Deng, Meng Yang, Yaqing Xu, Yuqiong Sun, Qing Wang, Jianbo Liu, Jin Huang, Xiaohai Yang, Kemin WangABSTRACTBiomimetic nanodevice is an important branch to expand the potential applications of artificial nanochannels. Here, we constructed nanochannels for cascade response of borate and cis-hydroxyl compounds by modifying the nanochannels of track-etched polycarbonate (TEPC) membranes with polyvinyl alcohol (PVA). Firstly, borate bound to PVA and increased the negative charge density on the surface of the nanochannels, which obst...
Source: Chinese Chemical Letters - April 4, 2019 Category: Chemistry Source Type: research

Surfactant-assisted fabrication of graphene frameworks endowing epoxy composites with superior thermal conductivity
Publication date: Available online 2 April 2019Source: Chinese Chemical LettersAuthor(s): Fan Zhang, Chen Ye, Wen Dai, Lv Le, Qilong Yuan, Kuan W.A. Chee, Yang Ke, Nan Jiang, Cheng-Te Lin, Zhaolin Zhan, Dan Dai, Li HeABSTRACTWith the rapid growth in electronic device performance, there has been an increasing demand for thermally conductive polymer composites to handle the thermal management issue, thus contributing to the great importance to develop the graphene framework, which is evaluated as the most promising reinforcements for enhancing the thermal conductivity of polymer. Vacuum filtration is a common method to fabri...
Source: Chinese Chemical Letters - April 4, 2019 Category: Chemistry Source Type: research

Design optimized intermixed phase by tuning polymer-fullerene intercalation for free charge generation
Publication date: Available online 3 April 2019Source: Chinese Chemical LettersAuthor(s): Qiang Zhang, Jiangang Liu, Xinhong Yu, Yanchun HanABSTRACTThe intermixed phase is important in effective charge separation due to the formation of cascaded energy landscape between intermixed phase and pure phases in polymer/fullerene solar cells. However, the quantitative relationship between the charge separation and the content of intermixed phase has not been investigated clearly so far. Here, we proposed to tune the content of the polymer/PC71BM intermixed phase by changing the polymer solution conformation. Poly[2,5-bis(3-tetrad...
Source: Chinese Chemical Letters - April 4, 2019 Category: Chemistry Source Type: research