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Applications of covalent organic frameworks for the elimination of dyes from wastewater: A state-of-the-arts review
Chemosphere. 2023 Sep 19:140223. doi: 10.1016/j.chemosphere.2023.140223. Online ahead of print.ABSTRACTCovalent organic frameworks (COFs) are class of porous coordination polymers made up of organic building blocks joined together by covalent bonding through thermodynamic and controlled reversible polymerization reactions. This review discussed versatile applications of COFs for remediation of wastewater containing dyes, emphasizing the advantages of both pristine and modified materials in adsorption, membrane separation, and advanced oxidations processes. The excellent performance of COFs towards adsorption and membrane f...
Source: Chemosphere - September 21, 2023 Category: Chemistry Authors: Zakariyya Uba Zango Ayed M Binzowaimil Osamah A Aldaghri Mohamed Hassan Eisa Abdurrahman Garba Naser M Ahmed Jun Wei Lim Hui-Suan Ng Hanita Daud Khairulazhar Jumbri Kuan Shiong Khoo Khalid Hassan Ibnaouf Source Type: research
Investigation on Cr(VI)-bioreduction mechanism and reduction products by a novel Microbacterium sp. strain NEAU-W11
In this study, a novel Cr(VI)-reducing strain, Microbacterium sp. NEAU-W11, was reported, and its reduction mechanism was investigated. Microbacterium sp. NEAU-W11 could effectively degrade Cr(VI) under the conditions of pH 7-10, 15-35 °C, and the coexistence of metal pollutants such as Pb and Ni, etc. In addition, both Fe3+ and Cu2+ could improve the reducing ability of strain NEAU-W11, and glucose and lactose as electron donors also had promoting effect. Heat treatment of resting cells confirmed that chromium removal was not biological sorption but biological reduction. The active reductase of strain NEAU-W11 to chromiu...
Source: Chemosphere - September 21, 2023 Category: Chemistry Authors: Tingting Li Dandan Du Chenxu Li Junlei Zhao Lifeng Guo Xiangjing Wang Junwei Zhao Wensheng Xiang Source Type: research
Impact of lanadfill characteristics on the atmospheric exposure to halogenated flame retardants in gulls
The objective of this study was to investigate how atmospheric exposure in ring-billed gulls to PBDEs and other HFRs is influenced by selected landfill characteristics (i.e., daily cover materials, waste types and tonnage). Miniature passive air samplers (PASs) combined with GPS dataloggers were deployed for ten days during six years on the back of wild-caught ring-billed gulls breeding in the Montreal area. Atmospheric levels of several PBDEs and other HFRs determined in PASs were found to increase with the presence probability of gulls in the two largest landfills using automotive shredder residues as daily cover materia...
Source: Chemosphere - September 21, 2023 Category: Chemistry Authors: Ana ïs Kerric Marc J Mazerolle Manon Sorais Jean-Fran çois Giroux Jonathan Verreault Source Type: research
Advancing water treatment sustainability: Investigating electrified Ti < sub > 3 < /sub > C < sub > 2 < /sub > T < sub > x < /sub > composite membranes for minimizing microplastic fouling
This study illustrates the potential of MXene-based membranes for mitigating MP fouling and paves the way for future research on membrane materials that can enhance system performance.PMID:37734506 | DOI:10.1016/j.chemosphere.2023.140224
Source: Chemosphere - September 21, 2023 Category: Chemistry Authors: Mariam Ouda Ravi P Pandey Fawzi Banat Shadi W Hasan Source Type: research
Galantamine-memantine hybrids for Alzheimer's disease: The influence of linker rigidity in biological activity and pharmacokinetic properties
Eur J Med Chem. 2023 Sep 12;261:115803. doi: 10.1016/j.ejmech.2023.115803. Online ahead of print.ABSTRACTNeurodegenerative processes characterizing Alzheimer's disease (AD) are strictly related to the impairment of cholinergic and glutamatergic neurotransmitter systems which provoke synaptic loss. These experimental evidences still represent the foundation of the actual standard-of-care treatment for AD, albeit palliative, consisting on the coadministration of an acetylcholinesterase inhibitor and the NMDAR antagonist memantine. In looking for more effective treatments, we previously developed a series of galantamine-meman...
Source: European Journal of Medicinal Chemistry - September 21, 2023 Category: Chemistry Authors: Filippo Basagni Jose A Ortega Sine M Bertozzi Andrea Armirotti Maria Summa Rosalia Bertorelli Manuela Bartolini Ian R Mellor Martina Bedeschi Giovanni Bottegoni Vittorio Lembo Anna Minarini Andrea Cavalli Michela Rosini Source Type: research
Effect of cycloastragenol and punicalagin on Prp(106-126) and A β(25-35) oligomerization and fibrillizaton
In this study, we have examined the effect of two NPs, cycloastragenol (CAG) and punicalagin (PCG), on the metal-induced oligomerization and aggregation of Aβ25-35 and PrP106-126 peptides. The peptide aggregation and inhibitory properties of both NPs were examined by the thioflavin-T (ThT) assay, MALDI-TOF, circular dichroism (CD) spectroscopy, and transmission electron microscopy (TEM). Among the two NPs, PCG significantly binds to the peptides, chelates metal ions (Cu2+ and Zn2+), inhibits peptide aggregation, substantially reduces oxidative stress, and controls the production of reactive oxygen species (ROS). Both NPs ...
Source: Biophysical Chemistry - September 21, 2023 Category: Chemistry Authors: Govinda R Navale Rahul Chauhan Saakshi Saini Partha Roy Kaushik Ghosh Source Type: research
A Guanidine-Supported π-Complex of Germanium Amenable to Intramolecular C-C Cleavage in Arene and Ge Atom Transfer
Chemistry. 2023 Sep 21:e202301981. doi: 10.1002/chem.202301981. Online ahead of print.ABSTRACTThe germylone dimNHCGe (dimNHC = diimino N-heterocyclic carbene) reacts with azides N3R (R = SiMe3 or p-tolyl) to furnish the first examples of germanium π-complexes, i.e. guanidine-ligated compounds (dimNHI-SiMe3)Ge (NHI= N-heterocyclic imine, R= SiMe3) and (dimNHI-Tol)Ge (R= p-tolyl). DFT calculations suggest that these species are formed by a Staudinger type replacement of dinitrogen in the azide by a nucleophilic germylone, leading to a transient carbene adduct of iminogermylidene. Heating a solution of compound (dimNHI-SiMe3...
Source: Chemistry - September 21, 2023 Category: Chemistry Authors: Medet Segizbayev Minh Tho Nguyen Dmitry G Gusev Anton Dmitrienko Melanie Pilkington Art van der Est Georgii Nikonov Source Type: research
Construction of Diversified Penta-Spiro-Heterocyclic and Fused-Heterocyclic Frameworks with Potent Antitumor Activity
Chemistry. 2023 Sep 21:e202302677. doi: 10.1002/chem.202302677. Online ahead of print.ABSTRACTInvited for the cover of this issue are Xuewu Liang, Hong Liu and co-workers at the Shanghai Institute of Materia Medica and Shenyang Pharmaceutical University. The image depicts how a rhodium-catalyzed methodology leads to novel penta-spiro/fused-heterocyclic frameworks with potent antitumor activity through C-H activation/[4+1] and [4+2] annulation cascades. Read the full text of the article at 10.1002/chem. 202301553.PMID:37732554 | DOI:10.1002/chem.202302677
Source: Chemistry - September 21, 2023 Category: Chemistry Authors: Qi Liu Xuyi Liu Yazhou Li Yu Zhou Linxiang Zhao Xuewu Liang Hong Liu Source Type: research
Harnessing the Peterson Reaction for the Stereospecific Synthesis of Z-Vinyl Ethers
Chemistry. 2023 Sep 21:e202302708. doi: 10.1002/chem.202302708. Online ahead of print.ABSTRACTVinyl ethers are valuable synthetic intermediates which are also found as natural products, including aflatoxins, rifamycins and plasmalogens. The latter are ubiquitous phospholipids in human cells and contain a vinyl ether moiety with specifically Z configuration. Although numerous methods are available for synthesis of vinyl ethers, there is a lack of methods for obtaining Z isomers of molecules of the type RCH=CHOR' that are applicable to plasmalogens. A variant of the Peterson reaction is described that generates such molecule...
Source: Chemistry - September 21, 2023 Category: Chemistry Authors: Jay Tromans Bian Zhang Bernard Thomas Golding Source Type: research
Multigram Synthesis of Dimethyl Stellane-1,5-Dicarboxylate as a Key Precursor for the ortho-Benzene Mimics
Chemistry. 2023 Sep 20:e202302454. doi: 10.1002/chem.202302454. Online ahead of print.ABSTRACTHerein we present previously unavailable C(sp3)-rich polycyclic hydrocarbon scaffolds which have a potential to become valuable tools in medicinal chemistry and crop science as saturated bioisosteres of benzenoids. We have developed a scalable protocol (up to 50 g from a single synthetic run) for the synthesis of tricyclo[3.3.0.03,7]octane (bisnoradamantane or stellane) 1,5-dicarboxylic acid derivatives. X-ray crystallographic analysis of the stellane 1,5-dicarboxylic acid dimethyl ester has revealed that this scaffold is an optim...
Source: Chemistry - September 21, 2023 Category: Chemistry Authors: Oleh K Smyrnov Kostiantyn P Melnykov Eduard B Rusanov Sergey Yu Suikov Olexandr E Andrey A Fokin Dmytro M Volochnyuk Serhiy V Ryabukhin Source Type: research
Diversification of Carbodicarbene Class by Embedding an Anionic Component in its Scaffold
We report the synthesis of the first anionic CDC pincer Pd complexes containing a BF2 moiety within the framework, a charge-frustration zwitterion approach to leverage the electronic feature of carbon(0)/carbone, which is unprecedented. The elucidation of X-ray crystal structures, ligand competition as well as transmetallation experiments suggest that the anionic moiety has enhanced the overall donor strength of the traditional neutral CDC. Importantly, this anionic scaffold exhibits a facile second coordination toward Au(I), Ag(I) and Pd(II) without any external ligand assistance, whereas previously reported neutral pince...
Source: Chemistry - September 21, 2023 Category: Chemistry Authors: Cheng-Han Yu Ka-Chun Au-Yeung Ruiqin Liu Chao-Hsien Lee Dandan Jiang Bamlaku Semagne Aweke Chia-Hung Wu Yu-Jou Wang Ting-Hsuan Wang Kien Voon Kong Glenn P A Yap Wen-Ching Chen Gernot Frenking Lili Zhao Tiow-Gan Ong Source Type: research
Chiral-at-Metal Racemization Unraveled for MX2(a-chel)2 by means of a Computational Analysis of MoO2(acnac)2
Chemistry. 2023 Sep 20:e202302516. doi: 10.1002/chem.202302516. Online ahead of print.ABSTRACTOctahedral chiral-at-metal complexes MX2(a-chel)2 (a-chel = asymmetric chelate) can rearrange their ligands by four mechanisms known as the Bailar (B), Ray-Dutt (RD), Conte-Hippler (CH), and Dhimba-Muller-Lammertsma (DML) twists. Racemization involves their interconnections, which were computed for MoO2(acnac)2 (acnac = β-ketoiminate) using density functional theory at ωB97x-D with the 6-31G(d,p) and 6-311G(2d,p) basis sets and LANL2DZ for molybdenum. Racemizing the cis(NN) isomer, being the global energy minimum with trans orie...
Source: Chemistry - September 21, 2023 Category: Chemistry Authors: George Dhimba Alfred Muller Koop Lammertsma Source Type: research
Green approach for the synthesis of chalcogenyl-2,3-dihydrobenzofuran derivatives through allyl-phenols/naphthols and their potential as MAO-B inhibitors
Chem Asian J. 2023 Sep 21:e202300586. doi: 10.1002/asia.202300586. Online ahead of print.ABSTRACTThis work presents the design, synthesis, and MAO-B inhibitor activity of a series of chalcogenyl-2,3-dihydrobenzofurans derivatives. Using solvent- and metal-free methodology, a series of chalcogen-containing dihydrobenzofurans 7-9 was obtained with yields ranging from 40% to 99%, using an I2/DMSO catalytic system. All compounds were fully structurally characterized using 1H and 13C NMR analysis, and the unprecedented compounds were additionally analyzed using high-resolution mass spectrometry (HRMS). In addition, the mechanis...
Source: Chemistry, an Asian Journal - September 21, 2023 Category: Chemistry Authors: Amanda R Azevedo P âmella Cordeiro Dianer N Strelow Karine N de Andrade Marcos R S Neto Rodolfo Goetze Fiorot C ésar A Brüning Antonio L Braga Luciano M Li ão Cristiani F Bortolatto Jos é S S Neto Vanessa Nascimento Source Type: research
Rational Design of Tunable Near-Infrared Oxazine Probes with Large Stokes Shift for Leucine Aminopeptidase Detection and Imaging
Chem Asian J. 2023 Sep 21:e202300701. doi: 10.1002/asia.202300701. Online ahead of print.ABSTRACTNear-Infrared (NIR) fluorescence imaging with the advantages of deep tissue penetration and minimum background, has been widely employed and developed in the study of biological applications. However, small Stokes shifts, difficulty in optical tuning, and pH sensitivity are still the major limitations faced by current NIR dyes. To solve these problems, we rationally designed a pH insensitive amino-tunable NIR oxazine fluorophore DQF-NH2, which exhibited large Stokes shift (125 nm) accompanied with NIR excitation/emission due to...
Source: Chemistry, an Asian Journal - September 21, 2023 Category: Chemistry Authors: Haiyan Li Yang Shen Zhengkun Dong Wei Li Lin Yuan Source Type: research
Photo-Induced Carbonylation of Aryl Bromides for the Synthesis of Aryl Esters and Amides under Transition Metal-Free Conditions
Chem Asian J. 2023 Sep 20:e202300766. doi: 10.1002/asia.202300766. Online ahead of print.ABSTRACTIn this work, we developed a photo-induced carbonylation of aryl bromides under transition metal-free conditions. The reaction shows good activity with alcohol and amine nucleophiles. Various esters and amides were formed from aryl halides and alcohols and amines under mild conditions in moderate to good yields.PMID:37730903 | DOI:10.1002/asia.202300766
Source: Chemistry, an Asian Journal - September 21, 2023 Category: Chemistry Authors: Yan Zheng Bing-Hong Teng Youcan Zhang Xiao-Feng Wu Source Type: research
