Excited-state investigations of meso-mono-substituted-(amino-ferrocenyl)porphyrins: Experimental and theoretical approaches

Publication date: Available online 23 August 2019Source: Journal of Photochemistry and Photobiology A: ChemistryAuthor(s): Leandro H.Z. Cocca, Lucas F. Sciuti, Lucas B. Menezes, Mateus H. Köhler, Andressa C. Bevilacqua, Paulo C. Piquini, Bernardo A. Iglesias, Leonardo de BoniAbstractThe spectroscopic study and characterization of mono-(amino-ferrocenyl) porphyrins has increased during the last years. These molecules can be synthesized in such a way that their linear and nonlinear optical parameters are modulated, opening the possibility for new applications, such as in photodynamic therapy. In this work, we perform a spectroscopic characterization of a group of five free-base porphyrins, three of them having a C6F4 group attached to an amino-ferrocene moiety through a -NH(CH2)nNH- spacer, in which n = 2, 4 or 6. These three molecules differ by the size of the aliphatic chain. For this study, we employ linear as well as nonlinear optical spectroscopic techniques, such as the Z-Scan and time resolved fluorescence. Decay times, absorption cross-sections and quantum yields were determined, and the results suggest that, for this group of molecules, the differences in the aliphatic chain sizes joining the ferrocenyl unit to the C6F4 group at the para-position aryl ring do not influence significantly the optical parameters. Further, DFT calculations confirm that the UV-vis absorbance and the associated electronic transitions are not affected by the size of the ali...
Source: Journal of Photochemistry and Photobiology A: Chemistry - Category: Chemistry Source Type: research

Related Links:

Authors: Tsai YC, Lee HL, Kuo CC, Chen CY, Hsieh KL, Wu MH, Wen YC, Yu HW, Hsu FC, Tsai JT, Chiou JF Abstract Background: Magnetic resonance-guided focused ultrasound surgery (MRgFUS) is an alternative local therapy for patients with painful bone metastasis. However, little is known about the prognostic and predictive factors of MRgFUS in treating bone metastasis. Materials and methods: This retrospective study analyzed the performance status, treated site, pretreatment pain score, pretreatment tumor volume and lesion coverage volume factor (CVF) of 31 patients who underwent MRgFUS. A numerical rating scale for pai...
Source: International Journal of Hyperthermia - Category: Internal Medicine Tags: Int J Hyperthermia Source Type: research
Publication date: Available online 19 September 2019Source: Physica E: Low-dimensional Systems and NanostructuresAuthor(s): A. Nallathambi, A. Prakasam, R. Azhagu RajAbstractAt ambient temperature, manganese oxide (undoped) as well as a variety of Cr doped Mn3O4, CrxMn3O41−x (x = 0.01, 0.02 and 0.03) hexagonal-like particles have been synthesized by employing a microwave synthesis approach. The synthesized samples properties were known by various instrumental techniques, for instance, XRD (X-ray diffraction), TEM and SEM (transmission and scanning electron microscopy), optical absorption and photoluminescence (PL...
Source: Physica E: Low dimensional Systems and Nanostructures - Category: Nanotechnology Source Type: research
Medgadget has previously reported on Abbott’s FreeStyle Libre 14 day system, most recently when we interviewed them at CES 2019. The company has aimed to help people with diabetes move away from traditional fingerstick testing towards continuou...
Source: Medgadget - Category: Medical Devices Authors: Tags: Exclusive Medicine Source Type: blogs
Publication date: Available online 18 September 2019Source: Materials Today CommunicationsAuthor(s): Nandini A. Pattanashetti, Sara Biscaia, Carla Moura, Geoffrey R. Mitchell, Mahadevappa Y. KariduraganavarAbstractDevelopment of three-dimensional (3D) scaffolds has acquired a great importance for bone repair and tissue reconstruction. Thus, this paper addresses the development of 3D scaffolds by varying the content of silicon dioxide (SiO2) in polycaprolactone (PCL) matrix. The scaffolds were fabricated by employing a novel fused deposition modelling technique (BioExtruder). The physicochemical properties of the developed ...
Source: Materials Today Communications - Category: Materials Science Source Type: research
Publication date: Available online 19 September 2019Source: Materials LettersAuthor(s): V.N. Rogozhnikov, D.I. Potemkin, N.V. Ruban, V.A. Shilov, A.N. Salanov, A.V. Kulikov, P.A. Simonov, E.Y. Gerasimov, V.A. Sobyanin, P.V. SnytnikovAbstractFront and end zones of Rh/Ce0.75Zr0.25O2–δ-ƞ-Al2O3/FeCrAl wire mesh catalytic module were studied by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) techniques after more than 250 h on stream under hydrocarbon fuels steam (SR) and autothermal reforming (ATR) conditions. Catalyst coking by fibrous carbon growth under diesel ATR conditions was co...
Source: Materials Letters - Category: Materials Science Source Type: research
Publication date: Available online 16 September 2019Source: Materials LettersAuthor(s): Masaki Tahara, Tomonari Inamura, Hee Young Kim, Shuichi Miyazaki, Hideki HosodaAbstractThe isothermal martensitic transformation (IMT) behavior of Ti–20Nb–0.7O (mol %) alloy was investigated via X-ray diffractometry. Isothermal formation of the α′′ martensite phase was observed, and the activation energy was determined using the time–temperature–transformation diagram coupled with differential scanning calorimetry. IMT in Ti-20Nb-0.7O alloy was explained by nanometer-sized local lattice modulati...
Source: Materials Letters - Category: Materials Science Source Type: research
Publication date: Available online 20 September 2019Source: Materials Chemistry and PhysicsAuthor(s): Song-Ho Wang, Hsueh-Er Chang, Chien-Chieh Lee, Yiin-Kuen Fuh, Tomi T. LiAbstractPlasma Enhanced Chemical Vapor Deposition (PECVD) has been used for direct production of wafer-equivalent quality silicon thin film solar cells, includes the nc-Si:H deposition film. In this paper, the nano-crystalline silicon thin films were deposited on Si substrate by PECVD from source gas of trichlorosilane (TCS, SiHCl3) at temperatures 400 °C. The in-situ plasma monitoring and the resultant deposited film properties of the a-Si:H ...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
Publication date: Available online 19 September 2019Source: Journal of Materials Science &TechnologyAuthor(s): B. Munirathinam, J.P.B. van Dam, A. Herrmann, W.D. van Driel, F. De Buyl, S.J.F. Erich, L.G.J. van der Ven, O.C.G. Adan, J.M.C. MolAbstractIn general, packaging materials which encapsulate light emitting diodes (LEDs) and microelectronic devices offer barrier protection against several environmental hazards such as water and ionic contaminants. However, these encapsulants may provide pathways for water and ionic contaminants to reach the metal/polymer interfaces and provoke local corrosion of electronics, whic...
Source: Journal of Materials Science and Technology - Category: Materials Science Source Type: research
Publication date: Available online 19 September 2019Source: Journal of Materials Science &TechnologyAuthor(s): Mir Ghasem Hosseini, Pariya Yardani Sefidi, Ahmet Musap Mert, Solen KinayyigitAbstractThe camphor sulfonic acid doped polyaniline-WO3-multiwall carbon nanotube (CSA PANI-WO3-CNT) ternary nanocomposite was synthesized during in-situ oxidative polymerization and characterized by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM), and Energy-...
Source: Journal of Materials Science and Technology - Category: Materials Science Source Type: research
Publication date: Available online 19 September 2019Source: Journal of Materials Science &TechnologyAuthor(s): Bianca Lucas-Granados, Rita Sánchez-Tovar, Ramón M. Fernández-Domene, José María Estívalis-Martínez, José García-AntónAbstractIron oxide nanostructures are promising materials to be used as photocatalysts in different photoelectrochemical applications. There are different techniques in order to synthesize these nanostructures, but one of the most inexpensive and simple method is electrochemical anodization. This method can lead to different ...
Source: Journal of Materials Science and Technology - Category: Materials Science Source Type: research
More News: Chemistry | Men | PET Scan | Study