Synthesis and Characterization of 2,5-bis[(3,4-ethylenedioxy)thien-2-yl]-3-Substituted Thiophenes

2002 ◽  
Vol 736 ◽  
Author(s):  
Michael F. Pepitone ◽  
Kalya Eaiprasertsak ◽  
Stephen S. Hardaker ◽  
Richard V. Gregory
Keyword(s):  
Cyclic Voltammetry ◽  
Quantum Yield ◽  
Electrochemical Behavior ◽  
Electronic Device ◽  
Blue Emission ◽  
Synthesis And Characterization ◽  
Emission Characteristics ◽  
Potential Cycling ◽  
Device Applications

ABSTRACTSynthesis and functionalization of 3-bromothiophene afforded novel 2,5-bis[(3,4-ethylenedioxy)thien-2-yl]-)-3-substituted thiopehene monomers with blue emission characteristics and having a quantum yield of 3–5%. Cyclic voltammetry was employed to investigate the electrochemical behavior of the four monomers reported here. Polymer films were deposited by repeated potential cycling. These materials are considered for use in tailoring properties in opto-electronic device applications.

Electrochemical and photophysical characterization of non-peripherally-octaalkyl substituted dichlorotin(IV) phthalocyanine and tetrabenzotriazaporphyrin compounds

2007 ◽  
Vol 11 (10) ◽  
pp. 761-770 ◽  
Author(s):  
Samson Khene ◽  
Andrew N. Cammidge ◽  
Michael J. Cook ◽  
Tebello Nyokong
Keyword(s):  
Cyclic Voltammetry ◽  
Quantum Yield ◽  
Triplet State ◽  
Electrochemical Behavior ◽  
Heavy Atom ◽  
Quantum Yields ◽  
Redox Processes ◽  
Central Metal ◽  
Atom Effect

Three non-peripherally substituted tin(IV) macrocylic compounds, octahexylphthalocyaninato dichlorotin(IV) (3a), octahexyltetrabenzo-5,10,15- triazaporphyrinato dichlorotin(IV) (3b) and octadecylphthalocyaninato dichlorotin(IV) (3c) were synthesized and their photophysical and electrochemical behavior studied. Complex 3b, containing a CH group in place of one of the aza nitrogen atoms of the phthalocyanine core, shows a split Q-band due to its lower symmetry. The triplet state quantum yields were found to be lower than would be expected on the basis of the heavy atom effect of tin as the central metal for phthalocyanine derivatives (3a and 3c). In contrast, 3b shows a triplet quantum yield Φ T = 0.78. The triplet state lifetimes were solvent dependent, and were higher in tetrahydrofuran than in toluene. Cyclic voltammetry and spectroelectrochemistry of the complexes revealed only ring-based redox processes.

Synthesis and characterization of novel functionalized perarylated polysiloxane for proton exchange membrane fuel cells

MRS Advances ◽  
2019 ◽  
Vol 4 (64) ◽  
pp. 3579-3585
Author(s):  
Guillermo M. González Guerra ◽  
Alejandro Alatorre-Ordaz ◽  
Gerardo González Garcia ◽  
Jesus S. Jaime-Ferrer
Keyword(s):  
Cyclic Voltammetry ◽  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Area Under The Curve ◽  
Chlorosulfonic Acid ◽  
Proton Exchange ◽  
Synthesis And Characterization ◽  
A Value ◽  
Exchange Membrane

ABSTRACTThis work presents the synthesis and characterization of a pearylated polysiloxane material (PAP) from a polycondensation reaction, followed by functionalization with HClSO3 by an electrophilic substitution reaction. According to the characterization techniques applied, a sulfonated pearylated polysiloxane was also obtained, (SPAP). The purpose of this sulfonated material is to obtain an ionomer able to be applied in hydrogen fuel cells of the proton exchange membrane kind (PEMFC). The reaction to produce the polysiloxane precursor was carried out with the commercial reagents: PhSiCl3, Ph2SiCl2 and Ph3SiCl in anhydrous THF at 75 °C and the SPAP material was obtained by sulfonation of the precursor with chlorosulfonic acid. PAP and SPAP were characterized by 1H, NMR for liquids, 29Si NMR for solids, IR-ATR, SEM, and cyclic voltammetry. The NMR 29Si spectra show that PAP and PAPS contain crosslinking regions due to PhSiCl3, growing chain zones due to Ph2SiCl2 and polymer termination zones due to Ph3SiCl, obtaining a mixture of siloxanes. The analysis by cyclic voltammetry indicates that by integrating the area under the curve of the adsorption peaks of H2, a value of 0.062 mC/cm2 is obtained, a value close to the commercial ionomer of Nafion®.

Synthesis and Characterization of a Methanofullerene-4-Fluoro-α-Cyanostilbene Dyad as a Potential Acceptor for Organic Solar Cells

2015 ◽  
Vol 1784 ◽  
Author(s):  
Venkata Neti
Keyword(s):  
Mass Spectrometry ◽  
Cyclic Voltammetry ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Synthesis And Characterization ◽  
Lumo Energy ◽  
Homo Lumo ◽  
Aryl Ester

ABSTRACTA series of fluorine appended highly conjugated fullerenes were prepared containing fluoro-α-cyanostilbene and aryl ester units. These modified PCBM dyads are fully characterized by NMR, Mass spectrometry, UV-vis, and cyclic voltammetry (Figures 1-4). It was found that the presence of fluoro-α-cyanostilbenes and esters affects the cyclic voltammetry and absorption in the UV-Vis region. The PCBA modified fullerenes significantly influences the HOMO-LUMO energy and wide absorption compared to PCBM.

scholarly journals Synthesis and characterization of CdSxSe1−xalloy quantum dots with composition-dependent band gaps and paramagnetic properties

RSC Advances ◽  
2018 ◽  
Vol 8 (52) ◽  
pp. 30002-30011 ◽  
Author(s):  
Yueh-Chi Chung ◽  
Chien-Hsin Yang ◽  
Hao-Wen Zheng ◽  
Ping-Szu Tsai ◽  
Tzong-Liu Wang
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Fluorescence Intensity ◽  
Band Gaps ◽  
Synthesis And Characterization ◽  
Paramagnetic Properties

Both the fluorescence intensity and quantum yield of all the nanocrystals are much enhanced after the CdSxSe1−xQD cores are coated with a ZnS shell.

Electrochemically Synthesis and Characterization of Copolymers Based on 1, 4-Diethoxybenzene and 3, 4-Ethylenedioxythiophene

2011 ◽  
Vol 335-336 ◽  
pp. 989-993
Author(s):  
Mi Ouyang ◽  
Zhen Wei Yu ◽  
Yi Xu ◽  
Yu Jian Zhang ◽  
Cheng Zhang
Keyword(s):  
Cyclic Voltammetry ◽  
Ir Spectroscopy ◽  
Feed Ratio ◽  
Synthesis And Characterization ◽  
Monomer Mixture ◽  
Long Wavelength ◽  
H Nmr ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Copolymers based on 1, 4-diethoxybenzene (DEB) and 3, 4-ethylenedioxythiophene (EDOT) were electrochemically synthesized and characterized. The structures of the copolymers were established by 1H NMR and FT-IR spectroscopy. The results indicated the final product was a copolymer instead of a blend or a composite. The physical properties were systematically investigated by cyclic voltammetry, UV-vis absorption and fluorescence. The PL maximum of copolymers presented obviously red-shift to long wavelength as the feed ratio of EDOT in monomer mixture increased.

scholarly journals Synthesis and characterization of a fluorinated S-nitrosothiol as the nitric oxide donor for fluoropolymer-based biomedical device applications

2018 ◽  
Vol 6 (38) ◽  
pp. 6142-6152 ◽  
Author(s):  
Yang Zhou ◽  
Qi Zhang ◽  
Jianfeng Wu ◽  
Chuanwu Xi ◽  
Mark E. Meyerhoff
Keyword(s):  
Nitric Oxide ◽  
Polyvinylidene Fluoride ◽  
Nitric Oxide Donor ◽  
Synthesis And Characterization ◽  
No Donor ◽  
Fluorinated Polymer ◽  
Biomedical Device ◽  
Device Applications

The first nitric oxide (NO) releasing fluorinated polymer was developed via incorporating a new fluorinated NO donor into polyvinylidene fluoride tubing.

Microwave Synthesis and Characterization of Nanoscale Lanthanum Cobaltite

2012 ◽  
Vol 476-478 ◽  
pp. 1322-1326
Author(s):  
Xiao Yu Jiang ◽  
Jin Chen ◽  
Wen Zhe Chen
Keyword(s):  
Cyclic Voltammetry ◽  
Steady State ◽  
Microwave Irradiation ◽  
Reaction Order ◽  
Synthesis And Characterization ◽  
Cyclic Voltammogram ◽  
Lanthanum Cobaltite ◽  
Bet Analysis ◽  
Perovskite Type

Nanoscale lanthanum cobaltite with perovskite-type was successfully synthesized by microwave irradiation directly and was characterized by XRD, SEM, XPS and BET analysis. The results show that the size of particle was 18 nm averagely, the surface area to be 31.0 m2 g−1. The electrochemical properties were studied by cyclic voltammetry and steady state polarization. The cyclic voltammogram between 0 and 0.55 V exhibited two pairs of redox peaks prior to the onset of O2 evolution in 1 mol dm−3 KOH. The Tafel slope and the reaction order with respect to concentration of OH− were found to be 60 mV decade−1 and ca. 1, respectively.

Synthesis and Characterization of New Polyaryleneethynylenes based on 3-Hexyl Multisubstituted Oligothiophene Blocks

1999 ◽  
Vol 598 ◽  
Author(s):  
Silvia Destri ◽  
William Porzio ◽  
Irina A. Khotina ◽  
Chiara Botta ◽  
Roberto Consonni
Keyword(s):  
Quantum Yield ◽  
Synthesis And Characterization ◽  
Model Compounds ◽  
Large Molecules ◽  
Photoluminescence Quantum Yield ◽  
Nmr Characterization

ABSTRACTA series of new regioregular polyaryleneethynylene obtained by condensation of 3-hexyl multisubstituted oligothiophene derivatives with benzene and anthracene compounds were prepared. A complete NMR characterization of the starting monomers and model compounds lead to a deep investigation of the corresponding macromolecules. Both small and large molecules were optically characterized, the former, particularly when containing anthracene, moieties display noticeable photoluminescence quantum yield. In the polymers the photoluminescence quantum yield is lower than that of the starting molecules when anthracene is present, while the polymers containing benzene are more luminescent.

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