The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Jean Roncali - One of the best experts on this subject based on the ideXlab platform.
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an attempt to synthesize a terthienyl based analog of indacenediThiophene idt unexpected synthesis of a naphtho 2 3 b Thiophene Derivative
RSC Advances, 2021Co-Authors: Cătălin C Anghel, Ioan Stroia, Alexandra Pop, Atilla Bende, Ion Grosu, Niculina D Hădade, Jean RoncaliAbstract:We report herein our attempt to synthesize an analog of indacenediThiophene (IDT) based on a tetraphenylhexyl substituted, covalently bridged syn-terthienyl unit. Instead of the expected compound the adopted synthetic route led to the formation of an unexpected, new naphtho[2,3-b]Thiophene Derivative. The structure of this compound was fully characterized by NMR and HRMS as well as single crystal X-ray diffraction and its electronic properties have been analyzed by UV-vis absorption spectroscopy and cyclic voltammetry. A possible mechanism for the formation of this compound is also proposed on the basis of detailed theoretical investigations.
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design synthesis and electrochemical properties of a Thiophene Derivative functionalized with a siderophore like chelator
Journal of Electroanalytical Chemistry, 2009Co-Authors: Fabrice Moggia, Frederic Fages, Hugues Brisset, Carole Chaix, Bernard Mandrand, Eric Levillain, Jean RoncaliAbstract:A hybrid 3,4-ethylenedioxyThiophene (EDOT)-Thiophene precursor functionalized with an hydroxypyridinone group has been synthesized and electropolymerized into the corresponding polymer. The analysis of the dependence of the open circuit potential (OCP) of the modified electrode on the concentration of Fe3+ in aqueous solution shows that metal binding to the hydroxypyridinone groups prevents the oxidation of the conjugated polymer backbone until a threshold determined by the occupancy of the available complexation sites of the functionalized polymer is reached.
Devarapaga Madhu - One of the best experts on this subject based on the ideXlab platform.
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synthesis and evaluation of stearic acid based heterocyclic schiff bases as biolubricant additives in epoxy karanja fatty acid 2 ethyl hexyl esters base oil
Industrial Crops and Products, 2021Co-Authors: Venkateshwarlu Kontham, K R Ansari, Korlipara V Padmaja, Devarapaga MadhuAbstract:Abstract Four novel stearic acid derived Schiff bases containing heterocyclic aromatic groups (furan, Thiophene, pyrrole and pyridine) were synthesized in a three step reaction procedure. All the products were characterized by FT-IR, NMR and ESI-MS. The lubricity and antioxidant properties of synthesized Schiff bases were evaluated with 4-ball machine and differential scanning calorimeter. The morphologies and composition of elements on the worn surfaces were studied by using scanning electron microscope and energy-dispersive X-ray spectroscopy. Results show that these stearic acid based Derivatives possess good tribological properties and antioxidant performance. The difference in the additive performance of the Derivatives is closely related to the difference in their molecular structure. Pyridine containing Schiff base was more effective as both antiwear and extreme pressure additive while Thiophene Derivative exhibited higher efficacy as antioxidant.
Namita Roy Choudhury - One of the best experts on this subject based on the ideXlab platform.
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sulfonated Thiophene Derivative stabilized aqueous poly 3 hexylThiophene phenyl c61 butyric acid methyl ester nanoparticle dispersion for organic solar cell applications
ACS Applied Materials & Interfaces, 2018Co-Authors: Surya Subianto, Rajkamal Balu, Liliana De Campo, Anna Sokolova, Naba K Dutta, Namita Roy ChoudhuryAbstract:Aqueous dispersions of poly(3-hexylThiophene):phenyl-C61-butyric acid methyl ester (P3HT:PCBM) nanoparticles (NPs) have been fabricated using a Thiophene-based surfactant 2-(3-thienyl)ethyloxybutylsulfonate sodium salt (TEBS) for the first time via the mini-emulsion process. The use of TEBS resulted in a stable colloidal dispersion of P3HT:PCBM NPs, of which the effect of various fabrication parameters is investigated. The fabricated NPs were characterized by dynamic light scattering, scanning electron microscopy, UV-visible spectroscopy, contrast-variation small and ultra-small angle neutron scattering, and cyclic voltammetry. The internal structure and electrochemical performance of TEBS-stabilized P3HT:PCBM NPs were compared to those of sodium dodecyl sulfate-stabilized core-shell (PCBM-P3HT) NPs at the same surfactant concentration. Neutron scattering and cyclic voltammetry results reveal a homogeneous distribution of small de-mixed P3HT and PCBM domains in the internal structure of TEBS-stabilized P3HT:PCBM NPs, reminiscent of cast film. Moreover, electron microscopy images show evidence of diffused NP surface/interface upon drying (without annealing), which indicates that the Thiophene-containing TEBS may improve compatibility and film-forming properties of fabricated P3HT:PCBM NPs, and consequently be more suited for conventional film-processing methods for organic solar cell applications.
Takayoshi Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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Ultrafast spectroscopy of poly-Thiophene Derivative by using sub-10 fs visible pulse
Conference on Lasers and Electro-Optics 2012, 2012Co-Authors: Atsushi Yabushita, Yu Hsien Lee, Chain-shu Hsu, Sheng-hsiung Yang, Chih-wei Luo, Takayoshi KobayashiAbstract:Ultrafast spectroscopy was performed for a poly(3-hexylThiophene) (P3HT) film changing pump power. The result clarified the femtosecond time constant for generation and relaxation of the bound polaron pair in the film.
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classification of dynamic vibronic couplings in vibrational real time spectra of a Thiophene Derivative by few cycle pulses
Journal of Physical Chemistry A, 2007Co-Authors: Takayoshi Kobayashi, Zhuan Wang, Tetsuo OtsuboAbstract:Pump-probe spectroscopy was performed with a few cycle pulses of 6.7 fs duration. The electronic transition intensity modulation was induced by molecular vibration in a quinoid Thiophene molecule in solution. The real-time vibrational features were analyzed in terms of dependence of vibrational amplitude and phase on probe photon energy. The electronic transition probability is modulated by molecular vibration via vibronic coupling. Changes in the spectral shape and intensity of the time-resolved spectrum were studied by tracking characteristic spectral features including the peak frequency and intensity, spectral bandwidth, and band-integrated intensity. From the analysis the modulation mechanisms were classified into two groups: (1) Condon type and (2) non-Condon type. The features of the wave packet motions were also classified into zeroth-order Derivatives due to quasi-pure non-Condon type and first- and second-order Derivative types due to the displacement of the potential minimum and the potential curvature change associated with the relevant vibronic transition, respectively.
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sub 5 fs spectroscopy of a Thiophene Derivative with a quinoid structure
Chemical Physics Letters, 2006Co-Authors: Takayoshi Kobayashi, Haibo Wang, Zhuan Wang, Tetsuo OtsuboAbstract:Abstract Sub-5-fs spectroscopy of a Thiophene Derivative with an electron donative and an acceptive moieties and quinoid structure provided the experimental evidence of dynamic mode coupling. It was shown that two out-of-plane bending modes mediate the dynamic mode coupling between 1469 and 1379 cm−1 and between 1603 and 1469 cm−1. These couplings are considered to be associated with geometrical relaxation relevant to the neutral bipolaron formation in all-s-trans polyacetylene.
Venkateshwarlu Kontham - One of the best experts on this subject based on the ideXlab platform.
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synthesis and evaluation of stearic acid based heterocyclic schiff bases as biolubricant additives in epoxy karanja fatty acid 2 ethyl hexyl esters base oil
Industrial Crops and Products, 2021Co-Authors: Venkateshwarlu Kontham, K R Ansari, Korlipara V Padmaja, Devarapaga MadhuAbstract:Abstract Four novel stearic acid derived Schiff bases containing heterocyclic aromatic groups (furan, Thiophene, pyrrole and pyridine) were synthesized in a three step reaction procedure. All the products were characterized by FT-IR, NMR and ESI-MS. The lubricity and antioxidant properties of synthesized Schiff bases were evaluated with 4-ball machine and differential scanning calorimeter. The morphologies and composition of elements on the worn surfaces were studied by using scanning electron microscope and energy-dispersive X-ray spectroscopy. Results show that these stearic acid based Derivatives possess good tribological properties and antioxidant performance. The difference in the additive performance of the Derivatives is closely related to the difference in their molecular structure. Pyridine containing Schiff base was more effective as both antiwear and extreme pressure additive while Thiophene Derivative exhibited higher efficacy as antioxidant.