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Amshumali M.K.,Vijayanagara Sri Krishnadevaraya University | Arancibia V.,University of Santiago de Chile | Manriquez J.M.,University of Santiago de Chile | Chavez I.,University of Santiago de Chile
Canadian Journal of Chemistry | Year: 2013

A new fused ring compound, 2,6-dibutyl-4,8-dimethyl-1,5-dihydro-s-indacene (VII) (H2L), has been synthesized from 2,5-dimethyl-1,4- dibromomethylbenzene in almost quantitative yield. Two organomtallic binuclear complexes, [CpFe-L-FeCp] (1) and the mixed-valence compound [CpFe-L-FeCp] + BF- 4 (2), have been characterized by spectroscopic and electrochemical techniques. The cyclic voltammogram of 1 exhibits a potential difference of 668 mV between two redox peaks and the UV-vis-NIR spectra of compound 2 shows an intervalance charge transfer band at 1794 nm. The information gathered by these techniques indicates that the studied binuclear complex has strong interaction between the two metal centres. © 2013 Published by NRC Research Press. Source

Mungalimane A.,Vijayanagara Sri Krishnadevaraya University
Bulletin of the Chemical Society of Ethiopia | Year: 2014

Efficient synthesis of novel 6-(2-bromo-2-methyl propanoyloxy)hexyl phosphonic acid, dodecane di-phosphonic acid, 6-(thiophene-3-carbonyloxy)hexyl phosphonic acid, octadecyl phosphonic acid and such other derivatives are reported here. These derivatives have a potential application as tethers to nanoparticle surfaces that can promote efficient electron transfer process in solar energy conversion. © 2014 Chemical Society of Ethiopia. Source

Tan C.,Shaanxi Normal University | Zhu G.,Shaanxi Normal University | Hojamberdiev M.,Tokyo Institute of Technology | Lokesh K.S.,Vijayanagara Sri Krishnadevaraya University | And 4 more authors.
Journal of Hazardous Materials | Year: 2014

In this study, the doping effect of samarium on the structure, morphology, adsorption and photocatalytic performance of hexagonal ZnIn2S4 microspheres was studied. The photocatalytic activity of Sm-doped ZnIn2S4 microspheres was evaluated for the photodegradation of Rhodamine B (RhB) and methyl orange (MO) under visible light irradiation. The samples were characterized by XRD, SEM, XPS, UV-vis, TEM, and N2 adsorption-desorption analysis. The results show that the hexagonal ZnIn2S4 microspheres are composed of nanoplates growing along c-axis with the predominant negative-charged S plane. Compared with the photodegadation of MO dye, the negative-charged {0001} facets not only are beneficial for the adsorption of RhB by -N(Et)2 groups but also can accumulate the separation of photogenerated electrons and holes, enhancing photodegradation efficiency by direct-hole photocatalysis. Moreover, Sm is partially substituted for In in the crystal lattice for forming the doping energy level which promotes the separation of photoinduced electron-hole pairs and enhances absorption of visible light. Hexagonal 2% Sm-doped ZnIn2S4 microspheres with exposed {0001} facets resulted in higher photodegradation efficiency of RhB under visible light irradiation. © 2014. Source

Lokesh K.S.,Vijayanagara Sri Krishnadevaraya University | Adriaens A.,Ghent University
Dyes and Pigments | Year: 2015

The formation of a supramolecular electropolymerized film of a polymeric palladium phthalocyanine on a glassy carbon electrode is reported here. The film was obtained by cycling monomeric palladium tetraaminephthalocyanine in dimethyl sulfoxide in the potential range -0.5 to +1.0 V. The functionalized polymerized film on the electrode was characterized using Raman spectroscopy, X-ray photoelectron spectroscopy and electrochemical methods. A polymeric phthalocyanine film was shown to form by the oxidation of peripheral amino groups. It uniformly and completely covered the electrode surface. The modified electrode surface slightly blocked the reversible redox behavior of a redox probe owing to the thick polymeric film on its surface. The modified electrode showed a redox capacitance of 146 F g-1 at 0.27 V in 0.5 M sulfuric acid. © 2014 Elsevier Ltd. All rights reserved. Source

Liu Q.,Shinshu University | Lokesh K.S.,Shinshu University | Lokesh K.S.,Vijayanagara Sri Krishnadevaraya University | Chauvin C.,Shinshu University | Sugimoto W.,Shinshu University
Journal of the Electrochemical Society | Year: 2014

Model electrodes consisting of ruthenium oxide nanosheets coated on freshly cleaved highly oriented pyrolytic graphite (RuO2 nanosheet/HOPG) were prepared to investigate the electrostatic interactions between RuO 2 nanosheets and electrochemically dissolved Pt ions. The RuO 2 nanosheet/HOPG model electrode was dipped into a solution containing dissolved Pt ions generated by potential cycling a Pt working electrode in sulfuric acid electrolyte. Scanning tunneling microscopy revealed preferential adsorption of Pt ions on the nanosheets as island-like deposits, while no such deposits were observed on HOPG. This shows the strong electrostatic interactions between the positively-charged Pt ions and negatively-charged nanosheet. The calculated amount of Pt ions adsorbed was 0.93 x 106 atoms (im 2, which agreed with the theoretical saturated adsorption amount of Pt ion on RuO2 nanosheet of 0.96 x 106 atoms ( m 2 . All of the Pt ions could be electrochemically reduced to Pt nanoparticles showing activity toward the oxygen reduction reaction. © 2013 The Electrochemical Society. All rights reserved. Source

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