Author
Shrinkhala Dwivedi
Bio: Shrinkhala Dwivedi is an academic researcher from University of Lucknow. The author has contributed to research in topics: Substitution reaction & Heritability. The author has an hindex of 5, co-authored 7 publications receiving 38 citations.
Papers
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TL;DR: The first Te-C cleaved product was obtained in the reaction of C4H8TeI2 (1,2,3,4,5,6-hexahydro-1,1-diiodotellurophene) with NH4S2CNHC6H5 (ammonium aniline dithiocarbamate) as mentioned in this paper.
12 citations
TL;DR: In this paper, it was shown that the substitution reaction of C 5 H 10 TeCl 2 with NH 4 S 2 CNHC 6 H 5 yields complex, along with the cleaved product SC(NHC 6H 5 ) 2.
10 citations
TL;DR: In this article, a convenient route to the synthesis of the first bis(ferrocenyl carboxylato) telluranes has been developed, and the X-ray structure of 3 shows that it contains a tellurium heterocycle (C5H10Te), present in a chair conformation, sandwiched between two ferrocene units with carboxyate groups acting as spacers.
Abstract: A convenient route to the synthesis of the first bis(ferrocenyl carboxylato) telluranes has been developed. Reactions of 1,1,2,3,4,5,6-heptahydro-1,1-(dihydroxo)tellurane and 1,1,2,3,4,5-hexahydro-1,1-(dihydroxo)tellurophene with ferrocene carboxylic acid give 1,1,2,3,4,5,6-heptahydro-1,1-bis(ferrocenyl carboxylato)tellurane (3) and 1,1,2,3,4,5,-hexahydro-1,1-bis(ferrocenyl carboxylato)tellurophene (5), respectively. The X-ray structure of 3 shows that it contains a tellurium heterocycle (C5H10Te), present in a chair conformation, sandwiched between two ferrocene units with carboxylate groups acting as spacers. Compound 3 also exhibits modest second harmonic generation (SHG) efficiency. The electrochemical studies of 3 and 5 through cyclic voltammetry show only one oxidation wave, indicating the presence of independent redox centers leading to reversible single-step two-electron redox systems.Key words: tellurane, ferrocenylcarboxylate, SHG efficiency, electrochemistry.
6 citations
TL;DR: The X-ray structures of some of these organotellurium (IV) derivatives indicate that they possess ψTBP geometry and dimeric and tetrameric supramolecular associations as discussed by the authors.
5 citations
TL;DR: In this article, the supramolecular assemblies of organotellurium(IV) dithiocarbamates, formed through intermolecular Te⋯S secondary bonds, intermolescular Te ⋯X (X = I, S) secondary bonds and C-H⋽O hydrogen bonds are described.
5 citations
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TL;DR: In this paper, an electrical ball milling technique was used for the synthesis of 49 different thiourea derivatives using powder X-ray diffraction aided by solid-state NMR spectroscopy.
81 citations
TL;DR: In this paper, the nonlinear optical properties of CdSe quantum dots and Au-CdSe heteronanostructures were investigated by using a Z-scan technique at 532 nm picosecond laser pulses, and 800 nm femtosecond (FemTosecond) laser pulses.
Abstract: The metal–semiconductor heterostructures have recently emerged as a new class of functional materials for their potential applications due to plasmon-exciton interactions. Here, we demonstrate the nonlinear optical switching and enhanced nonlinear optical response of Au–CdSe heterostructures. The nonlinear optical properties of CdSe quantum dots and Au–CdSe heteronanostructures are investigated by using a Z-scan technique at 532 nm picosecond laser pulses, and 800 nm femtosecond laser pulses. Interestingly, we observe switching behavior from saturable absorption (SA) to reverse saturable absorption (RSA) with increasing laser intensity. The effective two-photon absorption cross section (σeff) of Au–CdSe heteronanostructures is greatly enhanced which is attributed to charge transfer between CdSe and Au nanoparticles. The nonlinear refraction changes its sign from positive to negative nonlinearity at higher intensities for Au–CdSe heterostructures. Third order nonlinear optical susceptibility is being measu...
78 citations
TL;DR: In this article, a survey of the literature of tellurium(II)/(IV) 1,1-dithiolates (dithiocarbamate, xanthate, dithiophosphate, or dithIophosphinate) is presented.
44 citations
Journal Article•
TL;DR: In this article, le composition 1 cristallise dans le groupe P2 1 /c (Affinement jusqu'a R=0.022), le second dans P1 (R=0,042) and le troisieme dins P2 (R = 0,037) was presented.
Abstract: Le compose 1 cristallise dans le groupe P2 1 /c (Affinement jusqu'a R=0,022), le second dans P1 (R=0,042) et le troisieme dans P1 (R=0,037). Les trois composes ont une geometrie pseudo bipyramidale trigonale; ils forment des liaisons secondaires pour donner des systemes plan pentagonaux autour de Te et de I
42 citations
TL;DR: The chalcogen bond (ChB) is defined as a noncovalent interaction between the electron density deficient region (so-called as σ or π hole) of a covalently-bonded atom and a nucleophilic (Nu) site in the same (intramolecular) or another molecular entity as mentioned in this paper .
32 citations