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G. N. Mukherjee

Other affiliations: University of Reading
Bio: G. N. Mukherjee is an academic researcher from University of Calcutta. The author has contributed to research in topics: Denticity & Ligand. The author has an hindex of 13, co-authored 23 publications receiving 552 citations. Previous affiliations of G. N. Mukherjee include University of Reading.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a tridentate dibasic ONO donor hydrazone ligand derived from the condensation of benzoylhydrazine with either 2-hydroxyacetophenone or its para substituted derivatives (H2L1-4, general abbreviation H2L) has been used as primary ligands and 8-hydroxquinoline (Hhq, a bidentate monobasic OnO donor species) was used as auxiliary ligand.

88 citations

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TL;DR: This work has synthesized and characterized the first report of a structurally characterized 4,4'-bipyridine-bridged oxovanadium(V) binuclear complex, and it is found to possess a distorted square pyramidal structure.
Abstract: Reaction of the tridentate ONO Schiff-base ligand 2-hydroxybenzoylhydrazone of 2-hydroxybenzoylhydrazine (H2L) with VO(acac)2 in ethanol medium produces the oxoethoxovanadium(V) complex [VO(OEt)L] (A), which reacts with pyridine to form [VO(OEt)L.(py)] (1). Complex 1 is structurally characterized. It has a distorted octahedral O4N2 coordination environment around the V(V) acceptor center. Both complexes A and 1 in ethanol medium react with neutral monodentate Lewis bases 2-picoline, 3-picoline, 4- picoline, 4-amino pyridine, imidazole, and 4-methyl imidazole, all of which are stronger bases than pyridine, to produce dioxovanadium(V) complexes of general formula BH[VO2L]. Most of these dioxo complexes are structurally characterized, and the complex anion [VO2L]- is found to possess a distorted square pyramidal structure. When a solution/suspension of a BH[VO2L] complex in an alcohol (ROH) is treated with HCl in the same alcohol, it is converted into the corresponding monooxoalkoxo complex [VO(OR)L], where R comes from the alcohol used as the reaction medium. Both complexes A and 1 produce the 4,4'-bipyridine-bridged binuclear complex [VO(OEt)L]2(mu-4,4'-bipy) (2), which, to the best of our knowledge, represents the first report of a structurally characterized 4,4'-bipyridine-bridged oxovanadium(V) binuclear complex. Two similar binuclear oxovanadium(V) complexes 3 and 4 are also synthesized and characterized. All these binuclear complexes (2-4), on treatment with base B, produce the corresponding mononuclear dioxovanadium(V) complexes (5-10).

82 citations

Journal ArticleDOI
TL;DR: In this article, the ONO donor ligands are the acetylhydrazones of salicylaidehyde (H2L1) and 2-hydroxyacetophenone (H 2L2) (general abbreviation, H2L2).

67 citations

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TL;DR: Equilibrium study on the mixed-ligand complex formation of M2+ ions with alpha-d-(-)aminobenzyl penicillin popularly known as ampicillin and nucleic bases and stability constants of the ternary complexes.

52 citations

Journal ArticleDOI
TL;DR: A simple general route of obtaining very stable octacoordinated non-oxovanadium(IV) complexes of the general formula VL2 (where H2L is a tetradentate ONNO donor) is presented.
Abstract: A simple general route of obtaining very stable octacoordinated non-oxovanadium(IV) complexes of the general formula VL2 (where H2L is a tetradentate ONNO donor) is presented. Six such complexes (1...

48 citations


Cited by
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Journal ArticleDOI
TL;DR: Assay on the cytotoxicity of Co, Ni and Cu hydrazone complexes against HeLa tumor cells and NIH 3T3 normal cells revealed that the complexes are toxic only against tumor cells but not to normal cells.

271 citations

Journal ArticleDOI
TL;DR: The present review examines the evidence for the significance of co-selection for antibiotic resistance among bacteria exposed to biocides used as disinfectants, antiseptics and preservatives, and to heavy metals used as growth promoters and therapeutic agents for some livestock species.
Abstract: Concerns have been raised in recent years regarding co-selection for antibiotic resistance among bacteria exposed to biocides used as disinfectants, antiseptics and preservatives, and to heavy metals (particularly copper and zinc) used as growth promoters and therapeutic agents for some livestock species. There is indeed experimental and observational evidence that exposure to these non-antibiotic antimicrobial agents can induce or select for bacterial adaptations that result in decreased susceptibility to one or more antibiotics. This may occur via cellular mechanisms that are protective across multiple classes of antimicrobial agents or by selection of genetic determinants for resistance to non-antibiotic agents that are linked to genes for antibiotic resistance. There may also be relevant effects of these antimicrobial agents on bacterial community structure and via non-specific mechanisms such as mobilization of genetic elements or mutagenesis. Notably, some co-selective adaptations have adverse effects on fitness in the absence of a continued selective pressure. The present review examines the evidence for the significance of these phenomena, particularly in respect of bacterial zoonotic agents that commonly occur in livestock and that may be transmitted, directly or via the food chain, to human populations.

266 citations

Journal ArticleDOI
TL;DR: In this paper, an overview on the application of oxovanadium complexes as catalysts or mediators for oxidations by molecular oxygen, peroxidative oxygenations (both including epoxidations), halogenations and carboxylations of aliphatic and aromatic hydrocarbons, and/or olefins, toward the syntheses of a variety of organic compounds, such as alcohols, ketones, epoxides, aldehydes, organohalides and orcarboxylic acids.

229 citations

Journal ArticleDOI
TL;DR: In this article, the main types of both homogeneous and supported vanadium catalysts and the most efficient catalytic systems in different reactions are presented and compared, and the proposed mechanisms of various catalytic oxidation processes are also outlined.

195 citations

Journal ArticleDOI
TL;DR: The V-Salen and V-salan complexes show higher activity and normally better selectivity in alkene oxidation and higherActivity and enantioselectivity for sulfoxidation than their parent V- salen complexes, therefore being an advantageous alternative ligand system for oxidation catalysis.
Abstract: We report the synthesis and characterization of several chiral salen- and salan-type ligands and their vanadium complexes, which are derived from salicylaldehyde or salicylaldehyde derivatives and chiral diamines (1R,2R-diaminocyclohexane, 1S,2S-diaminocyclohexane, and 1S,2S-diphenylethylenediamine). The structures of H2sal(R,R-chan)2+·2Cl−·(CH3)2CHOH·H2O (1c; H2sal(R,R-chan) = N,N′-salicyl-R,R-cyclohexanediaminium), Etvan(S,S-chen) (3c; Etvan(S,S-chen) = N,N′-3-ethoxy-salicylidene-S,S-cyclohexanediiminato), and naph(R,R-chen) (6c; naph(R,R-chen) = N,N′-naphthylidene-R,R-cyclohexanediiminato) were determined by single-crystal X-ray diffraction. The corresponding vanadium(IV) complexes and several other new complexes involving different salicylaldehyde-type precursors were prepared and characterized in the solid state and in solution by spectroscopic techniques: UV−vis, circular dichroism, electron paramagnetic resonance, and 51V NMR, which provide information on the coordination geometry. The salan comple...

184 citations