Titas Mukherjee
University of Burdwan
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Featured researches published by Titas Mukherjee.
Journal of Coordination Chemistry | 2012
Hena Paul; Titas Mukherjee; Michael G. B. Drew; Pabitra Chattopadhyay
The reaction of cis-[RuCl2(dmso)4] with [6-(2-pyridinyl)-5,6-dihydrobenzimidazo[1,2-c]quinazoline] (L) afforded in pure form a blue ruthenium(II) complex, [Ru(L1)2] (1), where the original L changed to [2-(1H-benzoimidazol-2-yl)-phenyl]-pyridin-2-ylmethylene-amine (HL1 ). Treatment of RuCl3 · 3H2O with L in dry tetrahydrofuran in inert atmosphere led to a green ruthenium(II) complex, trans-[RuCl2(L2)2] (2), where L was oxidized in situ to the neutral species 6-pyridin-yl-benzo[4,5]imidazo[1,2-c]quinazoline (L2 ). Complex 2 was also obtained from the reaction of RuCl3 · 3H2O with L2 in dry ethanol. Complexes 1 and 2 have been characterized by physico-chemical and spectroscopic tools, and 1 has been structurally characterized by single-crystal X-ray crystallography. The electrochemical behavior of the complexes shows the Ru(III)/Ru(II) couple at different potentials with quasi-reversible voltammograms. The interaction of these complexes with calf thymus DNA by using absorption and emission spectral studies allowed determination of the binding constant K b and the linear Stern–Volmer quenching constant K SV.
Journal of Coordination Chemistry | 2013
Hena Paul; Titas Mukherjee; Manjira Mukherjee; Tapan Kumar Mondal; Anuradha Moirangthem; Anupam Basu; Ennio Zangrando; Pabitra Chattopadhyay
Two ruthenium(II) complexes of newly designed pyrrol-azo ligands(L) and bipyridine(bpy) formulated as [Ru(L)(bpy)2]ClO4, where HL1 = (4-chloro-phenyl)-(1H-pyrrol-2-yl)-diazene (1) complex 1 and HL2 = (4-nitro-phenyl)-(1H-pyrrol-2-yl)-diazene for 2, were isolated in pure form. The complexes were characterized by physicochemical and spectroscopic methods. The electrochemical behavior of the complexes showed the Ru(III)/Ru(II) couple at different potentials with quasi-reversible voltammograms. The study of cytotoxicity effects of 1 and 2 on human breast cancer cells (MCF 7, MDA-MB 231) and cervical cancer cell (HeLa) taking Cisplatin as a positive reference showed that 1 exhibited higher cytotoxicity against cancer cell lines than 2, but less activity than Cisplatin. The interaction of 1 with calf thymus DNA (CT-DNA) using absorption, emission spectral studies, viscosity-measurement, and electrochemical techniques has been used to determine the binding constant K b and the linear Stern–Volmer quenching constant K SV. The results indicate that 1 strongly interacts with CT-DNA in groove binding mode. The interaction of bovine serum albumin (BSA) with 1 was also investigated with the help of spectroscopic tools. Absorption spectroscopy proved the formation of a BSA-[Ru(L1)(bpy)2]ClO4 complex.
Journal of Coordination Chemistry | 2014
Titas Mukherjee; Manjira Mukherjee; Buddhadeb Sen; Snehasis Banerjee; Geeta Hundal; Pabitra Chattopadhyay
Three mononuclear cyclometalated iridium(III) complexes having dithiocarbamate ligands, [IrIII(2-C6H4py)2(L)] (where 2-C6H4py = 2-phenylpyridine; and L1H = 4-MePipzcdtH, L2H = MorphcdtH, and L3H = 4-BzPipercdtH for 1, 2, and 3, respectively), were synthesized from [Ir(2-C6H4py)2Cl]2·1/4CH2Cl2 by displacing the two bridging chlorides with one dithiocarbamate ligand. The complexes were characterized using physicochemical and spectroscopic tools along with structural analysis of [Ir(2-C6H4py)2(L2)] (2) by single crystal X-ray diffraction. Structural analysis of 2 showed a distorted octahedron in which the nitrogen donor of one 2-phenylpyridine and the carbon donor of another 2-phenylpyridine are in axial positions, trans to one another. Electrochemical analysis by cyclic voltammetry showed the irreversible two-electron equivalent reduction voltammograms of 1, 2, and 3 attributable to Ir(III) to Ir(I). Electronic characterizations of these complexes are consistent with significant delocalization of the sulfur electron density onto the empty metal d-orbital. The intercalative interaction of the complexes with calf thymus DNA was evaluated using absorption, fluorescence quenching, and viscosity measurements. The binding affinities of these complexes with bovine serum albumin were estimated in terms of quenching constants using the Stern–Volmer equation. Study of antibacterial activities of the complexes by agar disk diffusion against some species of pathogenic bacteria was also performed. Graphical Abstract
Analyst | 2012
Supriti Sen; Titas Mukherjee; Basab Chattopadhyay; Anuradha Moirangthem; Anupam Basu; Jaromír Marek; Pabitra Chattopadhyay
Journal of Molecular Structure | 2010
Sandipan Sarkar; Titas Mukherjee; Supriti Sen; Ennio Zangrando; Pabitra Chattopadhyay
Inorganica Chimica Acta | 2011
Sourav Dey; Sandipan Sarkar; Titas Mukherjee; Biplab Mondal; Ennio Zangrando; Jean-Pascal Sutter; Pabitra Chattopadhyay
Transition Metal Chemistry | 2011
Sourav Dey; Titas Mukherjee; Sandipan Sarkar; Helen Stoeckli Evans; Pabitra Chattopadhyay
Analyst | 2011
Supriti Sen; Titas Mukherjee; Sandipan Sarkar; Subhra Kanti Mukhopadhyay; Pabitra Chattopadhyay
Polyhedron | 2014
Titas Mukherjee; Buddhadeb Sen; Animesh Patra; Snehasis Banerjee; Geeta Hundal; Pabitra Chattopadhyay
Inorganica Chimica Acta | 2013
Titas Mukherjee; Buddhadeb Sen; Ennio Zangrando; Geeta Hundal; Basab Chattopadhyay; Pabitra Chattopadhyay