Dipanwita Das

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The combination of two highly non-innocent ligands with a third-row transition metal produces the title complex ion which was crystallised as [Os(Q)(2)(bpy)](ClO(4))·C(6)H(6) (Q = 4,6-di-tert-butyl-o-iminobenzoquinones, bpy = 2,2'-bipyridine) and could be structurally characterised to exhibit a tris-chelate situation at the metal with trans-positioned N and(More)
Complexes [Os(pap)(2)(Q)] (1-4) have been obtained and structurally characterized for pap = 2-phenylazopyridine and Q = 4,6-di-tert-butyl-N-aryl-o-iminobenzoquinone (aryl = phenyl (1), 3,5-dichlorophenyl (2), 3,5-dimethoxyphenyl (3), or 3,5-di-tert-butylphenyl (4)). The oxidized form (3)(ClO(4))(2) was also crystallographically characterized while the(More)
A new tris-heteroleptic complex [Ru(bpy)(dppz)(OSO)](ClO4), [1](ClO4) (bpy = 2,2'-bipyridine, dppz = dipyrido[3,2-a:2',3'-c]phenazine and OSO = 2-methylsulfinylbenzoate), was synthesized and characterized to control the photochromic Ru-S → Ru-O linkage isomerization. Details isomerization kinetics studied by UV-visible absorption spectroscopy and cyclic(More)
A pyrene-based colorimetric chemosensor 1-(pyren-1-yl)-N,N-bis-(pyridine-2-ylmethyl)methanamine (1) was synthesised for selective detection of Cu (II) and Fe (III) over the other metal cations Ni2+, Mg2+, Cd2+, Hg2+, Na+, K+, Ca2+, Co2+, Cr3+, Pb2+ and Zn2+. The significant changes in UV-vis absorption band of receptor 1 and the emergence of 660nm band in(More)
Three new compounds, [Ru(Q(*-))(acac)(2)] = 1, [Ru(Q(*-))(2)(acac)] = 2, and [Ru(Q(*-))(3)] = 3, were obtained and characterized as Ru(III) complexes with 4,6-di-tert-butyl-N-phenyl-o-iminobenzosemiquinone (Q(*-)) ligands. All three systems show multiple electron transfer behavior, which was analyzed using electron paramagnetic resonance (EPR) and(More)
Fluorescent molecular rotors find widespread application in sensing and imaging of microscopic viscosity in complex chemical and biological media. Development of viscosity-sensitive ultrafast molecular rotor (UMR) relies upon the understanding of the excited-state dynamics and their implications for viscosity-dependent fluorescence signaling. Unraveling the(More)
The article deals with the ruthenium complexes, [(bpy)Ru(Q')(2)] (1-3) incorporating two unsymmetrical redox-noninnocent iminoquinone moieties [bpy = 2,2'-bipyridine; Q' = 3,5-di-tert-butyl-N-aryl-1,2-benzoquinonemonoimine, aryl = C(6)H(5) (Q'(1)), 1; m-Cl(2)C(6)H(3) (Q'(2)), 2; m-(OCH(3))(2)C(6)H(3) (Q'(3)), 3]. 1 and 3 have been preferentially stabilised(More)
The complexes [(pap)(2)Ru(Q)]ClO(4), [1]ClO(4)-[4]ClO(4), with two different redox noninnocent ligands, Q = 3,5-di-tert-butyl-N-aryl-1,2-benzoquinonemonoimine (-aryl = m-(Cl)(2)C(6)H(3) (1(+)), C(6)H(5) (2(+)), m-(OCH(3))(2)C(6)H(3) (3(+)), and m-((t)Bu)(2)C(6)H(3) (4(+))) and pap = 2-phenylazopyridine, have been synthesized and characterized using various(More)
Coordination compounds [Ru(acac)(2)(Q)] (acac=acetylacetonate; Q=o-benzoquinone) were prepared as complexes 1 (Q=o-benzoquinone), 2 (Q=3-methoxy-o-benzoquinone), 3 (Q=4-methyl-o-benzoquinone), and 4 (Q=3,5-di-tert-butyl-o-benzoquinone). The structures of 1 and 2 were determined to reveal a Ru(III)/o-benzosemiquinone formulation, supported by analysis of(More)
1,2,4,5-Tetrakis(phenyselenomethyl)benzene (L) has been synthesized by reaction of in situ generated PhSe(-) with 1,2,4,5-tetrakis(bromomethyl)benzene in N(2) atmosphere. Its first bimetallic complexes and a bis-pincer complex having compositions [(η(3)-C(3)H(5))(2)Pd(2)(L)][ClO(4)](2) (1) [Pd(2)(C(5)H(5)N)(2)(L)][BF(4)](2) (2) and(More)