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Raj K. Poddar

Bio: Raj K. Poddar is an academic researcher from Indian Institute of Technology Kanpur. The author has contributed to research in topics: Ruthenium & Triphenylarsine. The author has an hindex of 7, co-authored 14 publications receiving 300 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a new Ru(III) complex, [RuBr3(AsPh3)3] has been synthesized, which is characterised by analyses, conductivity and magnetic measurements, molecular weight and spectral studies (IR and visible).

135 citations

Journal ArticleDOI
TL;DR: A new complex of ruthenium(II) with triphenylarsine [Ru(AsPh3)2Cl2]2 has been prepared and structures have been assigned on the basis of magnetic, spectral and other physical studies as discussed by the authors.

28 citations

Journal ArticleDOI
TL;DR: Ru(PPh3)2Cl2 and [Ru(AsPh3]2CL2]2 have been reacted with aniline, o-chloroniline and o-toluidine, quinoline, 2-methylpyridine, N,N′-bipyridyl, diethylamine and triethylamine.

22 citations

Journal ArticleDOI
TL;DR: In this article, the electronic spectra of [RuCl3(AsPh3)3] with ligands containing nitrogen (alkyl and aryl cyanides, pyridine, α-picoline N.N′-bipyridyl, 1,10-phenanthroline), oxygen (ketones, aldehydes, N,N-dimethylformamide, tetrahydrofuran, dimethylsulphoxide and nitroalkanes) and sulphur (CS2 and Me2S) donor atoms have been studied

11 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the reaction of ruthenium(II) complexes with bidentate Schiff base ligands derived by condensing salicylaldehyde with aniline, o-, m- or p-toluidine has been carried out.
Abstract: The reactions of ruthenium(II) complexes, [RuHCl(CO)(PPh3)2(B)] [B = PPh3, pyridine (py) or piperidine (pip)], with bidentate Schiff base ligands derived by condensing salicylaldehyde with aniline, o-, m- or p-toluidine have been carried out. The products were characterised by analytical, i.r., electronic, 1H-n.m.r. and 31P-n.m.r. spectral studies and are formulated as [RuCl(CO)(L)(PPh3)(B)] (L = Schiff base anion; B = PPh3, py or pip). An octahedral structure has been tentatively proposed for the new complexes. The Schiff bases and the new complexes were tested in vitro to evaluate their activity against the fungus Aspergillus flavus.

573 citations

Journal ArticleDOI
TL;DR: The selectivity and sensitivity of two colorimetric sensors based on the ruthenium complexes N719 and N749 are described, found that mercury ions coordinate reversibly to the sulfur atom of the dyes' NCS groups, which induces a color change in the dye groups at submicromolar concentrations of mercury.
Abstract: The selectivity and sensitivity of two colorimetric sensors based on the ruthenium complexes N719 [bis(2,2‘-bipyridyl-4,4‘-dicarboxylate)ruthenium(II) bis(tetrabutylammonium) bis(thiocyanate)] and ...

300 citations

Journal ArticleDOI
TL;DR: The representative Schiff bases and their complexes were tested in vitro to evaluate their activity against fungi, namely, Aspergillus flavus (A. flavus) and Fusarium species.

206 citations

Journal ArticleDOI
TL;DR: In this paper, the synthesis and properties of several complexes of Ru(II) containing 4,4,dicarboxy-2,2,bipyridine (dcbpyH2), 2,6-bis(1-methylbenzimidazol-2-yl)pyridine, and monodentate ligands (X- = Cl-, I-, NCS-, NCSe-, CN-) are reported.
Abstract: The synthesis and properties of several complexes of Ru(II) containing 4,4‘-dicarboxy-2,2‘-bipyridine (dcbpyH2), 2,6-bis(1-methylbenzimidazol-2-yl)pyridine (bmipy), or 2,6-bis(1-methylbenzimidazol-2-yl)-4-phenylpyridine (ph-bmipy), and monodentate ligands (X- = Cl-, I-, NCS-, NCSe-, CN-) are reported. The introduction of the ambident ligands X- = NCS-, NCSe-, and CN- into the coordination sphere of [Ru(bmipy)(dcbpy)I]- and cis-Ru(dcbpyH2)2Cl2 has been studied in situ via 1H and 13C NMR spectroscopy using 13C-enriched ligands X-. Introduction of thiocyanate and selenocyanate initially yields the two possible linkage isomers in comparable amounts; prolonged reaction time converts the S-bound isomer and the Se-bound isomer to the N-bound isomers. The isoselenocyanate complex decomposes rapidly, yielding the cyano complex under loss of Se. The N-bound isothiocyanato complex K[Ru(bmipy)(dcbpy)(NCS)] was found to be an efficient sensitizer for nanocrystalline TiO2; the incident monochromatic photon-to-current e...

163 citations

Journal ArticleDOI
TL;DR: In vitro antitumor potencies of these complexes in colon cancer cells and ovarian cancer cells vary by more than 2 orders of magnitude, pointing to the influence of additional factors.
Abstract: Antineoplastic ruthenium(III) complexes are generally regarded as prodrugs, being activated by reduction. Within a homologous series of ruthenium(III) complexes, cytotoxic potency is therefore expected to increase with increasing ease of reduction. Complexes of the general formula [RuIIICl(6-n)(ind)n](3-n)- (n = 0−4; ind = indazole; counterions = Hind+ or Cl-) and the compound trans-[RuIICl2(ind)4] have been prepared and characterized electrochemically. Lever's parametrization method predicts that a higher indazole-to-chloride ratio results in a higher reduction potential, which is confirmed by cyclic voltammetry. In vitro antitumor potencies of these complexes in colon cancer cells (SW480) and ovarian cancer cells (CH1) vary by more than 2 orders of magnitude and increase in the following rank order: [RuIIICl6]3- < [RuIIICl4(ind)2]- < [RuIIICl5(ind)]2- ≪ [RuIIICl3(ind)3] < [RuIIICl2(ind)4]+ ≈ [RuIICl2(ind)4]. Thus, the observed differences in potency correlate with reduction potentials largely, though n...

150 citations