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Synthesis, structure and electrochemical properties of some thiosemicarbazone complexes of ruthenium

Datta, S., Drew, M. G. B. and Bhattacharya, S. (2011) Synthesis, structure and electrochemical properties of some thiosemicarbazone complexes of ruthenium. Indian Journal of Chemistry Section A, 50 (9-10). pp. 1403-1409. ISSN 0975-0975

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Reaction of salicylaldehyde thiosemicarbazone (L-1), 2-hydroxyacetophenone thiosemicarbazone (L-2) and 2-hydroxynapthaldehyde thiosemicarbazone (L-3) with [Ru(dmso)(4)Cl-2] affords a family of three dimeric complexes (1), (2) and (3) respectively. Crystal structure of the complex (3) has been determined. In these complexes, each monomeric unit consists of one ruthenium center and two thiosemicarbazone ligands, one of which is coordinated to ruthenium as O,N,S-donor and the other as N,S-donor forming a five-membered chelate ring. Two such monomeric units remain bridged by the sulfur atoms of the O,N,S-coordinated thiosemicarbazones. Due to this sulfur bridging, the two ruthenium centers become so close to each other, that a ruthenium-ruthenium single bond is also formed. All the complexes are diamagnetic in the solid state and in dimethylsulfoxide solution show intense absorptions in the visible and ultraviolet region. Origin of these spectral transitions has been established from DFT calculations. Cyclic voltammetry on the complexes shows two irreversible ligand oxidations on the positive side of SCE and two irreversible ligand reductions on the negative side.

Item Type:Article
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:30426
Uncontrolled Keywords:Coordination chemistry; Coordination modes; Thiosemicarbazones; Ruthenium
Publisher:National Institute of Science Communication and Information Resources, CSIR


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