Issue 4, 2003

Synthesis and characterisation of new homoleptic rhenium thiosemicarbazone complexes

Abstract

A series of new rhenium(III) complexes, [ReL2]+, where LH = a 2-formylpyridine thiosemicarbazone have been synthesised and characterised. The complexes have been synthesised from the Re(V) starting material [ReOCl3(PPh3)2] and from [ReO4] in the presence of triphenylphosphine. All of the new compounds have been characterised by X-ray crystallography, NMR and mass spectroscopy. In all cases the Re atom is in a distorted octahedral environment with two tridentate deprotonated thiosemicarbazones binding as monoanionic ligands through the sulfur, pyridyl nitrogen and azamethinic nitrogen in a mer (azomethine nitrogen atoms trans) configuration. Electrochemical measurements show that the complexes undergo two reversible reductions at biologically accessible potentials. Under certain conditions the 2-formylpyridine thiosemicarbazone ligands undergo reductive cleavage of the hydrazinic N–N bond resulting in the formation of a rhenium complex of methyl(2-pyridyl)methyleneimine which has been characterised by X-ray crystallography.

Graphical abstract: Synthesis and characterisation of new homoleptic rhenium thiosemicarbazone complexes

Supplementary files

Article information

Article type
Paper
Submitted
25 Oct 2002
Accepted
04 Dec 2002
First published
21 Jan 2003

Dalton Trans., 2003, 748-754

Synthesis and characterisation of new homoleptic rhenium thiosemicarbazone complexes

A. R. Cowley, J. R. Dilworth, P. S. Donnelly and J. Woollard-Shore, Dalton Trans., 2003, 748 DOI: 10.1039/B210540N

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