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Complexes based on asymmetrically substituted pyridine-dithiolene ligands [M(4-pedt)(2)] (M = Au, Cu, Ni; 4-pedt = 1-(pyridin-4-yl)-ethylene-1,2-dithiolate): Synthesis, structure and physical properties

Rabaça, S. ; Cerdeira, A. ; Pereira, L. ; Fourmigué, M. ; Henriques, R. T. ; Almeida, M.

Polyhedron Vol. 28, Nº 6, pp. 1069 - 1078, April, 2009.

ISSN (print): 0277-5387
ISSN (online):

Journal Impact Factor: 1,801 (in 2008)

Digital Object Identifier: 10.1016/j.poly.2009.01.015

Abstract
The monoanionic Ni, Au and Cu bisdithiolene complexes based on the 1-(pyridin-4-yl)-ethylene-1,2-dithiolate were prepared and isolated as [PPh4](+), [n-Bu4N](+) and [Na(18C6)](+) salts which were characterised by single-crystal X-ray diffraction, cyclic voltammetry, EPR and magnetic susceptibility measurements. All the complexes adopt a square planar coordination geometry with a trans arrangement of the substituent pyridine rings whose planes are rotated from 13 degrees to 33 degrees relatively to the central MS4 core.The C-C and C-S bond lengths are consistent with ene-1,2-dithiolate form of the ligand and M-III oxidation state. The Ni complexes are paramagnetic with an effective magnetic moment of similar to 1.7 BM