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):
Scimago Journal Ranking: 0,74 (in 2009)
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
