REACTION OF TRANSITION-METAL THIOLATO UNITS .3. SYNTHESES AND X-RAY STRUCTURAL CHARACTERIZATION OF PHOSPHINE COBALT(II) COMPLEXES WITH 2-MERCAPTOBENZOTHIAZOLE

Mononuclear cobalt(II) complexes Co(mbt-N)(2)(PBu(3)(n))(2) (1) (Hmbt = 2-mercaptobenzothiazole; PBu(3)(n) = tri-n-butyphosphine) and Co(mbt -S,N)(2)(dppe). MeCN (2) [dppe = 1,2-bis(diphenylphosphino) ethane] we re synthesized and characterized by X-ray crystallography, IR and EPR spectra, cyclic voltammetric data and magnetic susceptibility measurem ents. The Co atom in (1) exhibits an approximate square-planar geometr y with the heterocyclic N-donors from mbt bonding to the cobalt atom i n a monodentate mode. Complex (2) has a distorted octahedral environme nt of Co with both the exocyclic-S and the hetero-N donors of mbt boun d to the cobalt atom in a bidentate chelating mode. The Co atom in bot h complexes shows spin state of S = 3/2 with mu(eff) of 4.25 and 4.40 mu(B) for 1 and 2, respectively. (C) 1997 Elsevier Science Ltd.