Abstract
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] were synthesized and characterized by X-ray crystallography, IR and EPR spectra, cyclic voltammetric data and magnetic susceptibility measurements. The Co atom in ( 1) exhibits an approximate square-planar geometry with the heterocyclic N-donors from mbt bonding to the cobalt atom in a monodentate mode. Complex ( 2) has a distorted octahedral environment of Co with both the exocyclic-S and the hetero-N donors of mbt bound to the cobalt atom in a bidentate chelating mode. The Co atom in both complexes shows spin state of S =3/2 with μ eff of 4.25 and 4.40μ B for 1 and 2, respectively.
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