Cobalt complexes with pnicogen (phosphine or pyridine) and thiolato ligands. Syntheses, X-ray crystal structures and spectroscopic characterization

Abstract Mixed pnicogen and thiolato mononuclear cobalt complexes, Co(SR) 2 (PBu n 3 ) 2 [R = Ph ( 1 ); R = Stolyl- p ( 2 )] and Co(mpo) 2 L [L = PBu n 3 ( 3 ); L = Py ( 4 )], have been synthesized and studied spectroscopically. The complexes 1 and 2 are tetrahedral, as determined by magnetic susceptibility studies. The structures of 3 and 4 were determined by X-ray diffraction. The cobalt(II) ions in both 3 and 4 are in a square-pyramidal environment with the two trans -oriented mpo ligands in the basal plane and the pnicogen group in the axial position.