COBALT COMPLEXES WITH PNICOGEN (PHOSPHINE OR PYRIDINE) AND THIOLATO LIGANDS - SYNTHESES, X-RAY CRYSTAL-STRUCTURES AND SPECTROSCOPIC CHARACTERIZATION

Mixed pnicogen and thiolato mononuclear cobalt complexes, CO(SR)2(PBun 3)2 [R = Ph (1); R = Stolyl-p (2)] and Co(mpo)2L [L = PBun3 (3); L = P y (4)], have been synthesized and studied spectroscopically. The compl exes 1 and 2 are tetrahedral, as determined by magnetic susceptibility studies. The structures of 3 and 4 were determined by X-ray diffracti on. The cobalt(II) ions in both 3 and 4 are in a square-pyramidal envi ronment with the two trans-oriented mpo ligands in the basal plane and the pnicogen group in the axial position.