STEREOCHEMISTRY OF MIXED THIOLATE AND DITERTIARY PHOSPHINE COBALT(II) COMPLEXES - CRYSTAL-STRUCTURES OF [CO(PH2P(CH2)3-PPH2)(SPH)2] AND [CO(PH2PCH2CH2P(PH)CH2CH2PPH2)-(SPH)2]

The complexes [Co(dppp) (SPh)2] [dppp = 1,3-bis(diphenylphosphino)propane] and [Co(bdpp)-(SPh)2] [bdpp = bis(2-diphenylphosphinoethyl)phenylphosphine] were prepared in good yields by treating Co(dppp) Cl2 with NaSPh and elemental selenium in dimethylformamide and by treating CoCl2.6H2O and bdpp in acetonitrile with NaSPh, respectively. The complex [Co(dppp) (SPh)2] crystallizes in the triclinic space group P1BAR, with a = 9.665(2), b = 10.75(1), c = 18.288(2) angstrom, alpha = 102.41 (1), beta = 93.89(1), gamma = 92.40(1)-degrees and Z = 2, whereas the complex [Co(bdpp) (SPh)2] is monoclinic, space group Cc, with a = 16.374(2), b = 26.033(3), c = 10.873(5) angstrom, beta = 117.49(2)-degrees and Z = 4.