CONTRIBUTIONS TO THE CHEMISTRY OF SILICON - SULFUR-COMPOUNDS .66. SYNTHESIS, CRYSTAL AND MOLECULAR-STRUCTURE OF CETONITRILE)COBALT(II)[(T-C4H9O)(3)SIS]CO-2(NCCH3)

The title compound [(t-C4H9O)(3)SiS]Co-2(NCCH3)] 1 was obtained by rea ction of anhydrous cobalt(II) chloride with tri-tert-butoxysilanethiol and triethylamine in acetonitrile as a solvent. The compound crystall izes as deep-blue orthorhombic plates with a = 17.779(4), b = 45.363(9 ), c = 9.096(2) Angstrom, space group Fdd2 and Z = 8. The structure wa s solved by Patterson synthesis and refined to the R value of 0.0343. The crystal consists of mononuclear complexes in which the cobalt atom is five-fold coordinated to two sulphurs, two oxygens and one nitroge n in a distorted trigonal bipyramidal arrangement. The relevant bond d istances and angles are: Co-S, 2.2680(7); Co-N, 2.065(4); Co-O1, 2.283 (2); S-Si, 2.0666(8) Angstrom; S-Co-S', 119.14(4); N-Co-S, 120.43(2); O1-Co-O1', 178.81(10)degrees.