Characterization and Crystal Structure of Tris（N-ethyl-N-piperazinyl-carbodithioato-s,s＇）cobalt（III） Complex： Co（S2CNC4H8NC2H5）3＊3H2O

The title compound has been prepared and characterized by elemental analyses, infrared and NMR spectra, and thermal analyses. The crystal and molecular structure of tris(N'-ethyl-N-piperazinly-carbodithioato-s,s')cobalt(Ⅲ) complex, Co(S2CNC4H8NC2H5)3*3H2O, was determined by X-ray diffraction methods. The compound crystallizes in trigonal system, space group R-3, with lattice parameters a= 1.37700(19) nm, b= 1.37700(19) nm, c=3.0090(6)nm, y=120°, Mr=680.98, V=4.9411(14) nm3, Z=6, De= 1.373 g/cm^3, F(000)=2160, R=0.0510 and wR=0.1436. In the structure, central Co atom coordination geometry is slightly distorted octahedron with the six S atoms from the three bidentate S2CNC4H8NC2H5 ligands. The octahedron is distorted resulting from forced configuration of the four-membered chelate ring. The six Co-S bond distances are in the range of 0.22682(13)-0.22703(14) nm. The IR and NMR spectral data are in agreement with the structural data. The thermal analytical data indicate that it decomposed completely at the temperature of 799.97 ℃, leaving CoS.