Colorless comples [CuSC6H2Bu3^t-2,4,6]n reacted with CS2 to give a yellow product, which was recrysterized from CS2-C2H5OH to form yellow crystals, the structure of the crystal was shown to be [Cu(S2CSC6H2Bu3^t-2,4,6)]4.4C2H5OH by single srystal X-ray diffraction method. the crystal belongs to the tetraponalspace group 142d with unit cell parameters: a=b=1.7079(3)nm , c=3.5228(10)nm, V=10.275(6)nm^3, Dc=1.198g cm^-3, Z=4. the structure was refined to R=0.0559 for 1863 reflections. in the molecule , cCu4 cluster has a distorted tetrahedral configuration. surrounding this tetrahedron are four thioxnthate lignds (RSCS2) formed by insertion fo CS2 into Cu-S bonds the ligand coordinates to copper atoms through two sulfur atoms, one of which baidges two pper atoms, while the other coordinates tothe third copper atom. the coordination geometry of eacch copper atom is planar trigonal. the trithiocarbonato CS3 group resulted from insertion of CS2 into Cu-S bond is approximately coplanar the mean C-S bond length of CS3 is 0.1712 nm. the structural charaoteeristeic and the faotors influencing the insertion reaction are disoussed in the paper.

Key words: CRYSTAL STRUCTURE DETERMINATION, INFLUENCING FACTORS, SULFURIC ACID, CARBON DISULFIDE, XANTHOGENIC ACIDS, CHEMICAL BONDS, COPPER COMPOUNDS, INSERTION REACTION, TERT.-BUTYL GROUP, COORDINATE CHEMISTRY