Crystal structure and thermal analysis of a 4,4 '-bipy-bridged binuclear zinc(II) complex, 2[R2NCS2](2)center dot Zn(4,4 '-bipy) (R=Piperidyl)

The crystal structure of the title complex 2[R2NCS2](2). Zn(4,4 ' -bipy) (R = Piperidyl), 1, revealed that it consists of dimers made up from two crys tallographically independent molecules. Each zinc atom in 1 forms a 5-coord inate pseudo-square-based pyramidal arrangement (with four Zn-S and one Zn- N interactions). Bondlengths to Zn with the coordinating atoms are comparab le to those in other Zn(II) dithiocarbamate complexes. The piperidine ring has a chair conformation. To allow improved packing, the title complex mole cules form an approximately linear arrangement extending along both a and b . TGA showed that 1 is decomposed in two close steps to produce ZnS as iden tified by residual weight. The complex 1 crystallizes in the monoclinic spa ce group C2/c with cell parameters: a = 22.021(5), b = 22.215(3), c = 17.53 7(2) Angstrom, beta = 93.49(2)degrees, V = 8563(3) Angstrom (3) and Z = 8. The structure was refined by full-matrix least-squares methods to R = 0.067 , R-w = 0.114.