Monodentate and bridging bidentate functions of 4,4′-bipyridine in the crystal structures of [Zn(4,4′-Bipy){(n-C3H7)2NCS2}2] and [Zn2(4,4′-Bipy){(n-C3H7)2NCS2}4]

The structures of the mixed-ligand complexes Zn(4,4'-Bipy)/(n-C3H7)(2)NCS2)(2) (I) and Zn-2(4,4'-Bipy)/(n-C3H7)(2)NCS2)(4) (II) were determined by single crystal X-ray diffractometry (CAD-4 diffractometer, MoKalpha radiation, 2479 and 1616 F-hkl, R = 0.0550 and 0.0523). The crystals are monoclinic with cell parameters a = 16.560(2), b = 11.423(1), c = 15.319(2) Angstrom, beta = 194.27(1)degrees, V = 2889.8(6) Angstrom(3), Z = 4, space group P2(1)/c (for 1) and a = 8.515(1), b = 10.965(1), c = 2Z816(3) Angstrom, beta = 9.5.860(1)degrees, V = 2583.5(5) Angstrom(3), Z = 2, space group P2(1)/n (for II). The structure of I is composed of discrete mononuclear molecules; the structure of 11 consists of discrete centrosymmetric binuclear molecules. The coordination polyhedra of the Zn atoms (c.n. 5) are formed by four S a toms of the two cyclic bidentate dithiocarbamate ligands and the N atom of the 4,4'-Bipy ligand, which is monodentate in I and bridging bidentate in H Molecular packings and interactions in the structures are considered.