A. Nandi, S. Chaudhuri, S. Mazumdar
Jul 1, 1984
Citations
0
Influential Citations
19
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract The crystal structure of the nickel(II) complex (C 20 H 22 N 6 S 2 Ni) of the N 2 S 2 ligand hexan-2,5-dionebis(4-phenyl-thiosemicarbazone) has been solved using diffractometric data. The complex, exhibiting greater antibacterial activity than the free ligand, crystallizes in the space group C2 with a = 17.414(1) A, b = 8.485(1) A, c = 15.129(3) A, β = 104.09(3)°, Z = 4, d(obsd) = 1.425 g cm −3 , d(calc) = 1.438 g cm −3 and μ(Mo-K ga ) = 10.978 cm −1 . The structure has been refined by full-matrix least squares to a final R = 0.033 and R w = 0.041 using 1743 reflections with I ≥ 3σ(I) out of 2049 unique reflections measured (2° ≤ gq ≤ 27°). The hydrogens were either located or placed in their calculated positions. The nickel(II) ion lies in the tetrahedrally distorted square planar ligand field of the tetradentate ligand forming two five membered and one seven membered chelate rings. It is observed that the lack of conjugation in the seven membered chelate rings of the present complex and of similar complexes leads to dissymmetry in the ring geometry. The metal ion is coordinatively unsaturated and available for additional coordination in its axial directions.