Structure of the adduct of bis(O,O′-diisopropyldithiophosphato) metal with pyridine:: Ni[(iPrO)2PS2]2(py)2 and Cd[(iPrO)2PS2]2 (py)2(py = pyridine)

The crystal and molecular structures of the complex of [N-i{(iPrO)(2)dtp}(2)(py)(2)] and [Cd{(iPrO)(2)dtp}(2)(py)(2)] (dtp=dithiophosphate, py=pyridine) have been determined by X-ray crystallography. They are isomorphous. The crystal structures are very similar and consist of discrete molecules of [Ni{(iPrO)2dtp}(2)(py)(2)] and [Cd{(iPrO)(2)dtp}(2)(py)(2)], respectively. They both crystallize in the monoclinic system, space group P2(1)/c, the former with lattice parameters a=6.489(1)Angstrom, b=14.830(3) Angstrom, c=16.386(3) Angstrom, beta=99.74(3) and Z=2; the latter with a=6.461(3)Angstrom, b=14.583(4) Angstrom, c=17.433(4) Angstrom, beta=99.53(3)degrees, and Z=2. They all display distorted octahedral geometry around the central metal atom. In the complexes, two O,O'-diisopropyl dithiophosphate ions act as bidentate ligands with their S atoms coordinated to metal. Each forms a four-membered chelate ring in the equatorial plane. The N atoms from two pyridine ligands are axially coordinated to the metal atom. The Ni-S bond distances are 2.5137(10) and 2.5386(9)Angstrom, and the Ni-N bond distances are 2.127(3) Angstrom. The Cd-S(1) and Cd-S(2) bond distance are 2.694(1) and 2.704(1) Angstrom, respectively, and the Cd-N bond distances are 2.399(3) Angstrom. The IR spectra data is in agreement with the structural data.