Synthesis, spectroscopic characterization and structural studies of nickel complexes of O,O′-diaryl(dibenzyl) dithiophosphates: Crystal structures of Ni[S2P(OC6H4CH3-o)2]2, Ni[S2P(OC6H4CH3-m)2]2 and Ni[S2P(OCH2Ph)2]2

Purple-coloured, tetra-coordinated Ni(II) complexes, Ni[S2P(OR)2]2 (R = o-, m-, p-OC6H4Me, Ph and CH2Ph) have been obtained by reaction of NiCl2 with salts of corresponding O,O′-diaryl(dibenzyl) dithiophosphates and characterized by elemental analysis, UV, IR, 1H, and 31P NMR spectroscopy. The crystal structures of Ni[S2P(OC6H4Me-o)2]2, Ni[S2P(OC6H4Me-m)2]2 and Ni[S2P(OCH2Ph)2]2 are also described.