Synthesis and characterization of 3-picoline adducts of bis(O,O′-ditolyl/dibenzyl/diphenyl dithiophosphato)cobalt(II) complexes: crystal structure of 3-picoline adducts Co{S2P(OC6H4Me-p)2}2(NC5H4Me-3)2

Bis(O,O′-ditolyl/dibenzyl/diphenyl dithiophosphato)cobalt(II) (1–5) with 3-picoline, Co{S2P(OR)2}2(NC5H4Me-3)2 (R = o-, m-, p-C6H4Me, CH2Ph, Ph) have been synthesized by in situ reaction of 3-picoline and CoCl2·6H2O in aqueous medium followed by the addition of aqueous solution of NH4S2P(OR)2. The single crystal structure of Co{S2P(OC6H4Me-p)2}2(NC5H4Me-3)2 shows that geometry around cobalt(II) is distorted octahedral with two 3-picoline molecules in trans positions. These Co(II) dithiophosphate complexes (1–5) have been characterized by elemental analyses, spectroscopic techniques (UV-Vis, IR), and magnetic moment measurements.