Synthesis and structural elucidation of new complexes of 2,4- and 3,5-dimethyl diphenyldithiophosphates with cobalt(II)

摘要

A new series of donor-stabilized addition complexes of cobalt(II) with disubstituted diphenyldithiophosphates [{(ArO)_2PS_2}_2CoL_2] {Ar = 2,4- (CH_3)_2C_6H_3 [(1)–(3)] and 3,5-(CH_3)_2C_6H_3 [(4)–(6)]; L = C_5H_5N [(1), (4)], 3,4- (CH_3)_2C_5H_3N [(2), (5)] and 4-(C_2H_5)C_5H_4N [(3), (6)]} were successfully isolated and characterized by elemental analyses, magnetic moment measurements, IR and single-crystal X-ray analysis. Complexes (3), (4) and (5) crystallize in the monoclinic space groups P2_(1), P2_(1) and P2_(1/c), respectively, whereas complex (6) crystallizes in the triclinic space group P1. X-ray diffraction analysis of complexes (3)–(6) reveals a six-coordinated distorted octahedral geometry for the CoS_4N_2 chromophore defined by two chelating diphenyldithiophosphate anions as well as two N-donor ligands. Two diphenyldithiophosphate ligands are coordinated to the cobalt ion as a bidentate ligand chelating via the two thiolate S atoms. Each of them forms a four-membered chelate ring in the equatorial plane. The N atoms from two donor ligands are axially coordinated to the Co atom in a mutually trans position.