Synthesis, spectroscopic characterization and structural studies of chloro dioxotriphenylphosphine oxide (O,O-dialkyl/diphenyl(alkylene)dithiophosphate) molybdenum(VI) complexes: crystal structure of MoO2Cl2(OSMe2)2

Reactions of dichlorodioxobis(triphenylphosphine oxide)molybdenum(VI) complexes with ammonium/sodium salts of O,O-dialkyl(alkylene) and diphenyl dithiophosphoric acids in 1:1 molar ratio in dichloromethane solution yield dioxomolybdenum complexes of the types, MoO2Cl[S2P(OR)2] · OPPh3 (R=Me, Et, i-Pr, Ph) and MoO2Cl[S2] · OPPh3. (G=–CH2CMe2CH2O–, –OCMe2CMe2O–). These newly synthesized compounds were characterized by IR, UV–visible and 1H NMR spectroscopy and elemental analysis. The molecular structure of MoO2Cl2(OSMe2)2 was determined by single-crystal X-ray diffraction. MoO2Cl2(OSMe2)2 crystallizes as orthorhombic in the space group Pbca with cell parameters a=13.7235(3) Å, b=12.2429(2) Å, c=14.3356(3) Å, V=2408.60(8) Å−3, Z=8, R=0.0221, Rw=0.0519. There are two cis oxo ligands, two cis dimethylsulphoxide moieties and two trans chlorine atoms in a distorted octahedral environment around molybdenum.