Photoluminescent Mo(IV) and W(IV) bis-dithiolene complexes with bidentate phosphonodithioato ligand derived from Lawesson’s reagent

Abstract

Synthesis of phosphonodithioato complexes of Mo(IV) and W(IV) bis- dithiolene have been reported. These complexes are characterized by elemental analysis, X-ray crystallography, IR, UV–Vis, 31P NMR, and photoluminescence spectroscopy, electrochemical studies and these results are corroborated by DFT level of calculations. Phosphonodithioato ligands is generated in situ from the reaction of Lawesson’s reagent with mono-oxo Mo/W bis dithiolenes complexes resulting its chelation coupled with oxo transfer reaction from M(IV) bound oxo to {P=S} moiety forming (P=O} group. The new complexes are photoluminescent at room temperature.