Crystal Structures and Optical Properties of the Dithiophosphate Complexes [Pd{(RO)₂PS₂}₂] (R = Et, Ph)

Molecular and crystal structures of the novel [Pd{(PhO)₂PS₂}₂] complex and the known [Pd{(EtO)₂PS₂}₂] complex are studied. According to the XRD data, [Pd{(RO)₂PS₂}₂] (R = Et, Ph) compounds crystallize in centrosymmetric space groups, and their crystal structures consist of mononuclear complex molecules. The \({{(\text{EtO})}_{2}}\text{PS}_{2}^{-}\) and \({{(\text{PhO)}}_{2}}\text{PS}_{2}^{-}\) ions perform an S,S′-donor bidentate-chelating function leading to the formation of square-planar PdS₄ coordination cores. The electronic absorption spectra of the solutions of these complexes are studied; the influence of the \({{(\text{RO})}_{2}}\text{PS}_{2}^{-}\) ligand structure and the solvent polarity on the observed optical properties of the studied compounds is considered.