| Abstract: | The anions of thiophosphinic and selenophosphinic acids R2P(X) YH (X = S, Se; Y = O, S, Se) can act as bidentate ligands. They combine with many metals to form complexes containing a four-membered chelate ring, or to give coordination polymers in which they form ligand bridges. The preparation, properties, and reactions of these compounds, as well as the dielectric properties and analytical use of dithiophosphinato complexes, which are also of industrial interest, are described. Some thiophosphinato and selenophosphinato complexes exhibit concentration-dependent association via ligand bridges. Evidence of the chelate nature of the ligands R2P(X)Y? was obtained from IR spectroscopic studies. The ligand field parameters of the anion (C2H5)2P(S)S? were deduced from the electronic spectra of octahedral diethyldithiophosphinato complexes, and the position of the ligand in the spectrochemical and nephelauxetic series were determined from these parameters. |
