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A series of bridged diphosphinothioyl bidentate ligands has been synthesized and several have been found to form stable complexes with a number of "class b" metal halides. The infrared spectra indicate that the ligands form six-membered ring chelates by coordination ziia both thiophosphoryl donor sites. The sulfur-bridged ligands undergo cleavage to yield phosphorodithioate complexes.

The preparation, infrared spectra in the carbonyl stretching region, and phophorus-31 nmr spectra of nine "mixed" phophorus ligand derivatives of the group VI metal carbonyls are reported. In the two compounds which have phosphorus atoms in cis positions, the phosphorus-phosphorus spin-spin coupling constant is considerably smaller than for those corresponding situations with trans phosphorus atoms.