Diphosphine derivatives: Part 5. Ligand behaviour and vibrational spectra of coordinated tetraalkyl-1,2-dithioxodi-λ5-phosphanes (tetraalkyldiphosphine disulphides) |
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Authors: | Geoffrey P McQuillan Ian A Oxton |
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Institution: | Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB9 2UE Gt. Britain |
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Abstract: | Vibrational data are reported for complexes of tetraethyl-,tetrapropyl-and tetrabutyl-1,2-dithioxodi-λ5-phosphanes (tetraalkyldiphosphine disulphides) P2R4S2 with zinc, cadmium, mercury and cobalt halides. The P—P stretching frequencies in the coordinated ligands occur near 500 cm?1, substantially higher than in the corresponding P2Me4S2 complexes, most probably because of interactions with P—C—C deformation modes. In the F—C stretching region the spectra of the P2Et4S2 complexes are consistent with (but do not necessarily prove) cis-chelate ligand geometry with Zn, Cd and Co halides, and gauche-chelate geometry with Hg halides. No M—S stretching vibrations can be identified above 250cm?1. |
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