A 31P nuclear magnetic resonance spectroscopic study of some 2:1,3:1, and 4:1 complexes of phosphine sulfides and selenides with cadmium(II), including some complexes with mixed ligands

Using low-temperature 31P nmr, many new complexes formed between divalent cadmium (as Cd(SbF6)2) and monodentate phosphine chalcogenides in liquid SO2 have been characterized. A 4:1 (L:M) complex is formed with Bu′3PS and, possibly, Bu′3PSe. 4:1 and 3:1 complexes are formed with Ph3PE, (o-C6H4Me)Ph2PE, (p-C6H4Me)3PE, and (C6H11)3PE (E = S or Se) as well as (o-C6H4Me)2PhPSe, while 4:1, 3:1 and 2:1 complexes occur for (o-C6H4Me)3PE (E = S or Se), and, probably, (o-C6H4Me)2PhPS. In addition, ail the mixed ligand complexes in the series [Cd(SeP(C6H11)3)n(SP(C6H11)3)4–n]2+, [Cd(SeP(C6H11)3)n(SP(C6H11)3)3–n]2+, and [Cd(SeP(o-C6H4Me)3)n(SP(o-C6H4Me)3)3–n]2+ have been identified.Trends in the 31P nmr data are discussed.