Vibrational, 31P NMR and crystallographic studies of diiodine adducts of some bidentate tertiary phosphine sulfides

摘要: Treatment of bis(dipbenylphosphino)methane disulfide (dppmS) or bis(diphenylphosphino)ethane (dppeS) with diiodine in dichloromethane yields the adducts dppmS .I-4 1 and dppeS 2, respectively, whose structures have been solved by X-ray crystallography. Compounds 2 consist discrete molecular units containing bent P-S-I linear S . .I-I geometries that can be interpreted terms donation electron density from sulfur to diiodine. Consistent this interpretation, P-S bonds are lengthened compared unco-ordinated phosphine sulfides, I-I Both compounds therefore described as 'charge-transfer' complexes. The two moieties inequivalent having markedly different bond lengths angles. In both identical. structural features accordance Raman P-31 CP MAS NMR data.