Dithiophosphonic acid metal complexes

The dithiophosphonic acid monoesters, RP(OR )(S)SH can be conveniently prepared by cleavage of dimeric, cyclic diphosphetane disulfides, [RP(S)S]2 with alcohols, silanols, or trialkylsilylalcohols180 and then can be converted into metal complexes M[SPR(OR )]2 without isolation.181 The substituted ferrocenyl anion, (N3C6H4CH20)(CpFeC5H4)PS2 has been prepared in two steps from P4Sio, ferrocene and hydroxymethylbenzotriazole (and its salt was used for the preparation of some nickel and rhodium complexes).182 Zwitter-ionic ferrocenylditiophosphonates,... 

Various spectroscopic studies of metal dithiophosphonates have been performed. Thus, a comparative analysis of the IR spectra of metal complexes with dithiophosphoric, -phosphinic, and -phosphonic acids was conducted in the range of vibrational coupling of phosphorus with sulfur. The substitution of alkoxy groups by alkyls produces a low frequency shift of the //(PS) band absorption. The change of //(PS) frequency agrees with changes of donor properties of the ligand.117... 

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