The interaction of the dimethyltin(IV) and trimethyltin(IV) cations with the phosphomycin disodium salt, Na2[(1R, 2S)-1,2-epoxypropylphosphonate], has been investigated using potentiometric and UV–visible techniques at 25 ◦C and 0.1 M ionic strength (NaClO4) in aqueous solution. The species Me2SnLH+, Me2 SnL, Me2SnL2 2−, Me2 SnLOH− and Me2SnL(OH)2 2− (L = phosphomycinate2−) for dimethyltin(IV)–phosphomycinate, and the species Me3SnL−, and Me3SnLOH2− for trimethyltin(IV)–phosphomycinate systems were considered. The protonation of the phosphomycinate2− and formation constants of the complexes formed in solutionwere calculated using different computer programs. The speciation diagrams of the various complex species were evaluated as a function of pH. The involvement of different ligand functional groups in the binding to organotin(IV) is discussed.
Equilibria involved in the diorganotin(IV) and triorganotin(IV) phosphomycin interaction in aqueous solution.
SAMMARTANO, Silvio;
2007-01-01
Abstract
The interaction of the dimethyltin(IV) and trimethyltin(IV) cations with the phosphomycin disodium salt, Na2[(1R, 2S)-1,2-epoxypropylphosphonate], has been investigated using potentiometric and UV–visible techniques at 25 ◦C and 0.1 M ionic strength (NaClO4) in aqueous solution. The species Me2SnLH+, Me2 SnL, Me2SnL2 2−, Me2 SnLOH− and Me2SnL(OH)2 2− (L = phosphomycinate2−) for dimethyltin(IV)–phosphomycinate, and the species Me3SnL−, and Me3SnLOH2− for trimethyltin(IV)–phosphomycinate systems were considered. The protonation of the phosphomycinate2− and formation constants of the complexes formed in solutionwere calculated using different computer programs. The speciation diagrams of the various complex species were evaluated as a function of pH. The involvement of different ligand functional groups in the binding to organotin(IV) is discussed.Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.