Synthesis and Properties of Organogermanium and Organotin Dithiophosphonate Complexes; Crystal Structures of (C₆H₅)₂Sn(Cl)[(p-MeOC₆H₄)(EtO)PS₂−S, S′], Me₂Sn[(p-MeOC₆H₄)(MeO)PS₂-S]₂, Me₂Sn[(p-MeOC₆H₄)(ⁱPrO)PS₂-S]₂, and Me₂Ge{[(C₆H₅)₃SiO](p-MeOC₆H₄)PS₂-S}₂

Abstract

2,4–Bis-(4-methoxyphenyl)-1,3,2λ⁵,4λ⁵-dithiadiphosphetane-2,4-disulfide (Lawesson's reagent) reacts with a variety of alcohols and silanols to form dithiophosphonic acids in a facile manner. Their lithium salts react with organotin- and organogermanium chlorides to produce organometallic dithiophosphonate complexes of the type A R₃“M[S(S)P(R)(OR′)] (M = Ge, Sn; R = 4-MeOC₆H₄; R′ = Me, SiPh₃, GePh₃, SnPh₃; R″ = Me, Ph) and B R₂”M[S(S)P(R)(OR′)]₂ (M = Ge, Sn; R = 4-MeOC₆H₄; R′ = Me, Et, ⁱ Pr, ^tBu, SiPh₃; R″ = Me, Ph). The ligands in the new organometallic compounds are bound in an asymmetric fashion as revealed by four X-ray structure determinations, containing one representative example of type A and three examples of type B . All new compounds are fully characterized by analytical and spectroscopic methods.

Keywords:

• Crystal structures
• dithiophosphonates
• germanium
• organometallic compounds
• tin