Abstract
Reaction of Lawesson's reagent ( 1) with Pt(C 2H 4)(PPh 3) 2 in benzene gives cis-Pt{S 2P(S)(C 6H 4OMe)}(PPh 3) 2 ( 2), in 63% yield. ( 2) was characterised by IR, 31P NMR and X-ray crystallography: monoclinic, space group P2 1/ c with a = 10.489(3), b = 18.373(7) and c = 22.591(9) Å, β = 91.34(3)°. The molecule has square planar platinum co-ordination with non-equivalent PtS bond lengths [2.369(2), 2.351(2) Å] and a folded (19.4° dihedral angle) PtS 2P ring. The PS bond lengths are equal.
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