Abstract
Triphenylphosphine sulphide forms stable complexes with halides of PdII, PtII, PtIV, AuIII, AuI, and HgII. Triphenylphosphine selenide and triphenylarsine sulphide are generally similar but decompose with AuIII and PtIV, and triphenylstibine sulphide gives identifiable adducts only with copper(I) iodide and mercury(II) iodide. Ph3AsS extracts PtII from aqueous solution approximately seven times as fast as Ph3PSe, and sixteen times as fast as Ph3PS. The 1 : 1 adducts of HgCl2 with Ph3PS, Ph3PSe, and Ph3AsS are isomorphous with one another but not with dimeric (HgCl2,Ph3AsO)2. The P–S stretching frequency in Ph3PS falls by 40–50 cm.–1 on co-ordination, and the P–Se stretching frequency in Ph3PSe by about 20 cm.–1.
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