The preparation and coordination chemistry of phosphorus(iii) derivatives of dialkyl ureas and thioureas

Abstract

The preparation of Ph₂PNEtC(O)NEtPPh₂ and Ph₂PNMeC(S)NMePPh₂ is reported. The coordination chemistry of Ph₂PNEtC(O)NEtPPh₂, Ph₂PNMeC(O)NMePPh₂ and Ph₂PNMeC(S)NMePPh₂ with Pt(II) and Pd(II) has been studied. The urea derivatives react with MCl₂(cod) (M = Pd, Pt) to give simple MCl₂L complexes. Demonstrative examples of simple chelate Mo(CO)₄L and bimetallic ClAu–L–AuCl complexes have also been prepared. However with Pd(OAc)₂ bimetallic compounds [PdOPh₂{N(Me)C(O)N(Me)PPh₂}]₂ containing hydrolysed ligands (P–N bond cleaved) are formed. Furthermore the thiourea compound reacts with PtCl₂(cod) to give [Pt{Ph₂PN(Me)C(N(Me)HS)}Cl₂], a true heterocycle containing a PtSCNP ring. The new compounds have been characterised spectroscopically and the X-ray structures of six complexes are reported.