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

The preparation of Ph2PNEtC(O)NEtPPh2 and Ph2PNMeC(S)NMePPh2 is reported. T he coordination chemistry of Ph2PNEtC(O)NEtPPh2, Ph2PNMeC(O)NMePPh2 and Ph2 PNMeC(S)NMePPh2 with Pt(II) and Pd(II) has been studied. The urea derivativ es react with MCl2(cod) (M = Pd, Pt) to give simple MCl2L complexes. Demons trative examples of simple chelate Mo(CO)(4)L and bimetallic. ClAu-L-AuCl c omplexes have also been prepared. However with Pd(OAc)(2) bimetallic compou nds [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(c od) to give [Pt{Ph2PN(Me)C(N(Me)HS)}Cl-2]., a true, heterocycle containing a PtSCNP ring. The new compounds have been characterised spectroscopically and the X-ray. structures of six complexes are reported.