Studies on Some Organometallic Compounds of Pt(O) and Rh(l)

Department of Chemistry, Patna University, Patna-800 005 Manuscript received 29 March 1982, revised 23 November 1982, accepted 16 February 1983 Starting from [Pt(P\(\phi\)3)4], three new platinum(O) complexes, [Pt(P\(\phi\)3 )(ETU)(H2O)4], [Pt(P\(\phi\)3)(ETU)3] and [Pt(P\(\phi\)3)(ETU)5] have been prepared. Similarly, a new Rh(l) complex, [Rh(ETU)2(P\(\phi\)3)Cl].6H2O has been prepared from the complex [Rh(P\(\phi\) 3)2 Cl] in benzene medium. The oxidation states of the metal ions in these complexes have been checked by iodometric titration. Infrared spectra of the complexes, recorded in the range of 4000-200 cm-1, indicate that [Pt(P\(\phi\)3)(ETU)(H2O)4], [Pt(P\(\phi\)3)(ETU)5] may be octahedral, [Pt(P\(\phi\) )(ETU)3] may be tetrahedral and [Rh(ETU)2(P\(\phi\)3)CI].6H2O may have a square planar structure. Metal-ligand vibrations have also been assigned. The study indicates that [Pt(P\(\phi\)3)4] and [Rh( P\(\phi\)3)3CI] undergo substitution reaction in benzene medium and all but one bonded P\(\phi\)3 groups are replaced by ethylene thiourea (ETU) molecule. In all the complexes, the ETU molecule is bonded to the central metal ion through sulphur only