IHALODICARBONYLRUTHENIUM(II)-BIS(TERTIARYPHOSPHINE CHALCOGENIDE) COMPLEXES

Reactions of 1,1-methylene bis(diphenylphosphine oxide or sulphide) (d pmO(2) or dpmS(2)) and 1-(diphenylphosphinoethyl)-2-diphenylphosphine sulphide (dpePS) with dihalodicarbonylruthenium(II) in EtOH gave 1:1 ( L:M) complexes of stoichiometry: Ru(CO)(2)X(2)L(2) (L = dpmO(2), dpmS( 2) or dpePS; X = Cl or Br), which were characterized by elemental anal ysis and i.r. spectroscopy. The spectra reveal that: (a) the carbonyls occupy octahedral cis-positions, and (b) dpmS(2) shows a higher coord ination shift than does dpePS, probably due to the better Lewis basici ty of the Ph(2)P moiety as compared to the Ph(2)P(S) moiety in the lig ands. Cis-octahedral geometries are inferred from these studies.