HETERONUCLEAR TRIANGULAR CLUSTERS OF THE TYPE [PT2M(MU(3)-ETA(1) UIVALENT-TO-CC-EQUIVALENT-TO-CPH)(CO)(5)(PPH3)(2)] (M = FE OR RU)/

The 46-electron heteronuclear clusters -eta(1):eta(1):eta(2)-PhC=CC=CP h)(CO)(5)(PPh3)(2)] (M = Fe or Ru) are formed in moderate yield by tre ating [Pt(eta(2)-PhC=CC=CPh)(PPh3)(2)] with [Fe(CO)(5)] or [Ru-3(CO)(1 2)] in refluxing toluene. The Pt2Fe and Pt2Ru clusters are isostructur al, being composed of two Pt(CO)(PPh3) units and a M(CO)(3) group link ed by two Pt-Fe or Pt-Ru bonds with the mu(3)-diyne coordinated throug h only one C=C bond.