Chemistry of vinylidene complexes. XIII. The reaction between Cp(CO)(2)MnPt(mu-C = CHPh)(eta(2)-dppm) and Fe-2(CO)(9): simultaneous formation of the mu(3)-vinylidene MnFePt and mu(4)-vinylidene PtFe3 clusters. Crystal structure of (eta(5)-C5H5)MnFePt(mu(3)-C = CHPh)(CO)(6)[eta(1)-Ph2PCH2P(= O)Ph-2]

The reaction between [Cp(CO)(2)MnPt(mu-C=CHPh)(eta(2)-dppm)](1) (1) and [Fe -2(CO)(9)] gives heterometallic MnFePt and PtFe3 vinylidene clusters 2-4, i n which diphosphine ligands are coordinated to metal cores in three differe nt modes. In [(eta(2)-dppm) PtFe3(mu(4)-C=CHPh)(CO)(9)] (2) the Pt atom is chelated by dppm while in [CpMnFePt(mu 3-C=CHPh)(mu-dppm)(CO)(5)] (3) dppm bridges the Pt-Fe bond. Complex 3 was shown to exist in two isomeric forms. The novel complex {CpMnFePt(mu(3)-C=CHPh)(CO)(6)[eta(1)- -Ph2PCH2P(=O)Ph-2 ]} (4), characterized by X-ray diffraction study, possesses a trimetallic c hain core. The diphosphine ligand in 4 links to platinum by only one of pho sphorus atoms whereas the second P atom is uncoordinated and oxidized to th e phosphineoxide group. (C) 1999 Elsevier Science S.A. All rights reserved.