Chemistry of vinylidene complexes: XIV. Synthesis and NMR and IR study of heterometallic PdMn, PdFe2, and PdFe3 complexes with Ph2PCH2CH2PPh2 chelating ligand

The reaction of eta(5)-cyclopentadienyl(phenylvinylidene)(dicarbonyl)mangan ese (I) with tetrakis-(triphenylphosphine)palladium yielded the binuclear c omplex eta(5)-cyclopentadienyl(dicarbonyl)manganese-palladium palladium(mu- phenylvinylidene) [bis(triphenylphosphine)] (II), which transforms to eta(5 )-cyclopentadienyl(di-carbonyl) manganesepalladium(mu-phenylvinylidene)[bis (diphenylphosphino)ethane] (III) on the replacement of two triphenylphosphi ne ligands by chelating bis(diphenylphosphino)ethane. Reaction of III with iron nonacarbonyl gave three new heterometallic clusters: (nonacarbonyl)(mu (4)-phenylvinylidene)[bis(diphenylphosphino)ethane]triironpalladium (IV), ( octacarbonyl)[bis(diphenylphosphino)ethane] (V), and eta(5)-cyclopentndieny l(octacarbonyl)(mu(3)-phenylvinylidene) manganesediiron (VI). Compounds wit h the MnPd, PdFe2, PdFe3, and MnFe2 cores were studied by NMR and LR spectr oscopy and by electrochemical methods.