Synthesis and structural characterization of {μ3-H(Ph)CC}FeCo2(CO)7dppm (dppm=Ph2PCH2PPh2) and {μ3-H(Ph)CC}FeCo2(CO)9−nLn [L=PPh3 (n=1, 2), AsPh3 (n=1)]

The new mixed-metal clusters {μ3-H(Ph)CC}FeCo2(CO)7dppm (dppm=Ph2PCH2PPh2) (1) and {μ3-H(Ph)CC}FeCo2(CO)9−nLn [L=PPh3, n=1 (2), n=2 (3); AsPh3, n=1 (4)] have been synthesized by facile substitution reactions. The molecular structures of 1, 2 and 4 have been determined by single-crystal X-ray analysis; dppm replaces two equatorial carbonyls from two Co(CO)3 groups, and PPh3 and AsPh3 replace one equatorial carbonyl from a Co(CO)3 group, respectively. The new compounds were characterized by IR, 1H-, 31P- (for 1–3) NMR and MS. Cyclic voltammetric behavior for 1, 2 and 4 was investigated, and the results show the order of σ-donator ability is CO