Synthesis and structural characterization of {#mu#_3-H(Ph)C=C}FeCo_2(CO)_7dppm (dppm = Ph_2PCH_2PPh_2) and {#mu#_3-H(Ph)C=C}FeCo_2(CO)_(9-n)L_n [L = PPh_3 (n = 1, 2), AsPh_3 (n = 1)]

摘要

The new mixed-metal clusters {#mu#_3-H(Ph)C=C}FeCo_2(CO)_7dppm (dppm = Ph_2PCH_2PPh_2) (1) and {#mu#_3-H(Ph)C=C}FeCo_2(CO)_(9-n)L_n [L = PPh_3 n = 1 (2), n = 2 (3); AsPh_3, 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 carbonyl from two Co(CO)_3 groups, and PPh_3 and AsPh_3 replace one equatorial carbonyl from a Co(CO)_3 group, respectively. the new compounds were characterized by IR, ~1H-, ~(31)P- (for 1-3) NMR and MS. Cyclic voltammetric behavior for 1, 2 and 4 was investigated, and the results show the order of #sigma#-donator ability is CO < PPh_3 < AsPh_3 < dmmp.