Synthesis and characterization of chiral (μ3-S)FeCoM(CO)8(RCp) [M = Mo, W; R = C6H5C(O), CH3OC(O)C6H4C(O)] clusters and the crystal structures of (μ3-S)FeCoMo(CO)8[CH3OC(O)C6H4C(O)Cp] and (μ3-S)FeCoW(CO)8[CH3OC(O)C6H4C(O)Cp]

Several chiral cluster derivatives [(mu(3)-S)FeCoM(CO)(8)(RCp)] [M = Mo, R = C6H5C(O) (2); M = Mo, R = CH3OC(O)C6H4C(O) (3); M = W, R = C6H5C(O) (4), M = W, R = CH3OC(O)C6H4C(O) (5)] were synthesized by the thermal reaction of (u(3)-S)FeCo2(CO)(9) (1) with the functionally substituted cyclopentadienyl tricarbonyl metal complex anions [M(CO)(3)RC(O)Cp](-) without using benzophenone ketyl to initiate the reaction. The cluster (2) reacted with NaBH4 in MeOH gave the secondary alcohol cluster (mu(3)-S) FeCoMo(CO)(8)C6H5CH(OH)Cp. These clusters were characterized by C/H analysis, IR, H-1 NMR, C-13 NMR and MS. The results showed that the metal fragment Co(CO)(3) in (mu(3)-S)FeCo2(CO)(9) could be exchanged by M(CO)(2)RC(O)Cp. The structures of (mu(3)-S)FeCoMo[CH3O(O)C6H4C(O)Cp] (4) and (mu(3)-S)FeCoW(CO)(8) [CH3OC(O)C6H4C(O)Cp] (5) were determined by single crystal X-ray diffraction. (C) 1997 Elsevier Science Ltd.