MIXED-METAL CLUSTER DERIVATIVES OF Co3(μ3-CPh)(CO)9: CRYSTAL STRUCTURES OF Co3(μ3-CPh)(CO)9, HFeCo2(μ3-CPh)(CO)9, AND FeCo2(μ-AuPPh3)(μ3-CPh)(CO)9

Article abstract of DOI:10.1016/0022-328X(87)87131-0

The compound Co3(μ3-CPh)(CO)9 (1) reacts with Na2 in tetrahydrofuran to afford the mixed-metal hydride cluster HFeCo2(μ3-CPh)(CO)9 (2) after acid treatment.The structures of 1 and 2 have been determined by X-ray diffraction.The cluster 1 crystallizes in space group P1 (Z=4) with a 8.034(3), b 15.760(7), c 15.900(7) Angstroem, α 101.11(3), β 100.99(3), γ 100.13(3) deg, and the cluster 2 in the space group C2/c (Z=8) with a 14.114(4), b 7.804(3), c 33.844(12) Angstroem, β 96.13(3) deg.The two structures are similar, with a M₃ triangle triply bridged by the alkylidyne carbon atom and with three terminal carbonyl ligands bonded to each metal atom.The hydride ligand in 2 could not be located from the difference Fourier maps, but the structure of its gold triphenylphosphine derivative FeCo2(μ-AuPPh3)(μ3-CPh)(CO)9 (3), which was synthesized in toluene by a direct reaction of 2 with Au(PPh3)Cl in the presence of TlPF6, indicates that the hydride ligand is in an edge bridging position.The cluster 3 crystallizes in space group Pna2₁ (Z=4) with a 34.617(6), b 8.793(2), c 11.226(2) Angstroem.