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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

Journal of Organometallic Chemistry
Publication Date
DOI: 10.1016/0022-328x(87)87131-0


Abstract The compound Co 3(μ 2-CPh)(CO) 9 ( 1) reacts with Na 2[Fe(CO) 4] in tetrahydrofuran to afford the mixed-metal hydride cluster HFeCo 2(μ 3-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 P 1 ( Z = 4) with a 8.034(3), b 15.760(7), c 15.900(7) Å, α 101.11(3), β 100.99(3), γ 100.13(3)°, 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) Å, β 96.13(3)°. The two structures are similar, with a M 3 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 FeCo 2(μ-AuPPh 3)(μ 3-CPh)(CO) 9 ( 3), which was synthesized in toluene by a direct reaction of 2 with Au(PPh 3)Cl in the presence of TlPF 6, indicates that the hydride ligand is in an edge bridging position. The cluster 3 crystallizes in space group Pna2 1 ( Z = 4) with a 34.617(6), b 8.793(2), c 11.226(2) Å.

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