Synthesis and structure of the trimolybdenum cluster [(CpMoCl)3(μ-Cl)4(μ3-O)]

Audrey Cole (1) , John Gordon (1) , Malcolm Kelland (1) , Rinaldo Poli (1) , Arnold Rheingold (2)

1 University of Maryland [College Park]
2 University of Delaware [Newark]

The title compound Is obtained from CpMoCI3 in warm THF. The source of the oxygen atom is the solvent, the byproduct being 1,4-dichlorobutane. The structure shows a triangular array of molybdenum atoms without direct metal-metal bonds. Each atom bears one cyclopentadienyl group and a terminal Cl ligand, and four additional Cl atoms edge-bridge the triangular unit, two on one edge and the others one each on the two remaining edges. The oxygen atom is bonded to all three Mo atoms to complete a pseudooctahedral geometry for two metals and a four-legged piano stool geometry for the other metal. Crystal data: monoclinic, P21/m, a= 7.950 (2) Å, b = 13.442 (4) Å, c = 10.049 (4) Å, ß = 97.87 (3)°, V = 1063.7 (6) Å 3, Z = 2, and R = 2.98%. The solidstate structure is consistent with the magnetic susceptibility and with the 1H-NMR spectrum of the compound. These indicate that two unpaired electrons are localized on the electronically unsaturated unique metal.

Domaines: Chimie de coordination; Cristallographie

Audrey Cole, John Gordon, Malcolm Kelland, Rinaldo Poli, Arnold Rheingold. Synthesis and structure of the trimolybdenum cluster [(CpMoCl)3(μ-Cl)4(μ3-O)]. Organometallics, 1992, 11 (4), pp.1754-1757. ⟨10.1021/om00040a055⟩. ⟨hal-03535107⟩