Synthesis and crystal structure of the complex [MoW{μ-C 2(C 6H 4Me-4) 2}(CO) 4(η-C 5H 5){η 5-C 9H 6(COMe)-1}]: An unusual product of the reaction between [W(CC 6H 4Me 4)(CO) 2(η- 5H 5)] and [MoMe(CO) 3(η 5-C 9H 7)

Abstract

The compounds [W(CC 6H 4Me-4)(CO) 2(η-C 5H 5)] and [MoMe(CO) 3(η 5-C 9H 7)] (C 9H 7 = indenyl) react readily in toluene at 60°C to give the unusual dimetal complex [MoW{μ-C 2(C 6H 4Me-4) 2}(CO) 4(η-C 5H 5){η 5-C 9H 6(COMe)-1}], which has been structurally characterised by an X-ray diffraction study. The metal-metal bond [2.976(1) Å] is transversely spanned by the alkyne ligand C 2(C 6H 4Me-4) 2, formed by coupling of two carbyne fragments. The tungsten atom carries a cyclopentadienyl ring and two carbonyl groups. The molybdenum atom also has two carbonyl ligands, one of which semi-bridges the MoW bond [MoCO, 168.7(5)°]. Unexpectedly the indenyl group attached to the molybdenum centre carries a COMe substituent.