Novel higher nuclearity osmium–antimony clusters by alkene- or diene-assisted cluster condensation

The reaction of the cluster Os3(μ-SbPh2)(μ-H)(μ3,η2-C6H4)(CO)9, 1, with a number of alkenes and dienes led to cluster condensation to afford the novel cluster Os5(μ4-Sb)(μ-SbPh2)(μ-H)2(μ3,η2-C6H4)(μ,η2-C6H4)(CO)14, 3, as the major product, and another novel cluster Os5(μ4-Sb)(μ-SbPh2)(μ-H)(μ3,η6-C6H4)(CO)14(Ph), 4. Reaction of 3 with the Group 15 ligands EPh3 (E = P, As, Sb) afforded the corresponding monosubstituted derivatives Os5(μ4-Sb)(μ-SbPh2)(μ-H)2(μ3,η2-C6H4)(μ,η2-C6H4)(CO)13(EPh3), 6.