Mixed-metal cluster chemistry.: Part 18. Synthesis and crystal structure of W3Ir3(μ4-η2-CO)(μ-CO)(CO)10(η-C5H4Me)3

Heating a mixture of W2Ir2(CO)10(η-C5H4Me)2 and 1,2-(E)-bis{4′-(oct-1′′-ynyl)phenyl}ethene in refluxing CH2Cl2 affords a complex mixture from which W3Ir3(μ4-η2-CO)(μ-CO)(CO)10(η-C5H4Me)3 can be separated in low yield. The crystallographically characterized title cluster is the first hexametallic Group 6–Group 9 mixed-metal cluster, possesses an unusual edge-bridged trigonal bipyramidal core geometry, and has a μ4-η2-CO ligand which has the longest carbonyl CO bond thus far.