Reaction between the tetrahedral cluster compound Mo2Ir2(CO)10(η5-C5H4Me)2 (1) and 1-iodo-4-(oct-1‘-ynyl)benzene afforded the pseudooctahedral cluster Mo2Ir2{μ4-η2-Me(CH2)5C2-4-C6H4I}(CO)8(η5-C5H4Me)2 (7). Similar reactions of 1 and W2Ir2(CO)10(η5-C5H4Me)2 (2) with di- and triynes afforded the related mono-, di-, and tricluster compounds [M2Ir2(CO)8(η5-C5H4Me)2]3{μ12-η6-Me(CH2)5C2-4-C6H4C2C6H4-4-C2(CH2)5Me}