{[Ir(CO) 2PPh 3] 2-μ-HC 2Ph}. An alkyne derivative of [Ir(CO) 3PPh 3] 2

Abstract

The reaction of [Ir(CO) 3PPh 3] 2 with phenylacetylene in boiling CH 2Cl 2 yields the dinuclear iridium complex {[Ir(CO) 2PPh 3] 2-μ-HC 2Ph}. The molecule has an approximate C s symmetry and contains a quasi-tetrahedral moiety Ir 2C 2 involving two alkyne carbon atons; the CC distance in the μ-bonded acetylenic ligand 1.412(17) Å is the longest ever observed in dimetal-μ-alkyne complexes.