Synthesis and crystal structure of the iridium(I) carbene complex with a pair of hydrogen wing tips

Abstract

The iridium(I) cyclooctadiene complex with two (3-tert-butylimidazol-2-ylidene) ligands [(H-Im t Bu)2Ir(COD)]+PF 6 − (C22H32PF6IrN4) has been prepared, and its crystal structure is determined by X-ray diffraction. Complex exhibits slightly distorted square planar configurations around the metal atom, which is coordinated by two H-Im t Bu ligands and one cyclooctadiene group. The new iridium carbene complex has a pair of hydrogen wing tips. The Ir−Ccarbene bond lengths are 2.066(5) and 2.052(5) A, and the bond angle C−Ir−C between these bonds is 95.54(19)°. The dihedral angle between two imidazol-2-ylidene rings is 86.42°.