[(1,2,5,6-η)-Cyclo-octa-1,5-diene](1-ethyl-4-iso-butyl-1,2,4-triazol-5-yl-idene)(tri-phenyl-phosphane)iridium(I) tetra-fluorido-borate di-chloro-methane hemisolvate.

A new triazole-based -heterocyclic carbene Ir cationic complex with a tetra-fluorido-borate counter-anion and hemi-solvating di-chloro-methane, [Ir(CH)(CHN)(CHP)]BF·0.5CHCl, has been synthesized and structurally characterized. There are two independent ion pairs in the asymmetric unit and one di-chloro-methane solvent mol-ecule per two ion pairs. The cationic complex exhibits a distorted square-planar conformation around the Ir atom, formed by a bidentate cyclo-octa-1,5,diene (COD) ligand, a tri-phenyl-phosphane ligand, and an -heterocyclic carbene (NHC). There are several close non-standard H⋯F hydrogen-bonding inter-actions that orient the tetra-fluorido-borate anions with respect to the Ir complex mol-ecules. The complex shows promising catalytic activity in transfer hydrogenation reactions. The structure was refined as a non-merohedral twin, and one of the COD mol-ecules is statistically disordered.