[(1,2,5,6-η)-Cycloocta-1,5-diene](1-ethyl-4-isobutyl-1,2,4-triazol-5-ylidene)(triphenylphosphane)iridium(I) tetrafluoridoborate dichloromethane hemisolvate

A new triazole-based <i>N</i>-heterocyclic carbene Ir^I cationic complex with a tetra-fluorido-borate counter-anion and hemi-solvating di-chloro-methane, [Ir(C₈H₁₂)(C₈H₁₅N₃)(C₁₈H₁₅P)]BF₄·0.5CH₂Cl₂, 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^I atom, formed by a bidentate cyclo-octa-1,5,diene (COD) ligand, a tri-phenyl-phosphane ligand, and an <i>N</i>-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^I 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.