[(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

Abstract

A new triazole-based N-heterocyclic carbene cationic iridium(I) complex with a tetra­fluorido­borate counter-anion and hemi-solvating di­chloro­methane, [Ir(C₈H₁₂)(C₁₈H₁₅P)(C₈H₁₅N₃)][BF₄]·0.5CH₂Cl₂, has been structurally characterized.

A new triazole-based N-heterocyclic carbene Ir^I cationic complex with a tetra­fluorido­borate counter-anion and hemi-solvating di­chloro­methane, [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 di­chloro­methane solvent mol­ecule per two ion pairs. The cationic complex exhibits a distorted square-planar conformation around the Ir^I atom, formed by a bidentate cyclo­octa-1,5,diene (COD) ligand, a tri­phenyl­phosphane ligand, and an N-heterocyclic carbene (NHC). There are several close non-standard H⋯F hydrogen-bonding inter­actions that orient the tetra­fluorido­borate anions with respect to the Ir^I complex mol­ecules. The complex shows promising catalytic activity in transfer hydrogenation reactions. The structure was refined as a non-merohedral twin, and one of the COD mol­ecules is statistically disordered.

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