Crystal Structure and Properties of Iridium(I)(1,5-Cyclooctadiene) (η⁵-Tetramethylcyclopentadiene) [Ir(cod)Cp^Me4]

Volatile iridium complex [Ir(cod)Cp^Me4] (Cp^Me4 is tetramettiylcyclopentadienyl, cod is 1,5-cyclooctadiene) is synthesized and characterized by IR and NMR spectroscopy methods. The complex is a solid phase under standard conditions and crystallizes in the form of colorless needle shaped crystals. The structure of [Ir(cod)Cp^Me4] is solved by X-ray diffraction: chemical formula IrC₁₇H₂₅, space group P-1, a = 6.4631(3) Å, b = 8.4620(4) Å, c = 13.5577(8) Å, α = 85.770(2)°, β = 84.611(2)°, γ = 78.013(2)°, V = 720.99(6) ų, Z = 2, d_calc = 1.942 g/cm³, μ = 9.240 mm⁻¹. Tetramethylcyclopentadienyl is a η⁵-coordinated ligand, 1,5-cyclooctadiene is a η⁴-coordinated ligand in the cis-cis conformation. According to the thermogravimetric data, the complex transfers to the gas phase congruently upon heating.