Intermolecular hydrogen bonding to transition metal centres; infrared spectroscopic evidence for O–H ⋯ Ir bonding between [(η5-C5Me5)Ir(CO)2] and fluoroalcohols in solution at room temperature

Abstract

IR spectra in the ν(C–O) and ν(O–H) regions provide strong evidence for intermolecular H-bonding to the iridium centre of [cp*Ir(CO)₂](cp*=η⁵-C₅Me₅) from sterically crowded perfluoroalcohols, e.g.(C₃F₇)(CF₃)₂COH and (CF₃)₂CHOH; the interactions are sufficiently strong, ΔH°=–26 to –28 kJ mol^–1, to be observed at room temperature in n-heptane solution.