Infrared spectrum of the chloromethylene hydroperoxide cation in solid argon

Infrared spectrum of the chloromethylene hydroperoxide cation, HC(Cl)OOH+ in solid argon is reported. The cation is produced by co-condensation of dichloromethane and dioxygen mixtures with high-frequency discharged argon at 4 K followed by visible light excitation. On the basis of isotopic substitutions as well as quantum chemical frequency calculations, absorptions at 3452.7, 3052.0, 1499.6, 976.9, 855.4 and 956.1 cm−1 are assigned to the O–H, C–H, CO, C–Cl and O–O stretching and out-of-plane CH wagging vibrations of the chloromethylene hydroperoxy cation. The cation was predicted to have a singlet ground state with planar Cs symmetry.