The ClCu(η^2-O~2) and ClCuNN complexes have been isolated by codeposition of laser ablated CuCl~2 or CuCl targets with O~2/Ar or N~2/Ar mixtures at 11K. Based on isotopic substituted experiments and DFT calculations, infrared absorptions at 1175.0cm^-^1 and 2296.3cm^- ^1 are assigned to O－O stretching mode of ClCu(η^2-O~2) and N－N stretching mode of ClCuNN, respectively. Theoretical calculations predicted ClCu(η^2-O~2) to be of C~2~v symmetry with a ^3B~1 ground state, and its dissociation energy with respect to CuCl + O~2 is estimated to be 52.3kJ/mol. For ClCuNN, it was found to be a linear molecule with a^1∑^+ ground state, and its dissociation energy is 85.3kJ/mol with respect to CuCl and N~2.

Key words: CUPROUS CHLORIDE, COPPER CHLORIDE, OXYGEN, NITROGEN, INFRARED SPECTROPHOTOMETRY