Infrared Spectra of OMCO (M = Cr−Ni), OMCO- (M = Cr−Cu), and MCO2- (M = Co−Cu) in Solid Argon

Laser-ablated late transition metal atoms Cr through Ni react with CO 2 molecules to give the insertion products OMCO, which have been isolated in solid argon. The insertion OMCO - molecular anions (Cr through Cu) were formed by electron capture and/or reaction with CO 2 -, and the addition MCO 2 - anions (M = Co, Ni, Cu) were produced by direct reaction with CO 2 - . The excellent agreement between the observed frequencies and isotopic frequency ratios with those calculated by density functional theory supports these assignments.