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 CO2 mole cules to give the insertion products OMCO, which have been isolated in soli d argon. The insertion OMCO- molecular anions (Cr through Cu) were formed b y electron capture and/or reaction with CO2-, and the addition MCO2- anions (M = Co, Ni, Cu) were produced by direct react:ion with CO2-. The excellen t agreement between the observed frequencies and isotopic frequency ratios with those calculated by density functional theory supports these assignmen ts.