The relative intensities of C–O stretching absorptions in the infrared spectra of some pentacarbonylmanganese(I) derivatives

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Abstract
An explanation is offered for the relative absorption intensities of the two a1 C–O stretching vibrations for compounds of general formula XM(CO)5. The combined effects of coupling and distortion of bond angles at the metal atom away from 90° are thought to be responsible for variations in the intensity ratio of the two modes.