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UV photofragmentation of gas phase M and M2 complexes with ketones, where M = Cu and Ag

Results are reported of an experimental study of the UV photofragmentation patterns of singly and doubly charged complexes consisting of either copper or silver in association with a series of ketones. Considerable variation is seen in response to photoexcitation, ranging from extensive chemical reactivity in the case of Cu+ through to no evidence of photoabsorption on the part of Ag2+ complexes. It is concluded that the close proximity of a charge has a considerable influence on energy of the non-bonding electrons of the carbonyl group in the ketones, and that this, in turn, influences the π* ← n electronic transition promoted at UV wavelengths.