Ionization and appearance potential measurements in arene chromium tricarbonyls

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Abstract

The ionisation potentials and the appearance potentials for ions arising from the loss of carbonyl groups as well as certain other low-energy fragmentation ions have been measured for a series of substituted arene chromium tricarbonyls. The values obtained are found to correlate very well, for the loss of one and two carbonyl groups, with both the CO force constant k and the Hammett σp function and substituent on the benzene ring. The appearance potentials of the ions arising by the loss of three carbonyl groups do not exhibit a high correlation. Arene+ ions are found to occur at energies intermediate between those for the loss of two and three carbonyl groups. The various effects observed are discussed in terms of a model which involves definite contributions from both σ- and π- bonding of carbonyl groups in the gaseous cations. © 1973.

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Gilbert, J. R., Leach, W. P., & Miller, J. R. (1973). Ionization and appearance potential measurements in arene chromium tricarbonyls. Journal of Organometallic Chemistry, 49(1), 219–225. https://doi.org/10.1016/S0022-328X(00)84957-8

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