Spectroscopic Study of the Conformational Dependence on Acid Dissociation of Phenoxypyridinium Cations.

Thermodynamic constants for acid dissociation of the 2-, 3-, and 4-phenoxypyridinium, and 2-(2,6-xylyloxy)pyridinium cations were estimated by the spectroscopic method, and are extensively discussed in relation to the conformations around the bridging oxygen atom and the electronic states.

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