Deactivation Behaviour of Arenes and Heteroarenes. XVII. Fluorescence Quenching of Cations by Anions
Fluorescence quenching, caused by cation‐anion interaction in the excited state, was investigated for the combinations of 13 acridinium and acridizinium ions (fluorophors) and chloride, bromide and iodide (quenchers). The obtained dependence of rate constants of dynamic quenching process on the acceptor properties of cations in the case of chloride is interpreted by the model of electron transfer in the encounter state. The resulting limit‐rate constants of quenching are greater than those of diffusion of neutral molecules, caused by the Coulomb‐interaction between cation and anion.
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