Abstract
Dependence of the fluorescence-quenching rate constant k q , effective quenching distance r q , and free radical yield Φ R on the free enthalpy change ΔG f of full electron transfer has been studied in dichloromethane by using anthracenecarbonitriles as electron-accepting fluorescers and amino- and methoxybenzenes as electron-donating quenchers. On the basis of the present data in dichloromethane and the previous data in acetonitrile, the solvent effects on the electron-transfer fluorescence-quenching mechanism and on the back electron-transfer reaction within the geminate radical ion pairs are elucidated
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