Abstract
The photoreduction of methylviologen (MV 2+ ) was examined in zeolite X. A series of alkali metal ion-exchanged zeolite X materials with ion-exchanged methylviologen was photoionized with 320 nm light at room temperature in the absence of any reducing counteranion. Photoreduction of methylviologen containing alkali metal ion-exchanged zeolite X results in the formation of methylviologen cation radicals (MV + ). The radicals were identified by electron spin resonance (ESR). Upon irradiation at room temperature the samples turn light blue in color and a single line ESR spectrum characteristic of the methylviologen radical cation is observed. The photoyield depends on the nature of the alkali metal ion-exchanged into the zeolite framework. The photoyield increases in the order Li-X/MV 2+ 2+ 2+ 2+ 2+ . The donor strength of the zeolite framework increases in the order Li-X
Published Version
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