The photochemical reactions of azobenzene (AB) incorporated into different solvent-swollen Nafion membranes were investigated. The location of azobenzene in water-swollen Nafion membranes was different from that in methanol-swollen Nafion membranes, which was responsible for the different photochemical reactions of AB. In methanol-swollen Nafion membranes only trans↔cis isomerization took place, while in water-swollen Nafion membranes photochemical cyclization of AB occurred after rapid trans↔cis isomerization. The relation between the relative quantum yields and the light intensity showed that the cyclization was a two-photo process. The numbers of AB molecules per cluster (n_AB/cluster) in Nafion membranes with different AB concentrations and different water contents were calculated. Under the experimental condition two competitive photocyclization mechanisms were suggested by n_AB/cluster in Nafion membranes, relative quantum yields of the cyclization, and the change of the ratio of benzidine to benzo[c]cinnoline.

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Volume14, Issue6

November 1996

Pages 541-548

Photochemical reaction of azobenzene in solvent-swollen Nafion membranes

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Photochemical reaction of azobenzene in solvent-swollen Nafion membranes

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