Citation: Jing Qu GUAN, Chen Ho TUNG. Photophysical Behaviors of Azobenzene in Solvent-Swollen Nafion Membranes[J]. Chinese Chemical Letters, ;1996, 7(10): 944-947. shu

Photophysical Behaviors of Azobenzene in Solvent-Swollen Nafion Membranes

Institute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101

Received Date: 12 June 1996

Fund Project: We thank the National Natural Science Foundation of China for financial support. We also thank Dr. A. W. -H. Mau of CSIRO, Division of Chemical and Polymers, Australia, for donation of Nafion 117 membrane.

The fluorescence from azobenzene (AB) molecule incorporated into water-swollen Nafion in acid form was observed at room temperature for the first time.The incorporation process was investigated by UV absorption.The plot of the concentration of AB in Nafion vs.the soaking time shows that the adsorption process is diffusion-controlled, and the apparent diffusion coefficient (D) was determined to be 7.6×10¹⁰cm²s^-1.These results are attributed to the fact that AB molecules are located in the fluorocarbon/water interface of the Nafion membranes and are protonated.In methanol-swollen Nafion membranes, AB fails to fluoresce because it is located at the methanol pool enclosed by the cluster networks.
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