Transparent photochromic films were conveniently prepared by incorporating two different cationic diarylethenes into an ion-exchange Nafion film. The colorless films changed to dark blue or violet upon UV light irradiation, and subsequently switched to colorless under visible light. The films exhibited high photochromic durability compared with that in solution. The diarylethene molecules were also significantly more stable to photochromic reaction in the Nafion film than in the solution state.

中文翻译：

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包含阳离子二芳烃的光致变色nafion膜

通过将两种不同的阳离子二芳基醚掺入离子交换Nafion膜中，可以方便地制备透明的光致变色膜。在紫外光照射下，无色膜变为深蓝色或紫色，随后在可见光下变为无色。与溶液相比，该膜表现出高的光致变色耐久性。与溶液状态相比，Nafion膜中的二芳基乙烯分子对光致变色反应的稳定性也明显更高。