Using the pillar-shaped architecture of pillar[5]arenes, we constructed microporous multilayer films with azobenzene groups on the top surface by layer-by-layer assembly of cationic and anionic pillar[5]arenes. Guest uptake, storage, and release by the microporous films were regulated through photoreversible isomerization of azobenzene groups attached to the pore outlets. Azobenzene was regarded as a "molecular valve" to control guest access: the trans form of the azobenzene acted as an open valve, allowing guest-free access from/to the micropores. Conversely, the cis form of the azobenzene behaved as a closed valve, completely blocking guest access from/to the micropores. Photoresponsive reversible uptake, storage, and release of guest molecules were demonstrated through photoisomerization of the azobenzene valves by irradiation with ultraviolet and visible light.

中文翻译：

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偶氮苯改性柱[5]芳烃微孔多层膜的光控可逆客体吸收、储存和释放

利用柱[5]芳烃的柱状结构，我们通过阳离子和阴离子柱[5]芳烃的逐层组装构建了在顶面具有偶氮苯基团的微孔多层薄膜。微孔薄膜的客体吸收、储存和释放通过附着在孔出口上的偶氮苯基团的光可逆异构化进行调节。偶氮苯被认为是控制客体进入的“分子阀”：偶氮苯的反式作为一个开放的阀门，允许客体自由进入/进入微孔。相反，偶氮苯的顺式形式表现为一个关闭的阀门，完全阻止客体进入/进入微孔。光响应可逆摄取、储存、