Light-Powered Reversible Guest Release and Uptake from Zn4L4 Capsules,Journal of the American Chemical Society

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Light-Powered Reversible Guest Release and Uptake from Zn4L4 Capsules
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-02-08 , DOI: 10.1021/jacs.2c10084
Amit Ghosh ₁ , Laura Slappendel ₁ , Bao-Nguyen T Nguyen ₁ , Larissa K S von Krbek ₁ , Tanya K Ronson ₁ , Ana M Castilla ₁ , Jonathan R Nitschke ₁

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A strategy for light-powered guest release from a tetrahedral capsule has been developed by incorporating azobenzene units at its vertices. A new Zn₄L₄ tetrahedral capsule bearing 12 diazo moieties at its metal-ion vertices was prepared from a phenyldiazenyl-functionalized subcomponent and a central trialdehyde panel. Ultraviolet irradiation caused isomerization of the peripheral diazo groups from the thermodynamically preferred trans configuration to the cis form, thereby generating steric clash and resulting in cage disassembly and concomitant guest release. Visible-light irradiation drove cage re-assembly following re-isomerization of the diazo groups to the trans form, resulting in guest re-uptake. A detailed ¹⁹F NMR study elucidated how switching led to guest release: each metal vertex tolerated only one cis-azobenzene moiety, with further isomerization leading to cage disassembly.

中文翻译：

Zn4L4 胶囊的光动力可逆客体释放和吸收

通过在四面体胶囊的顶点结合偶氮苯单元，开发了一种从四面体胶囊释放光动力客体的策略。由苯基二氮烯基官能化的子组分和中心三醛板制备了在其金属离子顶点处具有12个重氮部分的新型Zn ₄ L ₄四面体胶囊。紫外线照射导致外围重氮基团从热力学上优选的反式构型异构化为顺式构型，从而产生空间冲突并导致笼分解并伴随客体释放。重氮基团重新异构化为反式后，可见光照射驱动笼重新组装，导致客体重新摄取。一项详细的¹⁹ F NMR 研究阐明了转换如何导致客体释放：每个金属顶点仅耐受一个顺式偶氮苯部分，进一步异构化导致笼分解。

更新日期：2023-02-08

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