Ghosh, Amit, Slappendel, Laura, Nguyen, Bao-Nguyen T., von Krbek, Larissa K. S. ORCID: 0000-0002-4278-5235, Ronson, Tanya K. ORCID: 0000-0002-6917-3685, Castilla, Ana Maria ORCID: 0000-0002-5895-6190 and Nitschke, Jonathan R. ORCID: 0000-0002-4060-5122 (2023) Light-powered reversible guest release and uptake from Zn4L4 capsules. Journal of the American Chemical Society AU, 145 (7). pp. 3828-3832. ISSN 2691-3704 (Print), 1520-5126 (Online) (doi:https://doi.org/10.1021/jacs.2c10084)

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	anions; electromagnetic radiation; encapsulation; irradiation; nuclear magnetic resonance spectroscopy
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Science (SCI)
Last Modified:	27 Jun 2023 10:50
URI:	http://gala.gre.ac.uk/id/eprint/41473

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