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Issue 31, 2020
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An atropisomeric M2L4 cage mixture displaying guest-induced convergence and strong guest emission in water

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Abstract

Introduction of atropisomeric axes into a bent bispyridine ligand leads to the quantitative formation of a complex mixture of atropisomeric M2L4 cages upon treatment with metal ions. Whereas the isomer ratio of the obtained cage mixture, consisting of up to 42 isomers, is insensitive to temperature and solvent, the quantitative convergence from the mixture to a single isomer is accomplished upon encapsulation of a large spherical guest, namely fullerene C60. The observed isomerization with other guests depends largely on their size and shape (e.g., <10 and 82% convergence with planar triphenylene and bowl-shaped corannulene guests, respectively). Besides the unusual guest-induced convergence, the present cage mixture displays the strongest guest emission (ΦF = 68%) among previously reported MnLm cages and capsules, upon encapsulation of a BODIPY dye in water.

Graphical abstract: An atropisomeric M2L4 cage mixture displaying guest-induced convergence and strong guest emission in water

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Supplementary files

Article information


Submitted
10 Jun 2020
Accepted
17 Jul 2020
First published
20 Jul 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 8145-8150
Article type
Edge Article

An atropisomeric M2L4 cage mixture displaying guest-induced convergence and strong guest emission in water

T. Tsutsui, L. Catti, K. Yoza and M. Yoshizawa, Chem. Sci., 2020, 11, 8145 DOI: 10.1039/D0SC03223A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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