期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 4, 页码 2016-2024出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c12064
关键词
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资金
- National Natural Science Foundation of China [21825107, 21801241]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
Controlled self-assembly of three topologically unprecedented conjoined twin-cages was achieved in this study, with structural conversions between cages 3 and 4 enabled by changing solvents. This interconversion between topologically complex superstructures may lay a solid foundation for achieving a variety of functions within a switchable system.
Stimuli-responsive structural transformations between discrete coordination supramolecular architectures not only are essential to construct smart functional materials but also provide a versatile molecular-level platform to mimic the biological transformation process. We report here the controlled self-assembly of three topologically unprecedented conjoined twin-cages, i.e., one stapled interlocked Pd12L6 cage (2) and two helically isomeric Pd6L3 cages (3 and 4) made from the same cis-blocked palladium corners and a new bis-bidentate ligand (1). While cage 2 features three mechanically coupled cavities, cages 3 and 4 are topologically isomeric helicate-based twin-cages based on the same metal/ligand stoichiometry. Sole formation of cage 2 or a dynamic mixture of cages 3 and 4 can be controlled by changing the solvents employed during the self-assembly. Structural conversions between cages 3 and 4 can be triggered by changes in both temperature/solvent and induced-fit guest encapsulations. Well-controlled interconversion between such topologically complex superstructures may lay a solid foundation for achieving a variety of functions within a switchable system.
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