Capsule-Capsule Conversion by Guest Encapsulation

Guest‐induced M18L6–M24L8 capsule–capsule conversion is reported. Both capsules are composed of PdII ethylenediamine units (M) and 1,3,5‐tris(3,5‐pyrimidyl)pyrimidine (L), and form trigonal bipyramidal (M18L6) and octahedral (M24L8) closed‐shell structures with huge hydrophobic inner spaces. The M18...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2016-02, Vol.55 (6), p.2063-2066
Main Authors: Wang, Shitao, Sawada, Tomohisa, Ohara, Kazuaki, Yamaguchi, Kentaro, Fujita, Makoto
Format: Article
Language:English
Subjects:
Conversion
coordination chemistry
Encapsulation
Environment
Ethylenediamine
Holes
host-guest systems
Hydrophobicity
molecular capsules
self-assembly
supramolecular chemistry
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Summary:Guest‐induced M18L6–M24L8 capsule–capsule conversion is reported. Both capsules are composed of PdII ethylenediamine units (M) and 1,3,5‐tris(3,5‐pyrimidyl)pyrimidine (L), and form trigonal bipyramidal (M18L6) and octahedral (M24L8) closed‐shell structures with huge hydrophobic inner spaces. The M18L6 trigonal bipyramid is converted to the M24L8 octahedron through encapsulation of large aromatic guests, with the latter capsule possessing a cavity volume three times larger than the former. Despite the dynamic properties of the capsule host, the encapsulated guests are difficult to extract and are thus isolated from the external environment. Guests welcome: A self‐assembled M18L6 trigonal bipyramidal capsule based on PdII units (M) and panel ligands (L) reorganizes into a larger M24L8 octahedral capsule, concomitant with considerable cavity expansion (381 to 943 Å3) and encapsulation of large guest(s). Although the metal–ligand interaction is labile, the capsule formed shows considerable kinetic stability.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201509278