Capsule-Capsule Conversion by Guest Encapsulation

Shitao Wang; Tomohisa Sawada; Kazuaki Ohara; Kentaro Yamaguchi; Makoto Fujita

doi:10.1002/anie.201509278

Capsule-Capsule Conversion by Guest Encapsulation

Angew Chem Int Ed Engl. 2016 Feb 5;55(6):2063-6. doi: 10.1002/anie.201509278. Epub 2016 Jan 6.

Authors

Shitao Wang¹, Tomohisa Sawada¹, Kazuaki Ohara², Kentaro Yamaguchi², Makoto Fujita³

Affiliations

¹ Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
² Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1, Shido, Sanuki, Kagawa, 769-2193, Japan.
³ Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan. mfujita@appchem.t.u-tokyo.ac.jp.

PMID: 26836338
DOI: 10.1002/anie.201509278

Abstract

Guest-induced M18 L6 -M24 L8 capsule-capsule conversion is reported. Both capsules are composed of Pd(II) ethylenediamine units (M) and 1,3,5-tris(3,5-pyrimidyl)pyrimidine (L), and form trigonal bipyramidal (M18 L6 ) and octahedral (M24 L8) closed-shell structures with huge hydrophobic inner spaces. The M18 L6 trigonal bipyramid is converted to the M24 L8 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.

Keywords: coordination chemistry; host-guest systems; molecular capsules; self-assembly; supramolecular chemistry.

Publication types

Research Support, Non-U.S. Gov't