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- Title
Wide-Ranging Host Capability of a Pd<sup>II</sup>-Linked M<sub>2</sub>L<sub>4</sub> Molecular Capsule with an Anthracene Shell.
- Authors
Kishi, Norifumi; Li, Zhiou; Sei, Yoshihisa; Akita, Munetaka; Yoza, Kenji; Siegel, Jay S.; Yoshizawa, Michito
- Abstract
This article reports that an M2L4 molecular capsule is capable of encapsulating various neutral molecules in quantitative yields. The capsule was obtained as a single product by mixing a small number of components; two PdII ions and four bent bispyridine ligands containing two anthracene panels. Detailed studies of the host capability of the PdII-linked capsule revealed that spherical (e.g., paracyclophane, adamantanes, and fullerene C60), planar (e.g., pyrenes and triphenylene), and bowl-shaped molecules (e.g., corannulene) were encapsulated in the large spherical cavity, giving rise to 1:1 and 1:2 host-guest complexes, respectively. The volume of the encapsulated guest molecules ranged from 190 to 490 Å3. Within the capsule, the planar guests adopt a stacked-dimer structure and the bowl-shaped guests formed an unprecedented concave-to-concave capsular structure, which are fully shielded by the anthracene shell. Competitive binding experiments of the capsule with a set of the planar guests established a preferential binding series for pyrenes≈phenanthrene>triphenylene. Furthermore, the capsule showed the selective formation of an unusual ternary complex in the case of triphenylene and corannulene.
- Publication
Chemistry - A European Journal, 2013, Vol 19, Issue 20, p6313
- ISSN
0947-6539
- Publication type
Academic Journal
- DOI
10.1002/chem.201204010