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Enantiopure [Cs+/Xe⊂Cryptophane]⊂FeII4L4 Hierarchical Superstructures.

Accepted version
Peer-reviewed

Type

Article

Change log

Abstract

Hierarchically nested hosts offer new opportunities to control the guest binding of the inner host, functionalize the cavity of the outer host, and investigate communication between different layers. Here we report a self-assembled triazatruxene-based FeII4L4 capsule, which was able to encapsulate a covalent cage, cryptophane-111 (CRY). The resulting cage-in-cage complex was capable of accommodating a cesium cation or xenon atom with altered guest binding behavior compared to the CRY alone. A crystal structure of the Russian doll complex [Cs+⊂CRY]⊂FeII4L4 unambiguously demonstrated the unusual encapsulation of a cation within a capsule bearing a 8+ charge. Moreover, the binding of enantiopure CRY occurred with high enantioselectivity (530-fold) between the two enantiomers of the tetrahedron. This discrimination resulted in stereochemical information transfer from the inner covalent cage to the outer self-assembled capsule, leading to the formation of enantiopure [guest⊂cage]⊂cage complexes. The stereochemistry of the tetrahedron persisted even after displacement of CRY with an achiral guest.

Description

Keywords

3402 Inorganic Chemistry, 3403 Macromolecular and Materials Chemistry, 3405 Organic Chemistry, 34 Chemical Sciences

Journal Title

J Am Chem Soc

Conference Name

Journal ISSN

0002-7863
1520-5126

Volume Title

141

Publisher

American Chemical Society (ACS)

Rights

All rights reserved
Sponsorship
European Research Council (695009)
Engineering and Physical Sciences Research Council (EP/P027067/1)
European Research Council (695009), the UK Engineering and Physical Sciences Research Council (EPSRC, EP/P027067/1)