Control over multiple molecular states with directional changes driven by molecular recognition

Takehiro Hirao, Dong Sub Kim, Xiaodong Chi, Vincent M. Lynch, Kazuaki Ohara, Jung Su Park (), Kentaro Yamaguchi () and Jonathan L. Sessler ()
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Takehiro Hirao: The University of Texas at Austin
Dong Sub Kim: The University of Texas at Austin
Xiaodong Chi: The University of Texas at Austin
Vincent M. Lynch: The University of Texas at Austin
Kazuaki Ohara: Tokushima Bunri University
Jung Su Park: Sookmyung Women’s University
Kentaro Yamaguchi: Tokushima Bunri University
Jonathan L. Sessler: The University of Texas at Austin

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Recently, ligand–metal coordination, stimuli-responsive covalent bonds, and mechanically interlinked molecular constructs have been used to create systems with a large number of accessible structural states. However, accessing a multiplicity of states in sequence from more than one direction and doing so without the need for external energetic inputs remain as unmet challenges, as does the use of relatively weak noncovalent interactions to stabilize the underlying forms. Here we report a system based on a bispyridine-substituted calix[4]pyrrole that allows access to six different discrete states with directional control via the combined use of metal-based self-assembly and molecular recognition. Switching can be induced by the selective addition or removal of appropriately chosen ionic guests. No light or redox changes are required. The tunable nature of the system has been established through a combination of spectroscopic techniques and single crystal X-ray diffraction analyses. The findings illustrate a new approach to creating information-rich functional materials.

Date: 2018
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DOI: 10.1038/s41467-018-03220-0

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