Affiliation:
1. Key Laboratory of Cluster Science of Ministry of Education School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
2. School of Optoelectronics Beijing Institute of Technology Key Laboratory of Biomimetic Robots and Systems Ministry of Education Beijing 100081 P. R. China
Abstract
AbstractThe molecular crystals that manifest unusual mechanical properties have attracted growing attention. Herein, we prepared an organic single crystal that shows bidirectional superelastic transformation in response to shear stress. Single‐crystal X‐ray diffractions revealed this crystal‐twinning related shape change is owed to a stress‐controlled 90° rotation of 4,4′‐bipyridine around the hydrogen bonds of a chiral organic trimer. As a consequence of the 90° shift in the aromatic plane, an interconversion of crystallographic a‐, b‐axes (a→b′ and b→a′) was detected. The molecular rotations changed the anisotropic absorption of linearly polarized light. Therefore, a stress‐induced inversion of linear dichroism spectra was demonstrated for the first time. This study reveals the superior mechanical flexibilities of single crystals can be realized by harnessing the molecular rotations and this superelastic crystal may find applications in optical switching and communications.
Funder
National Natural Science Foundation of China
Subject
General Chemistry,Catalysis
Cited by
4 articles.
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