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- Title
Giant Single‐Crystal Shape Transformation with Wide Thermal Hysteresis Actuated by Synergistic Motions of Molecular Cations and Anions.
- Authors
Wang, Xiao‐Lei; Xue, Jin‐Peng; Sun, Xiao‐Peng; Zhao, Yan‐Xin; Wu, Shu‐Qi; Yao, Zi‐Shuo; Tao, Jun
- Abstract
Manipulating the collective molecular movements to implement macroscopic mechanical response of bulk material is attractive and challenging. Here, an organic‐inorganic hybrid single crystal is synthesized, which exhibits a giant macroscopic shape transformation with a remarkable thermal hysteretic feature. The colossal anisotropic shape change, which manifests as an abrupt elongation of ca. 9 % along the crystallographic c‐axis and a concomitant contraction of ca. 9 % in a perpendicular direction, is induced by a significant reorientation of imidazolium, accompanied with a substantial configurational variation in CuBr42− complex anions. The synergistic motions of both the molecular cations and anions engender a remarkable large thermal hysteresis (>30 K) in the shape transformation of the single crystal, implying that this material may play a role in alternating memory media. Furthermore, due to the stable crystal lattice, a single crystal that demonstrates naked‐eye detectable large shape transformation was used as a thermal actuator to spontaneously control an electric circuit by temperature variation.
- Subjects
BULK solids; SINGLE crystals; CRYSTAL lattices; ELECTRIC circuits; CATIONS; HYSTERESIS
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 30, p6778
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202000845