Giant Single-Crystal Shape Transformation with Wide Thermal Hysteresis Actuated by Synergistic Motions of Molecular Cations and Anions

Xiao Lei Wang, Jin Peng Xue, Xiao Peng Sun, Yan Xin Zhao, Shu Qi Wu, Zi Shuo Yao, Jun Tao

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

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 CuBr4 2− 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.

Original languageEnglish
Pages (from-to)6778-6783
Number of pages6
JournalChemistry - A European Journal
Volume26
Issue number30
DOIs
Publication statusPublished - May 26 2020

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry

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