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Issue 23, 2015
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Order–disorder phase transition coupled with torsion in tri-n-butylammonium trichloroacetate (TBAT)

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Abstract

A novel molecular phase transition compound, tri-n-butylammonium trichloroacetate (TBAT), has been successfully synthesized with a reversible phase transition at 196 K. Its phase transition behaviour was confirmed by specific heat capacity and differential scanning calorimetry (DSC) measurements with a 2 K thermal hysteresis, indicating that the phase transition is a first-order one. Dielectric measurements further reveal the reversible nature of the phase transition, which exhibits distinctive step-like anomalies between low and high dielectric states. Moreover, temperature dependent single-crystal X-ray diffraction analyses of TBAT disclose that the order–disorder transformation of the flexible tri-n-butylammonium cations and the haloacetic acids anion together with the torsion in the cations stimulate the structural phase transition. All these results open a new way to design and assemble novel phase transition materials.

Graphical abstract: Order–disorder phase transition coupled with torsion in tri-n-butylammonium trichloroacetate (TBAT)

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Supplementary files

Article information


Submitted
08 Apr 2015
Accepted
05 May 2015
First published
05 May 2015

J. Mater. Chem. C, 2015,3, 6053-6057
Article type
Paper
Author version available

Order–disorder phase transition coupled with torsion in tri-n-butylammonium trichloroacetate (TBAT)

M. A. Asghar, C. Ji, Y. Zhou, Z. Sun, T. Khan, S. Zhang, S. Zhao and J. Luo, J. Mater. Chem. C, 2015, 3, 6053
DOI: 10.1039/C5TC00989H

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