Issue 21, 2024

Hydrogen-bond-modulated negative linear compressibility in a V-shaped molecular crystal

Abstract

A material with the “hidden” negative linear compressibility (NLC) will expand along a specific crystal direction upon uniformly compression to a critical pressure; such materials are thought to be promising candidates for non-linear actuators, switches and sensors. Herein, we use density functional theory (DFT) calculations to uncover the hidden NLC in a V-shaped molecular crystal, bis(5-amino-1,2,4-triazol-3-yl)methane (BATZM). The calculations indicate that the crystal is normally compressed over the pressure range of 0–3 GPa while it expands along the b-axis when the external hydrostatic pressure exceeds 3 GPa. The compressive behavior of the BATZM crystal is modulated by inter-molecular hydrogen bonds, which act as highly compressible springs at low pressures but robust struts at high pressures. Hence, the crystal prefers to compress the hydrogen bonds coupled with PLC at first and flatten the molecules, coupled with later NLC to resist the increasing external pressure. The compressive behavior of BATZM provides a strategy to design more hidden NLC materials via the rational use of the hydrogen bonds.

Graphical abstract: Hydrogen-bond-modulated negative linear compressibility in a V-shaped molecular crystal

Supplementary files

Article information

Article type
Paper
Submitted
13 mar. 2024
Accepted
07 may. 2024
First published
08 may. 2024

Phys. Chem. Chem. Phys., 2024,26, 15286-15291

Hydrogen-bond-modulated negative linear compressibility in a V-shaped molecular crystal

Q. Zeng, W. Qiu, C. Li, Y. Sun, J. Hao and Y. Li, Phys. Chem. Chem. Phys., 2024, 26, 15286 DOI: 10.1039/D4CP01102C

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