Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China.
Chem Commun (Camb). 2018 May 17;54(41):5164-5176. doi: 10.1039/c8cc01153b.
Negative thermal expansion (NTE), whereby lattices contract upon heating, is of considerable interest for its wide applications in many fields. Molecular materials have been widely investigated as catalysts, sensors, etc., which usually endure temperature vibration. NTE can become a substantial means for controlling the coefficients of thermal expansion. Molecular materials possess plentiful structures and can be easily decorated, making them ideal platforms for thermal expansion modification. In this feature article, we provide an overview of the recent developments in utilizing NTE in molecular materials and summarize some mechanisms leading to NTE. The discussion of NTE in molecular materials concerns many factors, including transverse vibration, geometric flexibility, host-guest interactions, spin crossover, molecular packing rearrangement and molecular conformational changes.
负热膨胀（NTE）是指晶格在加热时收缩，由于其在许多领域的广泛应用而备受关注。分子材料作为催化剂、传感器等被广泛研究，它们通常会经受温度振动。NTE 可以成为控制热膨胀系数的有效手段。分子材料具有丰富的结构并且易于修饰，使其成为热膨胀改性的理想平台。在这篇专题文章中，我们提供了利用 NTE 在分子材料中的最新发展概述，并总结了导致 NTE 的一些机制。对分子材料中 NTE 的讨论涉及许多因素，包括横向振动、几何灵活性、主客体相互作用、自旋交叉、分子堆积重排和分子构象变化。
