金属有机框架结构材料的反常热膨胀性-中国材料进展

文章信息/Info

Author(s):: Liu Zhanning; Chen Jun; Deng Jinxia; Xing Xianran; Department of Physical Chemistry, University of Science and Technology Beijing

关键词:: 负热膨胀性能' target="_blank" rel="external"> FONT-FAMILY: 宋体">负热膨胀性能; 金属有机骨架结构; 横向振动

摘要:: 框架结构材料因其特有的原子排列方式往往呈现出特殊的性质，其中一些物质表现出负热膨胀性能（NTE），如ZrW2O8，ZrMo2O8等、沸石和普鲁士蓝结构由于其特有的骨架构型，表现出负热膨胀性，即体积随温度的升高而收缩。近年来，以配位化学为基础发展起来的金属有机骨架结构的材料正迅猛发展，新的结构不断被发现。其中不乏一些物质表现出反常的热膨胀性，如IRMOFs、HKUST-1、MIL-53等均表现出负热膨胀性，而一些物质具有反常的巨大的负热膨胀系数，如Ag3Co(CN)6。金属有机框结构的负热膨胀性往往起源于骨架中桥连原子垂直于连接方向的横向振动，而金属有机骨架的热膨胀性能往往还涉及到配体的柔性带来的影响以及变温过程中配体的转动等行为。本文就金属有机骨架结构的反常热膨胀性近年取得的一些研究进展和展望作了简要综述，以期更多的学者对这一领域产生兴趣。

Abstract:: Some framework materials show unique properties due to their special atomic arrangement，among them some show abnormal thermal expansion，for example ZrW2O8，ZrMo2O8，et al，zeolite and Prussian blue analogues show negative thermal expansion(volume contract with increasing temperature).Recently, researches about metal-organic frameworks based on coordination chemistry developed rapidly，numerous structure have been found. Some metal-organic frameworks show abnormal thermal expansion, for example, IRMOFs、HKUST-1、MIL-53 show negative thermal expansion, while some MOFs show colossal thermal expansion, such as Ag3Co(CN)6. Most framework materials show negative thermal expansion due to the transverse vibration of the bridging atoms, while, as for MOFs, the flexibility and the rotation of ligands also contribute to thermal expansion properties. This paper is mainly concerning abnormal thermal expansion properties of MOFs to inspire more researchers’ interest.