日本京都大学Susumu Kitagawa团队近日宣布，他们开发了一种对乙炔可调吸附的柔性链状金属有机框架。相关论文于2022年4月21日发表于国际顶尖学术期刊《自然—化学》。

易燃气体（如乙炔）的安全储存对于当前的工业应用是必不可少的。然而，纯乙炔的工业使用所要求的压力(P)和温度范围（100<P<200 kPa，298K）及其在较高压力下的爆炸特性使其储存和释放具有挑战性。表现出门控吸附/解吸行为——即客体的吸收和释放发生在阈值压力以上同时伴有框架变形——的柔性金属有机框架已显示出作为存储吸附剂的前景。

在该研究中，课题组通过对一系列锌基混合配体链状金属有机框架的配体进行两种不同官能团的修饰，并改变其比例，来控制其气体的吸收和释放压力。这影响了框架的变形能，进而控制了门控行为。该材料具有良好的乙炔存储性能，在298K和实用压力范围内（100-150 kpa）可用容量为~90 v/v（总体积的77%）。

附：英文原文

Title: Tunable acetylene sorption by flexible catenated metal–organic frameworks

Author: Bonneau, Mickaele, Lavenn, Christophe, Zheng, Jia-Jia, Legrand, Alexandre, Ogawa, Tomofumi, Sugimoto, Kunihisa, Coudert, Francois-Xavier, Reau, Regis, Sakaki, Shigeyoshi, Otake, Ken-ichi, Kitagawa, Susumu

Issue&Volume: 2022-04-21

Abstract: The safe storage of flammable gases, such as acetylene, is essential for current industrial purposes. However, the narrow pressure (P) and temperature range required for the industrial use of pure acetylene (100<P<200kPa at 298K) and its explosive behaviour at higher pressures make its storage and release challenging. Flexible metal–organic frameworks that exhibit a gated adsorption/desorption behaviour—in which guest uptake and release occur above threshold pressures, usually accompanied by framework deformations—have shown promise as storage adsorbents. Herein, the pressures for gas uptake and release of a series of zinc-based mixed-ligand catenated metal–organic frameworks were controlled by decorating its ligands with two different functional groups and changing their ratio. This affects the deformation energy of the framework, which in turn controls the gated behaviour. The materials offer good performances for acetylene storage with a usable capacity of ~90v/v (77% of the overall amount) at 298K and under a practical pressure range (100–150kPa).

DOI: 10.1038/s41557-022-00928-x

Source: https://www.nature.com/articles/s41557-022-00928-x