Jiang Weiming, Takeda Kazuyuki
Division of Chemistry, Graduate School of Science, Kyoto University, 606-8502 Kyoto, Japan.
Phys Chem Chem Phys. 2022 Sep 14;24(35):21210-21215. doi: 10.1039/d2cp03226k.
We study the dynamics and the exchange of carbon dioxide (CO) adsorbed in a metal organic framework (MOF) by C NMR for various sizes of the host crystal ranging from micrometers to millimeters. We found that the guest CO molecules adsorbed in [Zn(1,4-NDC)(dabco)] MOF undergo exchange at a rate that depends on the size of the host crystal, revealing that the smaller the host crystals are, the faster the exchange becomes. Such a trend can be explained by the size-dependent surface-to-volume ratio.
我们通过碳核磁共振研究了不同尺寸（从微米到毫米）的主体晶体中吸附的二氧化碳（CO₂）在金属有机框架（MOF）中的动力学和交换情况。我们发现，吸附在[Zn(1,4-NDC)(dabco)]金属有机框架中的客体CO₂分子以取决于主体晶体尺寸的速率进行交换，这表明主体晶体越小，交换速度越快。这种趋势可以用与尺寸相关的表面积与体积比来解释。
