Low-Frequency Dipolar Dynamics and Atmospheric Effects in ZIF-90 Metal-Organic Framework

Sergejus Balčiunas, Mantas Šimenas, Diana Pavlovaite, Martynas Kinka, Fa Kuen Shieh, Kevin C.W. Wu, Juras Banys, Robertas Grigalaitis

研究成果: 雜誌貢獻期刊論文同行評審

14 引文 斯高帕斯(Scopus)

摘要

Remarkable gas adsorption properties of zeolitic imidazolate frameworks (ZIFs) are believed to be tightly related to a flexible nature of organic linkers in these compounds. We present a low-frequency dielectric spectroscopy study of dynamic effects in a ZIF-90 hybrid compound. Experiments of dehydrated framework reveal slow motion of the imidazolate-2-carboxyaldehyde linker in the kilohertz frequency range. Measurements of hydrated compound indicate two additional dynamic processes related to the adsorbed water molecules. These processes are assigned to the proton conductivity and relaxation of the supercooled water confined within the pores of the framework. We also study linker dynamics of dehydrated ZIF-90 in vacuum and under different gas atmospheres, revealing that the linker motion is significantly hindered by the guest molecules.

原文???core.languages.en_GB???
頁(從 - 到)631-636
頁數6
期刊Journal of Physical Chemistry C
123
發行號1
DOIs
出版狀態已出版 - 1 10月 2019

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