Pressure‐induced insertion and transformation of N2 in the cavities of zeolitic imidazolate framework‐8: A Raman study,Journal of Raman Spectroscopy

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Pressure‐induced insertion and transformation of N2 in the cavities of zeolitic imidazolate framework‐8: A Raman study
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-04-23 , DOI: 10.1002/jrs.5888
Shuanglong Chen ₁ , Xin Li ₂ , Hang Lv ₁ , Enlai Dong ₁ , Xibao Yang ₃ , Ran Liu ₂ , Bingbing Liu ₂

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We have investigated the pressure‐induced behaviors of nitrogen confined in the zero‐dimensional cavities of zeolitic imidazolate framework (ZIF)‐8 using Raman spectroscopy. Pressure forces the nitrogen molecules in the pressure‐transmitting medium (PTM) to enter the inner pores of ZIF‐8, and two Raman bands attributed to the nitrogen molecules interacting with the framework of ZIF‐8 and those approximately in the central part of the cavities surrounded by the former are observed. The confined nitrogen species transform in a different way under high pressure from those of the bulk nitrogen and the confined nitrogen in the one‐dimensional inorganic channels. Both the intermolecular interaction and the host–guest interaction jointly contribute to the transformation and a highly disordered and densely compressed state of the confined nitrogen is formed at 20 GPa. A hysteresis is found when comparing the Raman spectra at low and industrially accessible pressures after a compression and decompression cycle, suggesting that the ability of ZIF‐8 to storage nitrogen molecules increases. This study opens a new path toward understanding new behaviors of nitrogen in the nanostate and applications of ZIF‐8 for gas storage and capture.

中文翻译：

压力诱导的N2在沸石咪唑酸盐骨架8中的插入和转化：拉曼研究

我们使用拉曼光谱研究了氮在沸石咪唑酸酯骨架（ZIF）-8的零维腔中的压力诱导行为。压力迫使压力传递介质（PTM）中的氮分子进入ZIF-8的内孔，归因于氮分子与ZIF-8的骨架相互作用的两个拉曼谱带以及大约在ZIF-8中心的那些相互作用。观察到被前者包围的空腔。在高压下，承压态氮与一维无机通道中的本体氮和承压态氮的转化方式不同。分子间的相互作用和主体-客体的相互作用共同促进了转化，并且在20 GPa时形成了高度无序且紧密压缩的受限氮态。在压缩和减压循环后，在低压力和工业可及压力下比较拉曼光谱时，发现存在磁滞现象，这表明ZIF-8储存氮分子的能力增强。这项研究为了解氮在纳米态中的新行为以及ZIF-8在气体存储和捕获中的应用开辟了一条新途径。

更新日期：2020-04-23

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