Crystal Transformation in Zeolitic-Imidazolate Framework

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• 作者：Ze-Xian Low ; Jianfeng Yao ; Qi Liu ; Ming He ; Zhouyou Wang ; Akkihebbal K. Suresh ; Jayesh Bellare ; Huanting Wang
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：December 3, 2014
• 年：2014
• 卷：14
• 期：12
• 页码：6589-6598
• 全文大小：576K
• ISSN：1528-7505

文摘

The phase transformation of a zinc-2-methylimidazole-based zeolitic-imidazolate framework (ZIF), from a recently discovered ZIF-L to ZIF-8, was reported. ZIF-L is made up of the same building blocks as ZIF-8, having two-dimensional crystal lattices stacked layer-by-layer. Results indicated that the phase transformation occurs in the solid phase via the geometric contraction model (R2), a kinetic model new to ZIF. The phase transformation was monitored by means of ex situ powder X-ray diffraction, nitrogen sorption, Fourier transform infrared spectroscopy, selected-area electron diffraction, scanning electron microscopy, and in situ nuclear magnetic resonance spectroscopy. This work also demonstrates the first topotactic phase transformation in porous ZIFs, from a 2D layered structure to a 3D structure, and provides a new insight into metal鈥搊rganic framework crystallization mechanisms.