Crystal Transformation in Zeolitic-Imidazolate Framework
2014; American Chemical Society; Volume: 14; Issue: 12 Linguagem: Inglês
10.1021/cg501502r
ISSN1528-7505
AutoresZe‐Xian Low, Jianfeng Yao, Qi Liu, Ming He, Zhouyou Wang, Akkihebbal K. Suresh, Jayesh Bellare, Huanting Wang,
Tópico(s)Nanoplatforms for cancer theranostics
ResumoThe 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–organic framework crystallization mechanisms.
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