Li Xu, Li Zhenhu, Lu Li, Huang Limin, Xiang Lu, Shen Jun, Liu Shuangyi, Xiao Dong-Rong
College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, P. R. China.
Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, P. R. China.
Chemistry. 2017 Aug 4;23(44):10638-10643. doi: 10.1002/chem.201701721. Epub 2017 Jul 13.
Studying inter-dimensional phase transitions of zeolitic-imidazolate frameworks (ZIFs) is essential for developing strategies in controlling morphology and properties. Herein, the inter-dimensional topotactic phase transformations of 3D ZIF-67 to 2D ZIF-L are investigated in detail by employing a simple and efficient solvent-induced growth method. In addition to ZIF-67 and ZIF-L, a series of novel core-shell composites of ZIF-67@ZIF-L, with unprecedented morphologies, are also obtained and well-defined. The different behaviors of the amine hydrogen of 2-MIM in the solvents play a pivotal role for inter-dimensional phase transformations, and in combination with the concentration of 2-MIM, the 2D to 3D phase transformations are also revealed. The findings are very beneficial for morphological design of the ZIFs, along with exploration of the corresponding properties. Impressively, Co-ZIFs exhibit interesting tunable CO adsorption behaviors with the phase evolution, which might bring broader understanding for designing CO detection and adsorption devices.
研究沸石咪唑酯骨架材料（ZIFs）的跨维度相变对于制定控制其形态和性质的策略至关重要。在此，通过采用一种简单高效的溶剂诱导生长方法，详细研究了三维ZIF-67到二维ZIF-L的跨维度拓扑相变。除了ZIF-67和ZIF-L之外，还获得了一系列具有前所未有的形态且结构明确的新型ZIF-67@ZIF-L核壳复合材料。溶剂中2-甲基咪唑（2-MIM）的胺氢的不同行为对跨维度相变起着关键作用，并且结合2-MIM的浓度，还揭示了二维到三维的相变。这些发现对于ZIFs的形态设计以及相应性质的探索非常有益。令人印象深刻的是，钴基ZIFs随着相演变表现出有趣的可调CO吸附行为，这可能为设计CO检测和吸附装置带来更广泛的理解。
