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Template‐Mediated Control over Polymorphism in the Vapor‐Assisted Formation of Zeolitic Imidazolate Framework Powders and Films
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-12-22 , DOI: 10.1002/anie.202014791
Min Tu 1 , Dmitry E. Kravchenko 2 , Benzheng Xia 2 , Víctor Rubio-Giménez 2 , Nathalie Wauteraerts 2 , Rhea Verbeke 2 , Ivo Vankelecom 2 , Timothée Stassin 2 , Werner Egger 3 , Marcel Dickmann 4 , Heinz Amenitsch 5 , Rob Ameloot 6
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-12-22 , DOI: 10.1002/anie.202014791
Min Tu 1 , Dmitry E. Kravchenko 2 , Benzheng Xia 2 , Víctor Rubio-Giménez 2 , Nathalie Wauteraerts 2 , Rhea Verbeke 2 , Ivo Vankelecom 2 , Timothée Stassin 2 , Werner Egger 3 , Marcel Dickmann 4 , Heinz Amenitsch 5 , Rob Ameloot 6
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The landscape of possible polymorphs for some metal–organic frameworks (MOFs) can pose a challenge for controlling the outcome of their syntheses. Demonstrated here is the use of a template to control in the vapor‐assisted formation of zeolitic imidazolate framework (ZIF) powders and thin films. Introducing a small amount of either ethanol or dimethylformamide vapor during the reaction between ZnO and 4,5‐dichloroimidazole vapor results in the formation of the porous ZIF‐71 phase, whereas other conditions lead to the formation of the dense ZIF‐72 phase or amorphous materials. Time‐resolved in situ small‐angle X‐ray scattering reveals that the porous phase is metastable and can be transformed into its dense polymorph. This transformation is avoided through the introduction of template vapor. The porosity of the resulting ZIF powders and films was studied by N2 and Kr physisorption, as well as positron annihilation lifetime spectroscopy. The templating principle was demonstrated for other members of the ZIF family as well, including the ZIF‐7 series, ZIF‐8_Cl, and ZIF‐8_Br.
中文翻译：
模板介导的沸石咪唑酸酯骨架粉末和薄膜的蒸汽辅助形成中的多态性控制
一些金属有机框架（MOF）可能存在的多晶型物的状况可能对控制其合成结果构成挑战。这里展示的是使用模板来控制沸石咪唑酸酯骨架（ZIF）粉末和薄膜的蒸汽辅助形成。在ZnO与4,5-二氯咪唑蒸气之间的反应过程中引入少量乙醇或二甲基甲酰胺蒸气会导致形成多孔ZIF-71相，而其他条件则会导致形成致密的ZIF-72相或非晶质材料。时间分辨的原位小角度X射线散射表明，多孔相是亚稳态的，可以转变为其致密的多晶型物。通过引入模板蒸气可以避免这种转变。2，Kr的物理吸附以及正电子an没寿命谱。ZIF系列的其他成员也演示了模板原理，包括ZIF-7系列，ZIF-8_Cl和ZIF-8_Br。
更新日期：2020-12-22
中文翻译：
模板介导的沸石咪唑酸酯骨架粉末和薄膜的蒸汽辅助形成中的多态性控制
一些金属有机框架（MOF）可能存在的多晶型物的状况可能对控制其合成结果构成挑战。这里展示的是使用模板来控制沸石咪唑酸酯骨架（ZIF）粉末和薄膜的蒸汽辅助形成。在ZnO与4,5-二氯咪唑蒸气之间的反应过程中引入少量乙醇或二甲基甲酰胺蒸气会导致形成多孔ZIF-71相，而其他条件则会导致形成致密的ZIF-72相或非晶质材料。时间分辨的原位小角度X射线散射表明，多孔相是亚稳态的，可以转变为其致密的多晶型物。通过引入模板蒸气可以避免这种转变。2，Kr的物理吸附以及正电子an没寿命谱。ZIF系列的其他成员也演示了模板原理，包括ZIF-7系列，ZIF-8_Cl和ZIF-8_Br。
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