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辽宁大学化学院张渝阳课题组报道了一种同时具有酸碱双功能的核壳ZIF-90@ZIF-67材料,首次应用于Pickering乳液来催化Deacetalization-Knoevenagel 串联反应,表现出优异的催化性能,并获得了超高的产率。此外,ZIF-90@ZIF-67具有较高的稳定性,并且循环五次后仍保持良好的重复性。这项工作为设计结构和功能多样化的基于MOFs的Pickering乳液界面催化提供了平台。
金属-有机框架(Metal-Organic Frameworks)是由金属中心和有机连接体通过配位键构建成的极具发展前景的晶体微孔材料。作为MOFs的一个亚族,沸石型咪唑盐框架(ZIFs)由于其独特的类沸石结构而具有较好的化学稳定性,考虑到沸石和MOF材料的综合性能,越来越多的ZIFs及其衍生材料被报道作为稳定Pickering乳液的理想乳化剂。 单独的ZIF-90和ZIF-67有丰富的Lewis酸性位点和碱性位点,但是他们在催化串联反应时的产率不能让人满意。不可思议的是,将ZIF-90和ZIF-67进行复合,能够有效解决单独的ZIF-90和ZIF-67在串联反应中的缺陷,产生协同催化的效果,同时这种核壳结构的复合材料还扮演着Pickering乳液油水界面的稳定剂。与非乳液体系相比,本实验中由水和甲苯构成的Pickering乳液体系,能够使界面面积最大化,能够提高两种极性差异很大的底物之间反应的催化效率。此外,串联反应避免了中间体的分离和纯化,减少有机试剂的使用,是一种符合绿色合成的催化策略。所有表征方法都证明ZIF-90@ZIF-67在经过5个循环后仍然保持较高的稳定性和催化性能。 论文信息 An Efficient Bifunctional Core-Shell ZIF-90@ZIF-67 Composite as a Stable Pickering Interfacial Catalyst for the Deacetalization–Knoevenagel Tandem Reaction Wei Liu, Yu-Qing Zhang, Zhen-Lin Dong, Zi-Xuan Chen, Lei Li, Xin-Yuan Zhao, Yang Wu, Yu-Yang Zhang Chemistry – A European Journal DOI: 10.1002/chem.202403363

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