School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P. R. China.
School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Pudong, Shanghai, 201210, P. R. China.
Chemistry. 2018 Jun 18;24(34):8615-8623. doi: 10.1002/chem.201800307. Epub 2018 May 22.
Mesoporous MFI zeolites (MMZs) have been constructed by using the surfactant-containing azobenzene segment in the hydrophobic tail. The cylindrical π-π stacking of azeobenzene groups is considered to be the key factor to form the ordered mesostructure through cooperative structural matching and the rearrangement of MFI frameworks. The mesostructure has been tuned from a disordered hierarchical arrangement into an ordered 2D square p4mm structure by changing the length of the alkyl chain between the diquaternary ammonium head group and azobenzene group. The geometric matching between the MFI zeolitic framework and the alkyl chain length plays an important role in the construction of the crystallographically correlated mesostructure with 2D square ordering. A combination of X-ray diffraction patterns and electron microscopy studies provides visible evidence for the mesostructural transformation from a short-range hexagonal or lamellar ordering to 2D square mesostructure.
介孔 MFI 沸石（MMZ）是通过在疏水尾链中使用含有表面活性剂的偶氮苯段构建的。偶氮苯基团的圆柱状 π-π 堆积被认为是通过协同结构匹配和 MFI 骨架的重排形成有序介孔结构的关键因素。通过改变二季铵头基和偶氮苯基团之间的烷基链长度，将介孔结构从无序的分级排列调谐为有序的 2D 四方 p4mm 结构。MFI 沸石骨架与烷基链长度之间的几何匹配在构建具有 2D 四方有序的晶相相关介孔结构中起着重要作用。X 射线衍射图谱和电子显微镜研究的结合为介孔结构从短程六方或层状有序到 2D 四方介孔结构的转变提供了明显的证据。
