Berzelii Center EXSELENT on Porous Materials, Department of Materials and Environmental Chemistry , Stockholm University , Stockholm SE-106 91 , Sweden.
National Engineering Laboratory for Methanol to Olefins, Dalian National Laboratory for Clean Energy , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , China.
Inorg Chem. 2018 Sep 17;57(18):11753-11760. doi: 10.1021/acs.inorgchem.8b01890. Epub 2018 Aug 29.
Two-dimensional zeolitic materials have drawn increasing attention because of their structural diversity, high accessible surface areas, and potential as precursors to form novel three-dimensional (3D) structures. Here we report a new layered fluoroaluminophosphate, denoted as EMM-9 (ExxonMobil Material #9), synthesized in the same synthesis system as that for a previously reported 3D framework structure EMM-8 (framework-type code: SFO) using an F medium and 4-(dimethylamino)pyridine (DMAP) as the organic structure-directing agent. The structure of EMM-9 was solved from rotation electron diffraction data and refined against synchrotron powder X-ray diffraction data. The fluoroaluminophosphate layer of EMM-9 is composed of sti composite building units. The DMAP cations are located between the layers. π-π interactions between the DMAP cations and hydrogen bonding between the DMAP cations and layers were identified. The layered EMM-9 structure is closely related to the 3D framework structure of EMM-8 and can be transformed to EMM-8 by calcination.
二维沸石材料由于其结构多样性、高可及表面积以及作为形成新型三维（3D）结构前体的潜力而引起了越来越多的关注。在这里，我们报告了一种新的层状氟铝磷酸盐，称为 EMM-9（埃克森美孚材料 #9），它是在与先前报道的 3D 骨架结构 EMM-8（骨架型代码：SFO）相同的合成体系中合成的，使用 F 介质和 4-（二甲氨基）吡啶（DMAP）作为有机结构导向剂。通过旋转电子衍射数据确定了 EMM-9 的结构，并通过同步辐射粉末 X 射线衍射数据进行了精修。EMM-9 的氟铝磷酸盐层由 sti 复合结构单元组成。DMAP 阳离子位于层之间。鉴定了 DMAP 阳离子之间的π-π 相互作用和 DMAP 阳离子与层之间的氢键。层状 EMM-9 结构与 EMM-8 的 3D 骨架结构密切相关，并且可以通过煅烧转化为 EMM-8。
