State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
Phys Chem Chem Phys. 2010 Mar 14;12(10):2443-9. doi: 10.1039/b920232n. Epub 2010 Jan 18.
In situ two-dimensional NMR and fluorescence emission spectroscopy were employed to investigate the cooperative structure-direction effect of organic amine such as morpholine in the synthesis of aluminophosphate molecular sieves in ionic liquids. In situ rotating frame nuclear Overhauser effect spectra (ROESY) together with fluorescence measurements demonstrate that the aggregates between imidazolium cations and morpholines through intermolecular hydrogen bonds can be formed in the gel during the crystallization of molecular sieves. Combining with the characterizations of the solid products by solid-state NMR, it is verified that different aggregates of organic amines with imidazolium cations, which is similar to self-assembled supramolecular analogues, could act as the structure-directing agents for selective tuning of the framework topologies such as AEL, AFI and LTA in the final solid products.
采用原位二维 NMR 和荧光发射光谱研究了有机胺（如吗啡啉）在离子液体中合成磷酸铝分子筛时的协同结构导向效应。原位旋转框架核 Overhauser 效应谱（ROESY）结合荧光测量表明，在分子筛结晶过程中凝胶中可以形成通过分子间氢键连接的咪唑阳离子和吗啡啉之间的聚集体。结合固态 NMR 对固体产物的表征，验证了不同的有机胺与咪唑阳离子的聚集体可以作为结构导向剂，用于选择性调变最终固体产物的骨架拓扑结构，如 AEL、AFI 和 LTA。
