Molecularly Engineered Layered Compounds: Their Synthesis, Structure and Chemistry

该项目属于无机、生物无机和有机金属化学专业，研究具有层状结构的含空腔的金属磷化合物，可用于催化或化学分离。这些化合物在结构上与沸石相关，沸石广泛用于水净化和作为工业催化剂或催化剂载体。将合成和表征多种具有层状结构的金属有机磷酸盐和磷酸盐。选择2+ ~ 4+价的金属，也可制备混合价的化合物。将制备其悬垂有机基团含有氨基、羧基或磺酸基，或以聚醚或多胺链作为悬垂基团的功能化衍生物。聚醚或多胺链的桥接有望产生隐链状结构，而联苯的桥接有望产生热稳定的结构。有机膦酸盐将被热分解以试图产生新的无机层状磷酸盐，并将被控制水解以制备新的层状氢氧化物和氧化物。研究了新材料在催化、离子交换和吸附等方面的应用。例如，Lewis酸与Bronsted酸位点在酸催化反应中的作用将被评估。

This project in the Inorganic, Bioinorganic and Organometallic Chemistry Program is concerned with metal phosphorus compounds with layered structures containing cavities which may be exploited for catalysis or in chemical separations. These compounds are related structurally to the zeolites which are used extensively in water purification and as industrial catalysts or catalyst supports. A variety of metal organophosphates and phosphonates with layered structures will be synthesized and characterized. Metals will be chosen with valences ranging from 2+ to 4+, and mixed valence compounds will be prepared also. Functionalized derivatives in which the pendant organic groups contain amino, carboxlylic or sulfonic acid groups, or with polyether or polyamine chains as pendant groups, will be prepared. Bridging by polyether or polyamine chains is expected to yield cryptand-like structures, whereas bridging by biphenyls is expected to yield thermally stable structures. The organophosphonates will be decomposed thermally in an attempt to produce novel inorganic layered phosphates, and will be subjected to controlled hydrolysis to prepare new layered hydroxides and oxides. Applications of the new materials in catalysis, ion exchange and specific sorption will be examined. For example, the role of Lewis acid versus Bronsted acid sites in acid catalyzed reactions will be assessed.