U.S.-China Cooperative Research: Preparation and Propertiesof Layered Organic Derivatives of Group IV Metals

由美国德州农工大学的Abraham Clearfield博士和中国科学院青海盐湖研究所的彭光志教授共同提出的“IV族金属层状有机衍生物的制备和性质”的论文是由美国国家科学基金会和中国科学院共同资助的。研究人员建议将青海研究所的合成能力与德克萨斯A&amp；M现有的表征技术（固态核磁共振、质谱、热分析、表面分析、电子显微镜和衍射方法）结合起来，研究层状IV族磷酸盐有机衍生物的合成和行为。特别是新型膦酸和有机磷酸盐的合成及其与IV阳离子的后续反应。这些反应导致层状金属磷酸盐和磷酸盐的形成，其中有机部分位于层间空间。当使用二膦酸时，有机基团在各层之间架起桥梁，并作为支柱将各层固定在适当的位置。研究人员将尝试制备混合衍生物，以使柱间距和产生相对均匀大小的孔，并用羧酸盐、磺酸盐和氨基对有机基团进行官能团化，使衍生物具有离子交换和络合能力。催化活性物质也将固定在层状化合物上。这项研究应适用于光化学、分离程序、催化、离子交换和离子筛分。所述化合物也可作为合成新型层间磷酸盐和氧化物的前体。

This proposal on "Preparation and Properties of Layered Organic Derivatives of Group IV Metals" between Dr. Abraham Clearfield of Texas A&M University and Professor Guang-Zhi Peng of the Qinghai Institute of Salt Lake of the Chinese Academy of Sciences (CAS) is jointly sponsored by NSF and CAS. The researchers propose to combine synthetic capabilities of the Qinghai Institute with characterization techniques available at Texas A&M (solid state NMR, mass spectrometry, thermal analysis, surface analysis, electron microscopy and diffraction methods) to investigate the synthesis and behavior of organic derivatives of layered group IV phosphates, especially and their synthesis of novel phosphonic acids and organic phosphates and their subsequent reaction with IV cations. These reactions lead to the formation of layered metal phosphonates and phosphates in which the organic moiety resides in the interlamellar space. When diphosphonic acids are used, the organic group bridges across layers and acts as pillars holding the layers in place. The researchers will attempt to prepare mixed derivatives so as to space the pillars and produce pores of relatively uniform size, and to functionalize the organic groups with carboxylate, sulphonate and amino groups to impart ion exchange and complexing power to the derivatives. Catalyically active species will also be immobilized on the layered compounds. This research should be applicable to photochemistry, separations procedures, catalysis, ion exchange and ion sieving. The subject compounds can also be precursors to the synthesis of novel interlayered phosphates and oxides.