Aufbau principle of complex open-framework structures of metal phosphates with different dimensionalities.
Aufbau principle of complex open-framework structures of metal phosphates with different dimensionalities.
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DOI：
10.1021/ar000135
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发表时间：
2001
影响因子：
18.3
通讯作者：
C. Rao;Srinivasan Natarajan;A. Choudhury;S. Neeraj;A. A. Ayi-A.
中科院分区：
文献类型：
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作者：
C. Rao;Srinivasan Natarajan;A. Choudhury;S. Neeraj;A. A. Ayi-A.
开放骨架金属磷酸盐以一维 (1D) 链或梯子、二维 (2D) 层和复杂的三维 (3D) 结构的形式出现。最近也分离出了零维单体。这些材料传统上是在有机胺存在下通过水热法制备的，但胺磷酸盐与金属离子的反应为合成提供了一条简便的途径，也为这些迷人结构的形成模式提供了一些线索。对结构良好的单相磷酸锌转变的仔细研究表明，1D 结构转变为 2D 和 3D 结构，而 2D 结构转变为 3D 结构。零维单体转变为 1D、2D 和 3D 结构。有理由相信，由四元环组成的0D单体是开放框架磷酸酯最基本的结构单元，并且在形成最佳前体状态（例如梯形结构）后，可能会自发发生进一步的构建。最终产品中一维起始材料的结构特征的存在提供了复杂结构形成过程中自组装发生的证据。这些观察构成了我们理解这种复杂结构的构建原理的开始。
Open-framework metal phosphates occur as one-dimensional (1D) chains or ladders, two-dimensional (2D) layers, and complex three-dimensional (3D) structures. Zero-dimensional monomers have also been isolated recently. These materials are traditionally prepared by hydrothermal means, in the presence of organic amines, but the reactions of amine phosphates with metal ions provide a facile route for the synthesis, and also throw some light on the mode of formation of these fascinating architectures. Careful studies of the transformations of monophasic zinc phosphates of well-characterized structures show that the 1D structures transform to 2D and 3D structures, while the 2D structures transform to 3D structures. The zero-dimensional monomers transform to 1D, 2D, and 3D structures. There is reason to believe that the 0D monomers, comprising four-membered rings, are the most basic structural units of the open-framework phosphates and that after an optimal precursor state, such as the ladder structure, is formed, further building may occur spontaneously. Evidence for the occurrence of self-assembly in the formation of complex structures is provided by the presence of the structural features of the one-dimensional starting material in the final products. These observations constitute the beginning of our understanding of the building-up principle of such complex structures.