State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China.
Chemistry. 2010 Jul 19;16(27):8062-71. doi: 10.1002/chem.201000198.
A cationic dendritic molecule that has alkyl chains has been synthesized and employed to encapsulate anionic polyoxometalates through electrostatic interactions. The prepared surfactant-encapsulated polyoxometalate (SEP) complexes were used as building blocks to fabricate self-assemblies in solution and the solid state. Monodispersion, lamellar, and columnar assemblies of SEP complexes have been characterized in detail. With increasing the number of peripheral cationic dendrons on inorganic clusters, the SEPs undergo changes from globular assemblies to monodispersions in solution and from lamellar assemblies to hexagonal columnar structures in the solid state, depending on the amounts of cationic dendrons in the complexes. The structural evolvement was simulated through consideration of the size and shape of the cationic dendron and polyanionic clusters, and the experimental results are in good agreement with the interpretation of the simulations. The present research demonstrates a new kind of dendritic complex and provides a route for controlling their assembling states by simply alternating the number of cationic dendrons in the complexes.
一种带有烷基链的阳离子树枝状分子已被合成，并通过静电相互作用用于包裹阴离子多金属氧酸盐。所制备的表面活性剂包裹的多金属氧酸盐（SEP）配合物被用作在溶液中和固态中制造自组装的构建块。SEP 配合物的单分散体、层状和柱状组装体已被详细表征。随着无机簇上外围阳离子树枝状单元数量的增加，SEP 在溶液中从球形组装体转变为单分散体，在固态中从层状组装体转变为六方柱状结构，这取决于配合物中阳离子树枝状单元的数量。通过考虑阳离子树枝状单元和多阴离子簇的大小和形状，对结构演变进行了模拟，实验结果与模拟解释吻合良好。本研究展示了一种新型的树枝状配合物，并提供了一种通过简单改变配合物中阳离子树枝状单元的数量来控制其组装状态的途径。
