Solvent Dielectricity-Modulated Helical Assembly and Morphologic Transformation of Achiral Surfactant-Inorganic Cluster Ionic Complexes
Solvent Dielectricity-Modulated Helical Assembly and Morphologic Transformation of Achiral Surfactant-Inorganic Cluster Ionic Complexes
复制标题
非手性表面活性剂-无机簇离子配合物的溶剂介电调节螺旋组装和形态转变
DOI：
10.1021/acs.langmuir.7b01259
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发表时间：
2017
期刊：
影响因子：
3.9
通讯作者：
Wu Lixin
中科院分区：
文献类型：
--
作者：
Zhang Jing;Chen Xiaofei;Li Wen;Li Bao;Wu Lixin
采用单/双链阳离子表面活性剂和Lindqvist型多钼酸盐阴离子簇组成的离子配合物在有机溶液中进行可控自组装。在低介电常数的溶剂中，配合物自组装成扁平的带状层状聚集体，团簇位于中间，具有反双层结构。在增加介电常数的条件下，溶剂引发了螺旋自组装体的形成，最终由于双分子层的过度扭曲，螺旋自组装体由螺旋带转变为花状组装体。利用SEM、TEM和XRD对自组装体的形貌和亚结构进行了表征。通过1H NMR和IR光谱证实了有机阳离子和无机聚阴离子之间静电相互作用的变化对溶剂介电控制的形态转变的调制作用。在这项工作中的战略代表了一个有效的路线，在针对手性定向功能化的无机团簇结合可控和螺旋组装的非手性聚氧乙烯醚复合物在一个系统中。
Ionic complexes comprising single/double chain cationic surfactant and Lindqvist-type polyoxomolybdate anionic cluster were used for controlled self-assembly in organic solutions. In the solvent with low dielectric constant the complexes self-assembled into flat ribbon like lamellar aggregations with an inverse bilayer substructure where the cluster located at the middle. Under the condition of increased dielectric constant, the solvent triggered the formation of helical self-assemblies, which finally transformed from helical ribbons to the flower-like assemblies due to the bilayer becoming excessively twisted. The self-assembled morphology and the substructure were characterized by SEM, TEM, and XRD. The solvent dielectricity-controlled morphologic transformations modulated by the variation of electrostatic interactions between organic cations and inorganic polyanions were demonstrated by1H NMR and IR spectra. The strategy in this work represents an effective route in targeting the chirality-directed functionalization of inorganic clusters by combining controllable and helical assemblies of achiral polyoxometalate complexes in one system.