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Solvent Dielectricity-Modulated Helical Assembly and Morphologic Transformation of Achiral Surfactant-Inorganic Cluster Ionic Complexes
journal contribution
posted on 2017-10-19, 00:00 authored by Jing Zhang, Xiaofei Chen, Wen Li, Bao Li, Lixin WuIonic
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
by 1H 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.
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Keywords
clusterSEMhelical self-assembliesTEMSolvent Dielectricity-Modulated Helical AssemblyAchiral Surfactant-Inorganic ClusterMorphologic Transformationlamellar aggregationsIR spectraassemblyXRDbilayer substructureLindqvist-type polyoxomolybdatecomplexes self-assembledhelical ribbons1 H NMRflower-like assembliesself-assembled morphologydielectrichelical assemblieschirality-directed functionalizationachiral polyoxometalate complexes
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