10.1021/acs.langmuir.7b01259.s001 Jing Zhang Jing Zhang Xiaofei Chen Xiaofei Chen Wen Li Wen Li Bao Li Bao Li Lixin Wu Lixin Wu Solvent Dielectricity-Modulated Helical Assembly and Morphologic Transformation of Achiral Surfactant-Inorganic Cluster Ionic Complexes American Chemical Society 2017 cluster SEM helical self-assemblies TEM Solvent Dielectricity-Modulated Helical Assembly Achiral Surfactant-Inorganic Cluster Morphologic Transformation lamellar aggregations IR spectra assembly XRD bilayer substructure Lindqvist-type polyoxomolybdate complexes self-assembled helical ribbons 1 H NMR flower-like assemblies self-assembled morphology dielectric helical assemblies chirality-directed functionalization achiral polyoxometalate complexes 2017-10-19 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Solvent_Dielectricity-Modulated_Helical_Assembly_and_Morphologic_Transformation_of_Achiral_Surfactant-Inorganic_Cluster_Ionic_Complexes/5545354 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 by <sup>1</sup>H 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.