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The construction and modulation of photoelectric functional hierarchical materials based on ionic self-assembly

Sui, Pengliang, Sun, Ning, Jiang, Qiuyan, Luo, Dongqin, Li, Qiuhong, Li, Aixiang, Cong, Rimin, Si, Weimeng
Colloids and surfaces 2019 v.565 pp. 30-35
alizarin, ammonium, beta-cyclodextrin, colloids, electrostatic interactions, fluorescence, hydrophobicity, pH, surfactants
The photoelectric functional hierarchical materials have been successfully prepared by the simple ionic self-assembly (ISA) strategy from the cationic ferrocenyl surfactant, 16-alkyl (ferrocenyl-methyl)ammonium bromide (Fc16AB) and the anionic alizarin red (AR). The obtained complexes exhibited multiple stimuli-responsive switching behaviour triggered by β-cyclodextrin (β-CD) inclusion, redox species, and pH. The switching mechanism corresponding to each stimulus was studied in detail. Moreover, the fluorescent intensity of binary complexes could be modulated by the concentration of Fc16AB and redox of ferrocene part. The fluorescence switching mechanism upon redox stimulus was studied in detail. Both the complexes fabrication and transition mechanisms were found to be controlled by the inclusion equilibrium and the cooperative binding of noncovalent interactions, including the electrostatic interactions, π-π stacking, and amphiphilic hydrophobic association. This work provides a deep understanding of electro-photo molecular switching device.