期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202114687
关键词
Dual-Responsiveness; Manipulation of Emulsion Stability; Spiropyrane Surfactant; Switchable Surfactants; pH-Dependent Photoresponsivity
资金
- European Research Council (ERC) [648365]
- German research council (DFG) [471323994]
- DFG (Emmy-Noether-Program) [HA 7725/2-1]
- University of Potsdam
- DFG [454020933]
- Projekt DEAL
- European Research Council (ERC) [648365] Funding Source: European Research Council (ERC)
A cationic surfactant with a spiropyrane unit was prepared, demonstrating adjustable surface-active characteristics with dual responsiveness. The reversible conversion of the spiropyrane unit to a zwitterionic merocyanine was controlled by adjusting pH value and light, resulting in pH-dependent photoactivity. The underlying switching processes were investigated and a thermodynamic explanation was provided. The complex stimuli-responsive behavior enables remote-control of colloidal systems and can be applied in pH-dependent manipulation of oil-in-water emulsions.
A cationic surfactant containing a spiropyrane unit is prepared exhibiting a dual-responsive adjustability of its surface-active characteristics. The switching mechanism of the system relies on the reversible conversion of the non-ionic spiropyrane (SP) to a zwitterionic merocyanine (MC) and can be controlled by adjusting the pH value and via light, resulting in a pH-dependent photoactivity: While the compound possesses a pronounced difference in surface activity between both forms under acidic conditions, this behavior is suppressed at a neutral pH level. The underlying switching processes are investigated in detail, and a thermodynamic explanation based on a combination of theoretical and experimental results is provided. This complex stimuli-responsive behavior enables remote-control of colloidal systems. To demonstrate its applicability, the surfactant is utilized for the pH-dependent manipulation of oil-in-water emulsions.
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