TY  - JOUR
A1  - Reifarth, Martin
A1  - Bekir, Marek
A1  - Bapolisi, Alain M.
A1  - Titov, Evgenii
A1  - Nusshardt, Fabian
A1  - Nowaczyk, Julius
A1  - Grigoriev, Dmitry
A1  - Sharma, Anjali
A1  - Saalfrank, Peter
A1  - Santer, Svetlana
A1  - Hartlieb, Matthias
A1  - Böker, Alexander
T1  - A dual pH- and light-responsive spiropyrane-based surfactant
BT  - investigations on Its switching behavior and remote control over emulsion stability
JF  - Angewandte Chemie : a journal of the Gesellschaft Deutscher Chemiker ; International edition
N2  - 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.
KW  - Dual-Responsiveness
KW  - Manipulation of Emulsion Stability
KW  - Spiropyrane
KW  - Surfactant
KW  - Switchable Surfactants
KW  - pH-Dependent Photoresponsivity
Y1  - 2022
U6  - https://doi.org/10.1002/anie.202114687
SN  - 1433-7851
SN  - 1521-3773
VL  - 61
IS  - 21
PB  - Wiley-VCH
CY  - Weinheim
ER  -