TY - JOUR
T1 - Adsorption of Rose Bengal on a self-assembled fibrillar network affords a thermally switchable oxygenation photocatalyst and a thermochromic soft material
AU - Arnau-del-Valle, Carla
AU - Felip-León, Carles
AU - Angulo-Pachón, César A.
AU - Galindo, Francisco
AU - Miravet, Juan F.
PY - 2020/1/15
Y1 - 2020/1/15
N2 - Rose Bengal (RB) can be homogeneously dispersed in dichloromethane by its adsorption on the fibrillar network of a molecular gel formed in this solvent. The RB loaded gel was visualized by confocal scanning laser microscopy, revealing homogenous distribution all over the self-assembled fibers. Thermal gel disassembly provokes discoloration of the system because of protonation of RB by the acidic molecular gelator. Thermochromism was evaluated by UV–vis spectroscopy, showing that color change is fully reversible and associated with gel assembly/disassembly, as corroborated by 1H NMR determination of the amount of free gelator. Singlet oxygen photogeneration from the RB-loaded gel was assayed using 9,10-dimethylanthracene as a 1O2 trap. It was found that the photosensitizing activity of the system is on /off thermally switched, controlled by reversibly gel formation, resulting in a smart thermoresponsive photocatalytic material.
AB - Rose Bengal (RB) can be homogeneously dispersed in dichloromethane by its adsorption on the fibrillar network of a molecular gel formed in this solvent. The RB loaded gel was visualized by confocal scanning laser microscopy, revealing homogenous distribution all over the self-assembled fibers. Thermal gel disassembly provokes discoloration of the system because of protonation of RB by the acidic molecular gelator. Thermochromism was evaluated by UV–vis spectroscopy, showing that color change is fully reversible and associated with gel assembly/disassembly, as corroborated by 1H NMR determination of the amount of free gelator. Singlet oxygen photogeneration from the RB-loaded gel was assayed using 9,10-dimethylanthracene as a 1O2 trap. It was found that the photosensitizing activity of the system is on /off thermally switched, controlled by reversibly gel formation, resulting in a smart thermoresponsive photocatalytic material.
KW - Photosensitizers
KW - Self-assembly
KW - Soft materials
KW - Supramolecular gels
KW - Thermochromism
UR - http://www.scopus.com/inward/record.url?scp=85073555250&partnerID=8YFLogxK
U2 - 10.1016/j.jphotochem.2019.112142
DO - 10.1016/j.jphotochem.2019.112142
M3 - Article
AN - SCOPUS:85073555250
VL - 387
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
M1 - 112142
ER -