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Stimuli-responsive protection of optically excited triplet ensembles against deactivation by molecular oxygen
N V Nazarova1, Yu S Avlasevich, K Landfester
1Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany. balouche@mpip-mainz.mpg.de.
Abstract:
Herein we demonstrate temperature-dependent sacrificial singlet oxygen scavenging properties of N-butyl-2-pyridone, ensuring efficient stimuli-responsive protection of densely populated excited triplet state ensembles against deactivation by molecular oxygen. As an acting external stimulus the temperature was chosen: it will be shown that at low temperature the concentration of singlet oxygen will be substantially lowered; in contrast, at elevated temperatures singlet oxygen will not be captured, and thus the optically excited densely populated triplet ensembles will be effectively depopulated. The singlet oxygen scavenging ability of N-butyl-2-pyridone demonstrates long-term protection of a triplet-triplet annihilation upconversion process against photooxidation.
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