Direct observation of the excited-state proton transfer and decay kinetics of internally hydrogen-bonded photostabilizers in copolymer films
Abstract
The excited-state dynamics of a 2-hydroxyphenylbenzotriazole (HPB) photostabilizer copolymerized with polystyrene are reported. HPB fluorescence from these copolymer films is observed at ≈630 nm, characteristic of the proton-transferred excited state of HPB, and it has a risetime of <10 ps and a decay time of 28±4 ps at room temperature. Measurement of the relative fluorescence quantum yield as a function of temperature gives the activation energy for non-radiative decay of this state to be E/hc = 259±25 cm -1.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- November 1985
- DOI:
- 10.1016/0009-2614(85)87206-7
- Bibcode:
- 1985CPL...121..417O
- Keywords:
-
- Copolymers;
- Emission Spectra;
- Photochemical Reactions;
- Polymeric Films;
- Protons;
- Stabilizers (Agents);
- Fluorescence;
- Hydrogen Bonds;
- Intramolecular Structures;
- Quantum Efficiency;
- Reaction Kinetics;
- Atomic and Molecular Physics