Direct observation of the excited-state proton transfer and decay kinetics of internally hydrogen-bonded photostabilizers in copolymer films

✍ Scribed by Donald B. O'Connor; Gary W. Scott; Daniel R. Coulter; Amitava Gupta; S.P. Webb; Sheila W. Yeh; J.H. Clark

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 467 KB
• Volume: 121
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(85)87206-7

✦ Synopsis

The excited-sure dynamics 01 a 2-hydrolryphenylbenzorriazDle (HPB) pholostabilizer copolymerized wilh polystyrene are reported. HPB fluorescence rrom these copolymer films is observed at = 630 nm. characteristic of the proton-transrerred excited state of HP@. and il has a risetime of c 10 ps and a decay time 0128 _C4 ps at room temperature. Measurement 01 the relative fluorescence quantum yield as a function or temperature gives the activation energy for non-radiative decay or this sm~e LO be E/he= 259f25 cm-'.