Lowest excited singlet states of α-9-anthrylpolyenes

✍ Scribed by N. Holl; P. Emele; H. Port; H.C. Wolf; H. Strobel; T. Kesmarszky; F. Effenberger

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 518 KB
• Volume: 205
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)85161-g

✦ Synopsis

Propert& of the electronically excited states of a-9-anthrylpolyenes are studied in n-hexane solutions by using optical absorption, emission and fluorescence excitation spectroscopy. The absorption spectra reveal a complex structure with contributions of both anthracene and polyene type bands but also of bands with mixed anthraoene/polyene character. Small amounts of remaining impurities are chemically not separable but can be detected via fluorescence measurements. By computer-aided decomposition of spectra measured under variable selective excitation the actual, clearly chain-length dependent, fluorescences could be obtained. The fluorescence quantum yield drastically decreases from +0.75 at n= 1 to + 10v4 at n=5, whereas the radiative lifetime increases.