Journals / Turkish Journal of Chemistry / 2000 / Cilt: 24 - Sayı: 2
High fluorescence emissions of some natural benzofurane derivatives isolated from Styrax officinalis
- Journal
- Turkish Journal of Chemistry
- Pages
- 199–207
- DOI
- —
Abstract
The fluorescent properties of several natural benzofuran derivatives, egonols, isolated from {\it Styrax officinalis}, were determined. The studied egonol derivatives were found to be effective UV organic luminophores, with quantum yields of near to unity, \( jf \) = 0.92. The fluorescence quenching experiments with electron donor molecules of aniline, N,N-dimethylaniline and carbazolocarbazole, presented very high efficiency of quenching at above diffusion quenching rates of 4.5\times10\( 10 \), 2.1\times10\( \times \) and 5.6\times10\( 12 \) s\( -1 \)mol\( -1 \), respectively. A strong electron acceptor molecule, tetranitrofluorenone, presented quenching rate of 2.6\times10\( 11 \) s\( -1 \)mol\( -1 \). It is concluded that the first excited singlet state of egonol molecule is a more efficient electron acceptor.
Özet
The fluorescent properties of several natural benzofuran derivatives, egonols, isolated from {\it Styrax officinalis}, were determined. The studied egonol derivatives were found to be effective UV organic luminophores, with quantum yields of near to unity, \( jf \) = 0.92. The fluorescence quenching experiments with electron donor molecules of aniline, N,N-dimethylaniline and carbazolocarbazole, presented very high efficiency of quenching at above diffusion quenching rates of 4.5\times10\( 10 \), 2.1\times10\( \times \) and 5.6\times10\( 12 \) s\( -1 \)mol\( -1 \), respectively. A strong electron acceptor molecule, tetranitrofluorenone, presented quenching rate of 2.6\times10\( 11 \) s\( -1 \)mol\( -1 \). It is concluded that the first excited singlet state of egonol molecule is a more efficient electron acceptor.