Effect of coaggregate formation on the fluorescence quenching of anthracene derivatives by m-N,N-diethyl-aminophenyl carboxylates with different chain lengths as quenchers
✍ Scribed by Ji-Liang Shi; Zhi-Hai Qiu; Xi-Kui Jiang
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 85 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0894-3230
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✦ Synopsis
In the dioxane-H 2 O system, electron-transfer quenching processes have been observed between the excited 9-anthrylmethyl esters of butyric acid (A-4), caprylic acid (A-8), lauric acid (A-12) and palmitic acid (A-16) as fluorescence probes, and m-N-N-diethylaminophenyl esters of butyric acid (P-4), caprylic acid (P-8), lauric acid (P-12) and palmitic acid (P-16) as quenchers. The results indicate that the hydrophobic-lipophibic interaction (HLI)driven coaggregation of an acceptor and a donor can very effectively facilitate the electron-transfer quenching process between the excited acceptor (or donor) and the ground-state donor (or acceptor) after they become preassociated inside the coaggregate species. Furthermore, the extent of HLI-driven coaggregation (preassociation) between the acceptor and the donor may be assessed from the slope B of the equation
The chain-length effect and the effect of solvent aggregating power were also observed.