Quenching of Fluorescence of Polycyclic Aromatic Hydrocarbons by 4-OH-TEMPO

Abstract

The quenching of fluorescence of four polycyclic aromatic hydrocarbons (anthracene, benzo(a)anthracene, pyrene, and fluoranthene) by 4-OH-TEMPO was investigated in 5% Triton X-100 in the temperature range from 15 to 55°C. No deviations from linearity in the Stern-Volmer plots were observed. The quenching mechanism was found to be entirely dynamic. The quenching rate constants were obtained for all temperatures studied. The findings demonstrate the possibility of developing an analytical method for the quantitative determination of nitrogen dioxide radical scavenger, 4-OH-TEMPO.

Keywords:

• 4-OH-TEMPO
• Fluorescence quenching
• Polycyclic aromatic hydrocarbons
• Static and dynamic quenching

Acknowledgments

This work was financially supported by the Polish Ministry of Science and Higher Education under grants N N204 136238 and DS/8232-4-0088-1.