Abstract
In this article, recent studies on the pressure dependence of the bimolecular fluorescence quenching with a nearly diffusion-controlled rate in liquid and supercritical fluid were reviewed. In liquid solution, the pressure dependence of the quenching rate constant, kq, by heavy atom quenchers and oxygen was successfully analyzed by taking into account the pressure dependence of radial distribution function. The analysis was applied to the quenching systems in supercritical CO2, and it was found that the treatment is applicable to the fluorescence quenching of 9,10-dimethylanthracene by oxygen and CBr4 with high kq, but not to that of 9-cyanoanthracene by oxygen with lower kq.
