New Aspects on Fluorescence Quenching by Molecular Oxygen

in acetonitrile and become smaller than one-hundredth of the diffusion-controlled limit, kdiff. The kq's for AC in acetonitrile decrease up to 5.3 X l...
0 downloads 0 Views 590KB Size
5180

J. Am. Chem. SOC.1993,115, 518&5184

New Aspects on Fluorescence Quenching by Molecular Oxygen Koichi Kikuchi,' Chika Sato, Masanori Watabe, Hiroshi Ikeda, Yasutake Takahashi, and Tsutomu Miyashi Contribution from the Department of Chemistry, Faculty of Science, Tohoku University, Aoba, Aramaki, Aoba- ku, Sendai 980, Japan Received May 4, I992

Abstract: Fluorescence quenching rate constants k, by molecular oxygen 302(3&-) were measured for four anthracenecarbonitriles (AC) in acetonitrile and benzene and for five acridinium ions in acetonitrile. The k