Premium
QUENCHING OF FLUORESCENCE OF AROMATIC HYDROCARBONS BY PROTONS IN CAFFEINE‐ SOLUBILIZED AQUEOUS SOLUTION. INTRACOMPLEX ENERGY TRANSFER
Author(s) -
Nosaka Yoshio,
Kira Akira
Publication year - 1991
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1991.tb02001.x
Subject(s) - chemistry , aqueous solution , quenching (fluorescence) , pyrene , fluoranthene , caffeine , fluorescence , sulfuric acid , photochemistry , protonation , hydrocarbon , inorganic chemistry , organic chemistry , medicine , ion , physics , quantum mechanics , endocrinology
The fluorescence of pyrene and five other aromatic hydrocarbons solubilized with caffeine in aqueous solution was quenched by 0.001–1mol dm −3 sulfuric acid; this quenching did not occur in the absence of caffeine. Exceptionally a non‐alternative hydrocarbon, fluoranthene, showed an increase of the fluorescence intensity by the acid. The observed quenching rate was explained by the rate of energy transfer from the aromatic molecules to protonated caffeine in the complex.