Premium
PHOTOLUMINESCENT PROPERTIES OF OCTADECYLRHODAMINE B IN WATER, IN ALCOHOLS AND IN MIXED WATER‐ALCOHOL SOLUTIONS
Author(s) -
Nakashima Kenichi,
Fujimoto Yoshinori
Publication year - 1994
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.1751-1097.1994.tb05148.x
Subject(s) - monomer , chemistry , fluorescence , alcohol , orb (optics) , methanol , solvent , ethanol , photochemistry , organic chemistry , polymer , optics , image (mathematics) , physics , artificial intelligence , computer science
Fluorescence, excitation and absorption spectra of octadecylrhodamine B (ORB) have been observed in solutions of water, methanol, ethanol and other simple alcohols. A remarkable increase in the ORB fluorescence intensity occurs when the probe is transferred from water to the alcohols. This effect is ascribed to the release of ORB fluorescent monomers from nonfluorescent multimers, which exist predominantly in water. The dependence of the fluorescence intensity on the composition of water‐alcohol binary solvent systems shows that hydrophobic interactions play an important role in the monomer = multimer equilibrium of ORB in these solutions. The fluorescence lifetimes of ORB in the alcohols are also reported.