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QUENCHING OF INTRAMOLECULAR AMINE‐HYDROCARBON EXCIPLEX FLUORESCENCE BY WATER
Author(s) -
Ibemesi J. A.,
ElBayoumi M. Ashraf
Publication year - 1980
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.1751-1097.1980.tb03691.x
Subject(s) - excimer , photochemistry , chemistry , quenching (fluorescence) , intramolecular force , fluorescence , naphthalene , monomer , amine gas treating , pyrene , organic chemistry , polymer , physics , quantum mechanics
— The quenching of intramolecular exciplex fluorescence in 2,6‐bis(methylamino)naphtha]ene, (II), 2,6‐bis(/V‐methyl, methylamino)naphthalene, (III) and 2,6‐bis(N‐dimethy], methylamino)naphthalene, (IV) by water was investigated. Exciplex fluorescence intensity decreased continuously with increase in water concentration; while monomer fluorescence intensity remained constant up to 25% of water, followed by a rapid increase in intensity. Absorption spectra showed that specific interaction occurred between water and ground state amine molecules at high concentrations (25% by volume) of water. These observations were interpreted in terms of a static quenching involving the interaction of water with the ground‐state amine and a dynamic quenching involving the interactions of water with the exciplex. Our observations explain the greater efficiency of exciplex‐fluorescence quenching by protic polar solvents.