Abstract
Abstract— 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.
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