Abstract
The emission spectra of hexadecyl 2-naphthoate (HN) and hexadecyl dansyl (HD) in aqueous organic binary solvents were investigated. The fluorescence spectrum of HN in 1,4-dioxane-water (DX-H 2O) mixture solvents is dominated by excimer emission. The addition of a long-chain hydrocarbon such as octadecane results in a reduction in the excimer emission and in an enhancement of the monomer emission. The fluorescence of HD in DX-H 2O is blue shifted and enhanced in comparison with that in organic solvents with similar polarity. In the mixture solution of HN and HD in DX-H 2O, singlet energy transfer with high efficiency is demonstrated. All these observations suggest that hydrophobic interactions force molecules with long hydrocarbon chains to form aggregates in aqueous organic binary solvents.
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