Abstract:

The fluorescence emission spectra and UV absorption spectra of three series compounds with D-A structure in five different polar solvents were studied, and the solvatochromism of compounds were also disussed. The results showed that all compounds had different fluorescence emission wavelengths in five different polar solvents, the largest was that in methanol and the smallest was that in cyclohexane, but in dioxane, tetrahydrofuran and dichloromethane, the emission wavelengths occurred red-shifted with the decrease of polarity of the solvent, and the fluorescence intensities varied in different polar solvents. The UV absorption wavelengths of compounds were affected by the polarities of solvents, they all had the minimum absorption wavelength in methanol. The absorbance of compounds in different polar solvents were also different, and those in methanol and cyclohexane were higher than others. All the properties above indicated that these three series of compounds had potential to be used as fluorescent probes to detect the polarity of the environment.

Key words: triarylamine, D-A structure, fluorescence emission spectra, UV absorption spectra, solvatochromism