5-(Benzylidene)pyrimidine-2,4,6-triones with different substituents on the phenyl rings are synthesized, and their optical properties are investigated. Whereas the isolated dye molecules are virtually nonluminescent in dilute solutions, they become highly emissive upon solution thickening or aggregation in poor solvents, or in the solid state, showing a phenomenon of aggregation-induced emission (AIE). By varying the substituent on the phenyl ring from dimethylamino to methoxy group, the emission color is changed from red (maximum at 630 nm) to green (maximum at 540 nm). Theoretical calculation shows that the AIE characteristics of the dye molecules are resulted from intermolecular interactions. Utilizing such feature, the molecules can be employed as fluorescent probes and detected the ethanol content in aqueous solutions.<br/>

Absorbance and fluorescence spectra of 5-(benzylidene)pyrimidine-2,4,6-triones

255th National Meeting (2018)

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