<br/>Two 5-(benzylidene) derivatives of thiobarbituric acid with different substituents on the phenyl rings have been synthesized by condensation of thiobarbituric acid with 4-dimethylaminobenzaldehyde or 4-methoxybenzaldehyde. Their optical properties have been investigated. It has been found that the isolated dye molecules are virtually nonluminescent in dilute solutions, but they become noticeably emissive upon aggregation in poor solvents, or in the solid state, showing a phenomenon of aggregation-induced emission. By varying the substituent on the phenyl ring from dimethylamino to methoxy group, the emission color is changed from red (maximum at 640 nm) to green (maximum at 530 nm). The possibility of tautomerization of thiobarbituric acid’s derivatives from the molecules containing two carbonyl groups and one C=S -group to molecules with two hydroxyl and one thiol groups have been discussed.<br/>

Absorbance and fluorescence spectra of 5-(benzylidene) derivatives of thiobarbituric acid

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.