Anomalous solvent effects on the twisted intramolecular charge transfer fluorescence of ethyl 4-(N,N-dimethylamino)benzoate in chlorinated solvents

Abstract

It was found that the TICT (twisted intramolecular charge transfer) fluorescence of the title compound was very different in chlorinated solvents in comparison with other solvent systems. The emission energy from the a* state (charge transfer state) is higher and the intensity ratio, R=I a /I b where I a and I b are the emission intensity from the a* state and from the local excited state, is lower at room temperature in CHCl 3 and butyl chloride than in nonchlorinated solvents