Photoinduced intramolecular charge-transfer reactions in 4-amino-3-methyl benzoic acid methyl ester: A fluorescence study in condensedphase and jet-cooled molecular beams

Journal of Chemical Sciences

Amrita Chakraborty¹  Nikhil Guchhait1¹  Samiran Kar1¹  D N Nath² 

[1]Department of Chemistry, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009$$

[2]Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032$$

关键词: 4-Amino-3-methyl benzoic acid methyl ester;    fluorescence;    quantum yield;    laser-induced fluorescence;    density functional theory;    supersonic jet.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Photoinduced intramolecular charge-transfer reactions in 4-amino-3-methyl benzoic acid methyl ester (AMBME) have been investigated spectroscopically. AMBME, with its weak charge donor primary amino group, shows dual emission in polar solvents. Absorption and emission measurements in the condensed phase support the premise that the short wavelength emission band corresponds to local emission and the long wavelength emission band to the charge transfer emission. Laser-induced fluorescence excitation spectra show the presence of two low-energy conformers in jet-cooled molecular beams. Theoretical calculations using density functional theory help to determine structure, vibrational modes, potential energy surface, transition energy and oscillator strength for correlating experimental findings with theoretical results.

【 授权许可】

Unknown