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

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Abstract

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.

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Authors and Affiliations

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

    Amrita Chakraborty, Samiran Kar & Nikhil Guchhait

  2. Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700 032, India

    D N Nath

  3. CHEMGEN Pharma International, Dr. Siemens Street, Bolck GP, Sector V, Salt Lake City, Kolkata, 700 091, India

    Samiran Kar

Authors
  1. Amrita Chakraborty
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  2. Samiran Kar
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  3. D N Nath
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  4. Nikhil Guchhait
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Correspondence to Nikhil Guchhait.

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Chakraborty, A., Kar, S., Nath, D.N. et al. Photoinduced intramolecular charge-transfer reactions in 4-amino-3-methyl benzoic acid methyl ester: A fluorescence study in condensed-phase and jet-cooled molecular beams. J Chem Sci 119, 195–204 (2007). https://doi.org/10.1007/s12039-007-0027-3

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  • DOI: https://doi.org/10.1007/s12039-007-0027-3

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