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Solvatochromic Effect on the Photophysical Properties of Two Coumarins

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Abstract

The absorption and emission spectra of two coumarins namely 7, 8 benzo-4-azidomethyl coumarin (C1) and 6-methoxy-4-azidomethyl coumarin (C2) have been recorded at room temperature in solvents of different polarities. The ground state dipole moments (μ g ) of two coumarins were determined experimentally by Guggenheim method. The exited state (μ e ) dipole moments were estimated from Lippert’s, Bakhshievs and Chamma-Viallet’s equations by using the variation of Stoke’s shift with the solvent dielectric constant and refractive index. The ground and excited state dipole moments were calculated by means of solvatochromic shift method and also the excited state dipole moments are determined in combination with ground state dipole moments. It was observed that dipole moments of excited state were higher than those of the ground state, indicating a substantial redistribution of the π-electron densities in a more polar excited state for two coumarins.

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Acknowledgements

The author (RMM) is grateful to Dr. K. Rajanikanth, Principal, M.S.R.I.T, Dr. K. Venkatesh, H O D, Department of Physics, M.S.R.I.T and The Management of M.S.R.I.T, Bangalore.

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Authors and Affiliations

  1. Department of Physics, M. S. Ramaiah Institute of Technology, Bangalore, 560054, India

    Raveendra M. Melavanki

  2. Department of Physics, Basaveshwar Science College, Bagalkot, 587101, Karnataka, India

    H. D. Patil

  3. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, India

    Siva Umapathy

  4. Department of Physics, Karnatak University, Dharwad, 580003, Karnataka, India

    J. S. Kadadevarmath

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  1. Raveendra M. Melavanki
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  2. H. D. Patil
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  3. Siva Umapathy
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  4. J. S. Kadadevarmath
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Correspondence to Raveendra M. Melavanki.

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Melavanki, R.M., Patil, H.D., Umapathy, S. et al. Solvatochromic Effect on the Photophysical Properties of Two Coumarins. J Fluoresc 22, 137–144 (2012). https://doi.org/10.1007/s10895-011-0939-7

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  • DOI: https://doi.org/10.1007/s10895-011-0939-7

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