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Laurdan solvatochromism: influence of solvent polarity and hydrogen bonds

M. BACALUM1,2,3, B. ZORILA1, M. RADU1,4, A. POPESCU2,*

Affiliation

  1. Department of Life and Environmental Physics, Horia Hulubei National Institute of Physics and Nuclear Engineering, Magurele, PO Box MG-6, 077125, Romania
  2. Department of Electricity, Solid State and Biophysics, Faculty of Physics, University of Bucharest, 405 Atomistilor, Magurele-Ilfov, Romania
  3. Biomedical Research Institute, Hasselt University, Agoralaan Bldg. C, B-3590 Diepenbeek, Belgium
  4. Department of Neurological, Neuropsychological, Morphological and Movement Sciences, Section of Anatomy and Histology, University of Verona, Le Grazie 8, Verona, 37134, Italy

Abstract

Laurdan solvatochromism is generally exploited in biological studies, but some of its properties are not completely elucidated. Two of them are related to the dipole moment of Laurdan and its possibility to form hydrogen bonds. Using solvatochromic methods we determined the Laurdan dipole moments both in the ground and excited states. Using different solvent polarity scales we observed that in the excited state aside from the effect of solvent polarity, a specific solvent effect appears. We showed that this specific effect is caused by hydrogen bonds formed between Laurdan and polar protic solvents..

Keywords

Laurdan, Solvent polarity, Lippert-Mataga equation, ETN polarity scale, Catalan polarity scale.

Citation

M. BACALUM, B. ZORILA, M. RADU, A. POPESCU, Laurdan solvatochromism: influence of solvent polarity and hydrogen bonds, Optoelectronics and Advanced Materials - Rapid Communications, 7, 5-6, May-June 2013, pp.456-460 (2013).

Submitted at: April 25, 2013

Accepted at: June 12, 2013