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Int. J. Mol. Sci. 2008, 9(7), 1321-1332; doi:10.3390/ijms9071321

Application of Electron Paramagnetic Resonance Spectroscopy for Validation of the Novel (AN+DN) Solvent Polarity Scale

1
Department of Biophysics, Universidade Federal de Sao Paulo (Unifesp), Rua 3 de Maio 100, CEP 04044-020, São Paulo, SP, Brazil
2
Department of Biochemistry, Institute of Chemistry, Universidade de Sao Paulo, Sao Paulo, Brazil
3
Instituto Israelita de Ensino e Pesquisa Albert Einstein, Sao Paulo, SP, Brazil
*
Author to whom correspondence should be addressed.
Received: 24 April 2008 / Revised: 3 July 2008 / Accepted: 4 July 2008 / Published: 17 July 2008
(This article belongs to the Section Physical Chemistry, Theoretical and Computational Chemistry)
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Abstract

Based on solvation studies of polymers, the sum (1:1) of the electron acceptor (AN) and electron donor (DN) values of solvents has been proposed as an alternative polarity scale. To test this, the electron paramagnetic resonance isotropic hyperfine splitting constant, a parameter known to be dependent on the polarity/proticity of the medium, was correlated with the (AN+DN) term using three paramagnetic probes. The linear regression coefficient calculated for 15 different solvents was approximately 0.9, quite similar to those of other well-known polarity parameters, attesting to the validity of the (AN+DN) term as a novel “two-parameter” solvent polarity scale.
Keywords: polarity; solvent; EPR; spin label; isotropic hyperfine splitting constant polarity; solvent; EPR; spin label; isotropic hyperfine splitting constant
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Malavolta, L.; Poletti, E.F.; Silva, E.H.; Schreier, S.; Nakaie, C.R. Application of Electron Paramagnetic Resonance Spectroscopy for Validation of the Novel (AN+DN) Solvent Polarity Scale. Int. J. Mol. Sci. 2008, 9, 1321-1332.

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