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The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

Abstract Volume 20 (2015) pp 176-182

Solvent Effects on The Electronic Absorption Spectra of Thymol

Naser Abdulhasan Naser*, Muhammad Kadhim Musa, Ameer Ali Hussein, and Zahraa Khalid Saleh

Department of Chemistry, Faculty of science, University of Kufa, P.O. Box (21), Najaf Governorate, IRAQ,
Received March 10, 2015. Accepted May 21, 2015.

Published: 17 July 2015

Abstract. The electronic absorption spectra of thymol have been recorded and studied in various solvents of different polarities. Multiple linear regression technique was applied to calculate the regression and correlation coefficients based on an equation that relates the wavenumbers of the absorption band maxima (νmax) to the empirical Kamlet–Taft solvent parameters, π* (dipolarity/polarizability), β (solvent hydrogen-bond donor acidity) and α (solvent hydrogen-bond acceptor basicity). The regression fits obtained from this analysis allows estimating the contribution of each type of interactions relative to total spectral shifts in solution. The dependence of νmax on the solvent parameters indicates that the obtained bands are affected by specific and non-specific solute-solvent interactions.

Key Words: Laboratories and Demonstrations; analytic chemistry; Thymol; Kamelt-Taft equation; Linear solvation energy relationship; Solvatochromism

(*) Corresponding author. (E-mail:

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