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TDDFT prediction of UV–vis absorption and emission spectra of tocopherols in different media

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Abstract

We use the TDDFT/PBE0/6-31+G* method to determine the electronic absorption and emission energies, in different media, of the four forms of tocopherol, which differ by the number and the position of methyl groups on the chromanol. Geometries of the ground state S0 and the first singlet excited state S1 were optimized in the gas phase, and various solvents. The solvent effect is evaluated using an implicit solvation model (IEF-PCM). Our results are compared to the experimental ones obtained for the vitamin E content in several vegetable oils. For all forms of tocopherols, the HOMO–LUMO first vertical excitation is a π–π* transition. Gas phase and non-polar solvents (benzene and toluene) give higher absorption wavelengths than polar solvents (acetone, ethanol, methanol, DMSO, and water); this can be interpreted by a coplanarity between the O-H group and the chroman, allowing a better electronic resonance of the oxygen lone pairs and the aromatic ring, and therefore giving an important absorption wavelength, whereas the polar solvents give high emission wavelengths comparatively to gas phase and non-polar solvents. Fluorescence spectra permit the determination, the separation, and the identification of the four forms of tocopherols by a large difference in emission wavelength values.

Scheme from process methodological to obtain the absorption and emission spectra for tocopherols

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Acknowledgments

Authors thank the Abdus Salam ICTP (International centre for Theoretical Physics) for their financial support to this work through the OEA-NET 45 project. K.B would like to thank Prof. Nadia Ouddai (University of El Hadj-Lakhdar Batna, Algeria), Prof. Samia Kaddour (University of Houari Boumediene Algiers, Algeria), for theirs material and moral supports, and William Mbogning Feudjio (University of Cameroon) for his helpful discussion.

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  1. Laboratoire de Thermodynamique et Modélisation Moléculaire (LTMM), Faculté de Chimie, USTHB BP 32, El Alia, 16111, Bab Ezzouar, Alger, Algeria

    Kahina Bakhouche & Dalila Hammoutène

  2. Laboratoire de Spectroscopie Atomique Moléculaire et Applications (LSAMA), Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus Universitaire, 1060, Tunis, Tunisia

    Zoubeida Dhaouadi & Souad Lahmar

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  1. Kahina Bakhouche
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  2. Zoubeida Dhaouadi
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Correspondence to Kahina Bakhouche.

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Bakhouche, K., Dhaouadi, Z., Lahmar, S. et al. TDDFT prediction of UV–vis absorption and emission spectra of tocopherols in different media. J Mol Model 21, 158 (2015). https://doi.org/10.1007/s00894-015-2706-1

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