Abstract
The solvation and the solvatochromic behavior of 5-(dimethylamino)-5′-nitro-2,2′-bithiophene 1, the basis of a π* scale of solvent polarities, was investigated theoretically in toluene, dichloromethane, methanol and formamide with a Monte Carlo and quantum mechanics (QM/MM) iterative approach. The calculated transition energies of the solvatochromic band of 1, obtained as averages of statistically uncorrelated configurations, including the solute and explicit solvent molecules of the first solvation layer, besides showing good agreement with the experimental transitions, reproduced very well the positive solvatochromism of this probe in various solvents.
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Acknowledgments
We are grateful to Freie Universität Berlin for computational facilities. We are also grateful to Professor Sylvio Canuto for allowing us access to DICE software. M.C.R. acknowledges the Fondo Nacional de Desarrollo Científico y Tecnológico FONDECYT project 1140212, and M.D. acknowledges the Fondo Nacional de Desarrollo Científico y Tecnológico FONDECYT project 11140497.
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Domínguez, M., Rezende, M.C. A Monte Carlo–quantum mechanics study of a solvatochromic π* probe. J Mol Model 22, 218 (2016). https://doi.org/10.1007/s00894-016-3083-0
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DOI: https://doi.org/10.1007/s00894-016-3083-0