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Updated: Mar 16, 2026

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Published on: July 19, 2019
A Monte Carlo-quantum mechanics study of a solvatochromic π* probe
Moisés Domínguez1,2, Marcos Caroli Rezende3,4
1Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Bernando O'Higgins 3363, Santiago, Chile. moises.dominguez@usach.cl.
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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