Thermodynamics of trans/gauche conformational equilibria and vibrational spectra of 1,2-dihaloethanes in various media.
J Chem Phys
; 157(20): 204505, 2022 Nov 28.
Article
en En
| MEDLINE
| ID: mdl-36456242
ABSTRACT
The recently developed efficient protocols to implicit [Grimme et al., J. Phys. Chem. A 125, 4039-4054 (2021)] and explicit quantum mechanical modeling of non-rigid molecules in solution [Katsyuba et al., J. Phys. Chem. B 124, 6664-6670 (2020)] are used to describe conformational equilibria of 1,2-dichloroethane and 1,2-dibromoethane in various media. Two approaches for evaluation of trans/gauche free energy differences, ΔGt-g, are compared (a) direct ΔGt-g computation in implicit solution; (b) the use, together with experimental intensities, of infrared absorption coefficients and Raman scattering cross sections computed for each explicitly modeled solution. The same cluster model of a solute surrounded by the first solvation shell of solvent molecules was used to simulate both Raman and IR spectra. The good agreement between the two approaches indicates the reliability of both methods. The importance of using correct absorption coefficients and Raman scattering factors for each medium is discussed. The ΔGt-g estimates from both implicit and explicit solvation simulations were combined with experimentally measured enthalpy differences ΔHt-g available in the literature to obtain condensed-state ΔSt-g estimates.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Vibración
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
J Chem Phys
Año:
2022
Tipo del documento:
Article
País de afiliación:
Rusia