Abstract
The solvent and polymer matrix effects on the conformation equilibrium in 1,1,2,2-tetrabromoethane (TBE) are investigated by IR spectroscopy. The free energy differences (ΔG0) of TBE conformations correlate with the dielectric permittivity function of the medium. A pronounced solvent effect on the absolute integrated intensities of the IR bands arising from the C-H stretching vibrations indicates H-bonding between the C-H groups of TBE and the solvent. The enthalpies of specific interactions due to hydrogen bonding were estimated using the intensity rule (1–3 kcal/mole). The absence of correlations between ΔG0 and the solvent basicity parameter leads us to conclude that the trans- and gosh-conformers of TBE form nearly equally strong hydrogen bonds.
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Kazan State University. Kazan State Technological University. Translated fromZhurnal Strukturnoi Khimii, Vol. 39, No. 3, pp. 478–483, May–June, 1998.
This work was supported by RFFR grant No. 96-03-32171a.
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Stolov, A.A., Vinokurova, E.A., Kamalova, D.I. et al. Hydrogen bonds involving C-H groups of 1,1,2,2-tetrabromoethane and their effect on the conformation equilibrium. J Struct Chem 39, 388–392 (1998). https://doi.org/10.1007/BF02873647
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DOI: https://doi.org/10.1007/BF02873647