IR Spectroscopy of Conformational Transitions in Molecules of 1,2-Dichloroethane and 1,1,2,2-Tetrabromoethane Infiltrated into Nanoporous Glasses

Abstract

The results of studying IR absorption spectra under the condition of frustrated total internal reflection of 1,2-dichloroethane and 1,1,2,2-tetrabromoethane in porous glasses with different pore radii are presented. Changes in the intensities of trans-conformation and gauche conformation in the studied systems for various pore radii of glass \(R\) are found. The dependences of the differences in free energies of trans-conformation and gauche conformation for 1,2-dichloroethane and 1,1,2,2-tetrabromoethane on the pore radius of porous glass are obtained. At \(R>3.5\) nm, the number of \(g\)-conformers for 1,2-dichloroethane increases, while the number of \(t\)-conformers for 1,1,2,2-terabromoethane increases.

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Correspondence to Yu. V. Starokurov or A. V. Bykov or A. M. Saletsky.

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Translated by I. P. Obrezanova

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Starokurov, Y.V., Bykov, A.V. & Saletsky, A.M. IR Spectroscopy of Conformational Transitions in Molecules of 1,2-Dichloroethane and 1,1,2,2-Tetrabromoethane Infiltrated into Nanoporous Glasses. Moscow Univ. Phys. 75, 76–80 (2020). https://doi.org/10.3103/S0027134920010130

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Keywords:

  • IR spectra
  • porous glasses
  • trans-conformation
  • gauche conformation
  • 1
  • 2-dichloroethane
  • 1
  • 1
  • 2
  • 2-tetrabromoethane
  • free energy of conformation