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V. G. Badelin¹, V. V. Tyunina², A. V. Krasnov²

Author affiliations
¹G. A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
Akademicheskaya str. 1, 153045 Ivanovo, Russia.
E-mail: vgb@isc-ras.ru
²Ivanovo State University of Chemistry and Technology, Physical Department,
153460 Ivanovo, Av. F. Engel’s, 7. 

Abstract
By mass-spectrometry method the process of sublimation of DL-α- alanyl-DL-α-valine aliphatic dipeptide was investigated. The range of temperatures in which there is a sublima-tion of a substance as monomeric molecular forms was determined. The value of sublimation enthalpy of the dipeptide was obtained for the first time. Using semi-empirical methods of quantum chemistry (AM1), the calculations of energy of H-bond formation between molecules in crystal form of DL-α- alanyl-DL-α-valine were carried out.

Keywords: sublimation, enthalpy of sublimation, DL-α-alanyl-DL-α-valine, energy of H-bond formation in crystal