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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2009, 3, 67—73.
Sublimation Enthalpy of Aliphatic Dipeptide of DL-α-Alanyl-DL-α-Valine and Energy of Hydrogen Bonds in the Crystal
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: email@example.com 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