Abstract
The L-tryptophan sublimation was studied by high-temperature mass spectrometry in the temperature range 395–493 K. The compound evaporates congruently in the form of monomeric molecules. The saturated vapor pressure at 485 K was determined by the Knudsen effusion method. In combination with mass spectrometric data, the pressure equation ln (p, Pa) = –(19943±304)/T + (40.568±0.688) is recommended for the temperature range 395–493 K. The enthalpy of 167.5±1.6 kJ/mol for sublimation at 298.15 K was determined on the basis of the second and third laws of thermodynamics.
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ACKNOWLEDGMENTS
The authors are grateful to E.V. Tyunina (G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences) for providing the L-tryptophan preparation and to N.A. Ermolaeva and L.B. Smirnova (Center for Collective Use of the Ivanovo State University of Chemistry and Technology) for recording IR spectra and performing thermogravimetric analysis of samples.
Funding
The scientific research was carried out with the support of the Ivanovo State University of Chemistry and Technology (grant no. 04-ISUCT/1-21).
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Translated from Zhurnal Obshchei Khimii, 2021, Vol. 91, No. 10, pp. 1490–1498 https://doi.org/10.31857/S0044460X21100036.
To the 90th Anniversary of A.V. Suvorov
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Motalov, V.B., Korobov, M.A., Dunaev, A.M. et al. Vapor Pressure and Thermodynamics of L-Tryptophan Sublimation. Russ J Gen Chem 91, 1938–1945 (2021). https://doi.org/10.1134/S1070363221100030
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DOI: https://doi.org/10.1134/S1070363221100030