Abstract
The thermodynamic characteristics of adsorption (TCA) of thiophene and its derivatives are determined under the conditions of equilibrium gas adsorption chromatography (GAC) on columns with graphitized thermal carbon black (GTCB) of Carbopack C HT grade. It is shown that the TCA values depend largely on the number and nature of the substituents in the main structural fragment. It is found that the surface of the GTCB is characterized by low structural selectivity for positional isomers in the series of thiophene derivatives. The effect of polar retention of an adsorbate on graphite from the gas phase due to additional intermolecular specific interactions of polar groups of the adsorbate with an easily polarizable surface of the base face of graphite is established and studied. Conclusions are reached on the applicability of the two-dimensional ideal gas model for describing the mobility of strongly polar molecules of thiophene derivatives on surfaces of graphite, and on the considerable limitations of this model when applied to the adsorption of thiophene molecules, along with its methyl and halogen derivatives.
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ACKNOWLEDGMENTS
The authors are grateful to A.V. Yudashkin and V.V. Meshkova for providing samples of thiophene derivatives used in this work.
Funding
This work was supported by the Russian Foundation for Basic Research, project no. 16-43-630634 p_a; and by the RF Ministry of Science and Higher Education as part of State Task no. 4.6328.2017/8.9 for Samara State University, “Thermodynamics of Intermolecular Interactions in Systems with 2D and 3D Types of Structural Selectivity.”
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Yashkin, S.N., Yashkina, E.A., Svetlov, D.A. et al. Adsorption and Chromatographic Separation of Thiophene Derivatives on Graphitized Thermal Carbon Black. Russ. J. Phys. Chem. 93, 2482–2489 (2019). https://doi.org/10.1134/S0036024419120355
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DOI: https://doi.org/10.1134/S0036024419120355