Variation in the sorption energy of esters ofn-perfluoroalkanoic acids on chromatographic phases of different polarity |
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| Authors: | E P Promyshlennikova V E Kirichenko K I Pashkevich D N Grigor'eva R V Golovnya |
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| Institution: | (1) Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 20 ul. S. Kovalevskoi, 620219 Ekaterinburg, Russian Federation;(2) Institute of Food Substances, Russian Academy of Sciences, 28 ul. Vavilova, 117813 Moscow, Russian Federation |
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| Abstract: | The contributions of methylene and difluoromethylene units of six homologous and six pseudohomologous series of esters ofn-perfluoroalkanoic acids to the differential molar free energy, enthalpy, and entropy of sorption on stationary phases of different polarities in glass capillary columns under isothermal conditions were calculated. The features observed characterize the peculiarities of the sorption of esters of polyfluorinated carboxylic acids on phases of different polarities and make it possible to estimate the enthalpy and entropy contributions to the energy of sorption of the esters, the effect of the temperature of the analysis and the length of the alkyl or polyfluoroalkyl chain on the retention parameters of the compound analyzed. The inversion of the retention order of trifluoroacetates and pentafluoropropionates in XE-60 nitrile-containing phase was found.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2051–2055, December, 1993. |
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| Keywords: | esters ofn-perfluoroalkanoic acids capillary GLC free energy enthalpy and and entropy of sorption homologous and pseudohomologous series inversion of the retention time the effect of temperature |
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