Minimum in the temperature dependence of the Kováts retention indices of nitroalkanes and alkanenitriles on an apolar phase

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Abstract

The Kováts retention indices (I) of 1-nitroalkanes and alkanenitriles were determined on polydimethylsiloxane and Innowax (polyethylene glycol) columns in a wide temperature range. The temperature dependence of the retention indices exhibits a definite minimum for the early members of the homologous series. The position of the minimum shifts to lower temperatures with increasing carbon atom number of the solute. The thermodynamic explanation of an extreme in the I vs. T function is the higher solvation heat capacities of nitroalkanes and alkanenitriles relative to those of the reference n-alkanes, owing to the deviation from the ideal state in the solution. A novel equation was derived which describes the minimum in the I vs. T function, too.

Original languageEnglish
Pages (from-to)11-19
Number of pages9
JournalJournal of Chromatography A
Volume985
Issue number1-2
DOIs
Publication statusPublished - Jan 24 2003

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Temperature
Alkanes
Solvation
Thermodynamics
Specific heat
Carbon
Hot Temperature
Atoms
baysilon

Keywords

  • Alkanenitriles
  • Heat capacity
  • Nitroalkanes
  • Retention indices
  • Temperature effects
  • Thermodynamic parameters

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

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title = "Minimum in the temperature dependence of the Kov{\'a}ts retention indices of nitroalkanes and alkanenitriles on an apolar phase",
abstract = "The Kov{\'a}ts retention indices (I) of 1-nitroalkanes and alkanenitriles were determined on polydimethylsiloxane and Innowax (polyethylene glycol) columns in a wide temperature range. The temperature dependence of the retention indices exhibits a definite minimum for the early members of the homologous series. The position of the minimum shifts to lower temperatures with increasing carbon atom number of the solute. The thermodynamic explanation of an extreme in the I vs. T function is the higher solvation heat capacities of nitroalkanes and alkanenitriles relative to those of the reference n-alkanes, owing to the deviation from the ideal state in the solution. A novel equation was derived which describes the minimum in the I vs. T function, too.",
keywords = "Alkanenitriles, Heat capacity, Nitroalkanes, Retention indices, Temperature effects, Thermodynamic parameters",
author = "M. G{\"o}rg{\'e}nyi and K. Heberger",
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doi = "10.1016/S0021-9673(02)01842-3",
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T1 - Minimum in the temperature dependence of the Kováts retention indices of nitroalkanes and alkanenitriles on an apolar phase

AU - Görgényi, M.

AU - Heberger, K.

PY - 2003/1/24

Y1 - 2003/1/24

N2 - The Kováts retention indices (I) of 1-nitroalkanes and alkanenitriles were determined on polydimethylsiloxane and Innowax (polyethylene glycol) columns in a wide temperature range. The temperature dependence of the retention indices exhibits a definite minimum for the early members of the homologous series. The position of the minimum shifts to lower temperatures with increasing carbon atom number of the solute. The thermodynamic explanation of an extreme in the I vs. T function is the higher solvation heat capacities of nitroalkanes and alkanenitriles relative to those of the reference n-alkanes, owing to the deviation from the ideal state in the solution. A novel equation was derived which describes the minimum in the I vs. T function, too.

AB - The Kováts retention indices (I) of 1-nitroalkanes and alkanenitriles were determined on polydimethylsiloxane and Innowax (polyethylene glycol) columns in a wide temperature range. The temperature dependence of the retention indices exhibits a definite minimum for the early members of the homologous series. The position of the minimum shifts to lower temperatures with increasing carbon atom number of the solute. The thermodynamic explanation of an extreme in the I vs. T function is the higher solvation heat capacities of nitroalkanes and alkanenitriles relative to those of the reference n-alkanes, owing to the deviation from the ideal state in the solution. A novel equation was derived which describes the minimum in the I vs. T function, too.

KW - Alkanenitriles

KW - Heat capacity

KW - Nitroalkanes

KW - Retention indices

KW - Temperature effects

KW - Thermodynamic parameters

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JF - Journal of Chromatography

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