Temperature dependence of the Kovats retention indices for alkyl 1, 3-diketones on a DB-5 capillary column

• Main Authors: Mijin Dušan Ž., Antonović Dušan G.
• Format: Article
• Language: English
• Published: Serbian Chemical Society 2004-01-01
• Series: Journal of the Serbian Chemical Society
• Subjects: retention indices; alkyl 1,3-diketones; temperature dependence
• Online Access: http://www.doiserbia.nb.rs/img/doi/0352-5139/2004/0352-51390410759M.pdf

A series of alkyl 1,3-diketones were used to study the temperature dependence of the Kovats retention indices in the temperature range 130–190 ºC (403–463 K). The temperature dependence is described by the empirical equation I = B B/T + ClnT. On the basis of this equation, the activation enthalpy, ΔH≠, and the chemical potential of the partitioning of one methylene group between the two phases of the chromatographic system, Δμp(CH2), were calculated. Also the Kovats retention indices – boiling point correlations (linear and reciprocal) for alkyl 1,3-diketones were studied and Δμp(CH2) was calculated.