Heat Capacities of Uracil, Thymine, and Its Alkylated, Cyclooligomethylenated, and Halogenated Derivatives by Differential Calorimetry

The molar heat capacity (C p ) of solid uracil, its alkylated and halogenated derivatives, and cyclooligomethylenouracils in the temperature range of (298.15 to 343.15) K by a differential scanning calorimeter (SETARAM TG-DSC 111) were determined. It was demonstrated that the C p value increases by...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2007-01, Vol.52 (1), p.93-97
Main Authors: Zielenkiewicz, Wojciech, Kozbiał, Malgorzata, Swierzewski, Rafal, Szterner, Piotr
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Heterocyclic compounds
Heterocyclic compounds with several n hetero atoms in the same ring, in separated rings or in fused rings
Organic chemistry
Preparations and properties
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Summary:The molar heat capacity (C p ) of solid uracil, its alkylated and halogenated derivatives, and cyclooligomethylenouracils in the temperature range of (298.15 to 343.15) K by a differential scanning calorimeter (SETARAM TG-DSC 111) were determined. It was demonstrated that the C p value increases by increasing the number of methylene groups attached to the diketopyrimidine ring. The correlations C p = f(T) are given. The contributions of C−CH3, N−CH3, and C−NO2 groups as well as F, Cl, Br, and I atoms in the value of C p for the temperature of 298.15 K are presented. The Chickos method for calculation of C p values is discussed.
ISSN:0021-9568
1520-5134
DOI:10.1021/je060257y