No abstract

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.

No abstract