Thermal Data. V. The Heat Capacities, Entropies and Free Energies of Adenine, Hypoxanthine, Guanine, Xanthine, Uric Acid, Allantoin and Alloxan

Saturation molalities and standard molar enthalpies of solution of cytidine(cr), hypoxanthine(cr), thymidine(cr), thymine(cr), uridine(cr), and xanthine(cr) in H2O(l)

“…Values of the standard molar entropy S m {based on standard molar heat capacities (85 6 T =K 6 298:5 K)} and the standard molar enthalpy of combustion D c H m in O 2 (g) have been determined for hypoxanthine(cr) and for xanthine(cr) by Stiehler and Huffman [47,48]. We have used their [47,48] values of S m and of D c H m (as recalculated by Domalski [49]) together with our results for D sol G m and D sol H m for hypoxanthine(cr) and xanthine(cr) (see table 7) to calculate the standard molar formation properties of these substances that are given in table 9.…”

Enthalpies of Solution of the Nucleic Acid Bases. 6. Guanine in Aqueous HCl and NaOH, and Guanine Hydrochlorides in Aqueous HCl

“…Stiehler and Huffman measured the heat of combustion [7], and the heat capacity [19] from which they calculated the entropy and free energy. The enthalpy of sublimation was measured by Yanson and Teplit- E~~~.…”

Biomolecules in hydrothermal systems: Calculation of the standard molal thermodynamic properties of nucleic-acid bases, nucleosides, and nucleotides at elevated temperatures and pressures

“…h Domalski and Hearing (1996). i Calculated by regressing experimental C P data from Stiehler and Huffman (1935b) with Eq. (6).…”

“…3 and 4 represent experimental values of standard molal isobaric crystalline heat capacities ðC P ðcrÞ Þ reported in the literature for adenine, Standard molal heat capacities ðC P Þ of crystalline adenine and guanine as a function of temperature at 1 bar. The symbols denote values of C P taken fromStiehler and Huffman (1935b). The regression lines represent fits of Eq.…”