Heat capacity of Delta b-alanine in a temperature range between 6 and 300 K

Thermodynamic properties of Delta *b-alanine in the temperature range 6.3--301 K were studied. No phase transitions were observed for the sample specially prepared to contain no solvent inclusions. At 298.15 K the calorimetric entropy and the difference in the enthalpy values are equal, respectively, to 126.6 JK mol and 19.220 Jmol. The C p (T) in the temperature range 6--16 K can be well described by Debye equation C p = AT . A comparison of the data on the entropies of glycine polymorphs and of Delta *b-alanine was used to show, that the empirical Parks--Huffman rule holds in the case of these compounds.