Abstract
Heat capacity of crystalline L- and DL-phenylglycines was measured in the temperature range from 6 to 305 K. For L-phenylglycine, no anomalies in the C p (T) dependence were observed. For DL-phenylglycine, however, an anomaly in the temperature range 50–75 K with a maximum at about 60 K was registered. The enthalpy and the entropy changes corresponding to this anomaly were estimated as 20 J mol−1 and 0.33 J K−1 mol−1, respectively. In the temperature range 205–225 K, an unusually large dispersion of the experimental points and a small change in the slope of the C p (T) curve were noticed. Thermodynamic functions for L- and DL-phenylglycines in the temperature range 0–305 K were calculated. At 298.15 K, the values of heat capacity, entropy, and enthalpy are equal to 179.1, 195.3 J K−1 mol−1, and 28590 J mol−1 for L-phenylglycine and 177.7, 196.3 J K−1 mol−1 and 28570 J mol−1 for DL-phenylglycine. For both L- and DL-phenylglycine, the C p (T) at very low temperatures does not follow the Debye law C – T 3. The heat capacity C p (T) is slightly higher for L-phenylglycine, than for the racemic DL-crystal, with the exception of the phase transition region. The difference is smaller than was observed previously for the L-/DL-cysteines, and considerably smaller, than that for L-/DL- serines.
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Acknowledgements
The study was supported by an Interdisciplinary Integration Project of the SB RAS No. 109, as well as by grants from RFBR (09-03-00451-a) and BRHE (NO-008-XI and RUX0-008-NO-06/BP4M08).
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Paukov, I.E., Kovalevskaya, Y.A. & Boldyreva, E.V. Low-temperature heat capacity of L- and DL-phenylglycines. J Therm Anal Calorim 108, 1311–1316 (2012). https://doi.org/10.1007/s10973-009-0665-4
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DOI: https://doi.org/10.1007/s10973-009-0665-4