Low-temperature heat capacity of L- and DL-phenylglycines
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 Cp(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 r...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Paukov, I. E. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2010 |
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| Schlagwörter: |
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| Anmerkung: |
© Akadémiai Kiadó, Budapest, Hungary 2010 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of thermal analysis and calorimetry - Springer Netherlands, 1998, 108(2010), 3 vom: 03. Nov., Seite 1311-1316 |
|---|---|
| Übergeordnetes Werk: |
volume:108 ; year:2010 ; number:3 ; day:03 ; month:11 ; pages:1311-1316 |
| Links: |
|---|
| DOI / URN: |
10.1007/s10973-009-0665-4 |
|---|
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OLC2049811993 |
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| 520 | |a 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 Cp(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 Cp(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 Cp(T) at very low temperatures does not follow the Debye law C – T3. The heat capacity Cp(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. | ||
| 650 | 4 | |a Adiabatic calorimetry | |
| 650 | 4 | |a L-phenylglycine | |
| 650 | 4 | |a DL-phenylglycine | |
| 650 | 4 | |a Heat capacity | |
| 650 | 4 | |a Molecular crystals | |
| 650 | 4 | |a Chiral/racemic counterparts | |
| 700 | 1 | |a Kovalevskaya, Yulia A. |4 aut | |
| 700 | 1 | |a Boldyreva, Elena V. |4 aut | |
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10.1007/s10973-009-0665-4 doi (DE-627)OLC2049811993 (DE-He213)s10973-009-0665-4-p DE-627 ger DE-627 rakwb eng 660 VZ Paukov, I. E. verfasserin aut Low-temperature heat capacity of L- and DL-phenylglycines 2010 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Akadémiai Kiadó, Budapest, Hungary 2010 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 Cp(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 Cp(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 Cp(T) at very low temperatures does not follow the Debye law C – T3. The heat capacity Cp(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. Adiabatic calorimetry L-phenylglycine DL-phenylglycine Heat capacity Molecular crystals Chiral/racemic counterparts Kovalevskaya, Yulia A. aut Boldyreva, Elena V. aut Enthalten in Journal of thermal analysis and calorimetry Springer Netherlands, 1998 108(2010), 3 vom: 03. Nov., Seite 1311-1316 (DE-627)244148767 (DE-600)1429493-X (DE-576)066397693 1388-6150 nnns volume:108 year:2010 number:3 day:03 month:11 pages:1311-1316 https://doi.org/10.1007/s10973-009-0665-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_70 AR 108 2010 3 03 11 1311-1316 |
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10.1007/s10973-009-0665-4 doi (DE-627)OLC2049811993 (DE-He213)s10973-009-0665-4-p DE-627 ger DE-627 rakwb eng 660 VZ Paukov, I. E. verfasserin aut Low-temperature heat capacity of L- and DL-phenylglycines 2010 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Akadémiai Kiadó, Budapest, Hungary 2010 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 Cp(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 Cp(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 Cp(T) at very low temperatures does not follow the Debye law C – T3. The heat capacity Cp(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. Adiabatic calorimetry L-phenylglycine DL-phenylglycine Heat capacity Molecular crystals Chiral/racemic counterparts Kovalevskaya, Yulia A. aut Boldyreva, Elena V. aut Enthalten in Journal of thermal analysis and calorimetry Springer Netherlands, 1998 108(2010), 3 vom: 03. Nov., Seite 1311-1316 (DE-627)244148767 (DE-600)1429493-X (DE-576)066397693 1388-6150 nnns volume:108 year:2010 number:3 day:03 month:11 pages:1311-1316 https://doi.org/10.1007/s10973-009-0665-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_70 AR 108 2010 3 03 11 1311-1316 |
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10.1007/s10973-009-0665-4 doi (DE-627)OLC2049811993 (DE-He213)s10973-009-0665-4-p DE-627 ger DE-627 rakwb eng 660 VZ Paukov, I. E. verfasserin aut Low-temperature heat capacity of L- and DL-phenylglycines 2010 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Akadémiai Kiadó, Budapest, Hungary 2010 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 Cp(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 Cp(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 Cp(T) at very low temperatures does not follow the Debye law C – T3. The heat capacity Cp(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. Adiabatic calorimetry L-phenylglycine DL-phenylglycine Heat capacity Molecular crystals Chiral/racemic counterparts Kovalevskaya, Yulia A. aut Boldyreva, Elena V. aut Enthalten in Journal of thermal analysis and calorimetry Springer Netherlands, 1998 108(2010), 3 vom: 03. Nov., Seite 1311-1316 (DE-627)244148767 (DE-600)1429493-X (DE-576)066397693 1388-6150 nnns volume:108 year:2010 number:3 day:03 month:11 pages:1311-1316 https://doi.org/10.1007/s10973-009-0665-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_70 AR 108 2010 3 03 11 1311-1316 |
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10.1007/s10973-009-0665-4 doi (DE-627)OLC2049811993 (DE-He213)s10973-009-0665-4-p DE-627 ger DE-627 rakwb eng 660 VZ Paukov, I. E. verfasserin aut Low-temperature heat capacity of L- and DL-phenylglycines 2010 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Akadémiai Kiadó, Budapest, Hungary 2010 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 Cp(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 Cp(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 Cp(T) at very low temperatures does not follow the Debye law C – T3. The heat capacity Cp(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. Adiabatic calorimetry L-phenylglycine DL-phenylglycine Heat capacity Molecular crystals Chiral/racemic counterparts Kovalevskaya, Yulia A. aut Boldyreva, Elena V. aut Enthalten in Journal of thermal analysis and calorimetry Springer Netherlands, 1998 108(2010), 3 vom: 03. Nov., Seite 1311-1316 (DE-627)244148767 (DE-600)1429493-X (DE-576)066397693 1388-6150 nnns volume:108 year:2010 number:3 day:03 month:11 pages:1311-1316 https://doi.org/10.1007/s10973-009-0665-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_70 AR 108 2010 3 03 11 1311-1316 |
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10.1007/s10973-009-0665-4 doi (DE-627)OLC2049811993 (DE-He213)s10973-009-0665-4-p DE-627 ger DE-627 rakwb eng 660 VZ Paukov, I. E. verfasserin aut Low-temperature heat capacity of L- and DL-phenylglycines 2010 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Akadémiai Kiadó, Budapest, Hungary 2010 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 Cp(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 Cp(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 Cp(T) at very low temperatures does not follow the Debye law C – T3. The heat capacity Cp(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. Adiabatic calorimetry L-phenylglycine DL-phenylglycine Heat capacity Molecular crystals Chiral/racemic counterparts Kovalevskaya, Yulia A. aut Boldyreva, Elena V. aut Enthalten in Journal of thermal analysis and calorimetry Springer Netherlands, 1998 108(2010), 3 vom: 03. Nov., Seite 1311-1316 (DE-627)244148767 (DE-600)1429493-X (DE-576)066397693 1388-6150 nnns volume:108 year:2010 number:3 day:03 month:11 pages:1311-1316 https://doi.org/10.1007/s10973-009-0665-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_70 AR 108 2010 3 03 11 1311-1316 |
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660 VZ Low-temperature heat capacity of L- and DL-phenylglycines Adiabatic calorimetry L-phenylglycine DL-phenylglycine Heat capacity Molecular crystals Chiral/racemic counterparts |
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ddc 660 misc Adiabatic calorimetry misc L-phenylglycine misc DL-phenylglycine misc Heat capacity misc Molecular crystals misc Chiral/racemic counterparts |
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ddc 660 misc Adiabatic calorimetry misc L-phenylglycine misc DL-phenylglycine misc Heat capacity misc Molecular crystals misc Chiral/racemic counterparts |
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ddc 660 misc Adiabatic calorimetry misc L-phenylglycine misc DL-phenylglycine misc Heat capacity misc Molecular crystals misc Chiral/racemic counterparts |
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Low-temperature heat capacity of L- and DL-phenylglycines |
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Low-temperature heat capacity of L- and DL-phenylglycines |
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Paukov, I. E. |
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Journal of thermal analysis and calorimetry |
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Journal of thermal analysis and calorimetry |
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2010 |
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Paukov, I. E. Kovalevskaya, Yulia A. Boldyreva, Elena V. |
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10.1007/s10973-009-0665-4 |
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660 |
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low-temperature heat capacity of l- and dl-phenylglycines |
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Low-temperature heat capacity of L- and DL-phenylglycines |
| abstract |
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 Cp(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 Cp(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 Cp(T) at very low temperatures does not follow the Debye law C – T3. The heat capacity Cp(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. © Akadémiai Kiadó, Budapest, Hungary 2010 |
| abstractGer |
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 Cp(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 Cp(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 Cp(T) at very low temperatures does not follow the Debye law C – T3. The heat capacity Cp(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. © Akadémiai Kiadó, Budapest, Hungary 2010 |
| abstract_unstemmed |
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 Cp(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 Cp(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 Cp(T) at very low temperatures does not follow the Debye law C – T3. The heat capacity Cp(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. © Akadémiai Kiadó, Budapest, Hungary 2010 |
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Low-temperature heat capacity of L- and DL-phenylglycines |
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