Ammonium hydrogen oxalate hemihydrate
- Formula: C4H10N2O8·H2O
- Molecular weight: 232.1461
- IUPAC Standard InChI: InChI=1S/2C2H2O4.2H3N.H2O/c2*3-1(4)2(5)6;;;/h2*(H,3,4)(H,5,6);2*1H3;1H2
- IUPAC Standard InChIKey: LRFVZPMSSZVHGG-UHFFFAOYSA-N
- CAS Registry Number: 37541-72-3
- Chemical structure:
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Phase change data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing
Enthalpy of phase transition
| ΔHtrs (kJ/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 0.730 | 145.4 | crystaline, II | crystaline, I | Fukai, Matsuo, et al., 1990 | |
| 0.00037 | 145.4 | crystaline, II | crystaline, I | Fukai, Matsuo, et al., 1989 | |
| 0.00037 | 145.4 | crystaline, II | crystaline, I | Fukai, Matsuo, et al., 1989 |
Entropy of phase transition
| ΔStrs (J/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 6.01 | 145.4 | crystaline, II | crystaline, I | Fukai, Matsuo, et al., 1990 | |
| 3.01 | 145.4 | crystaline, II, Order | crystaline, I, disorder transition | Fukai, Matsuo, et al., 1989 | |
| 3.01 | 145.4 | crystaline, II, Order | crystaline, I, disorder transition | Fukai, Matsuo, et al., 1989 |
References
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Fukai, Matsuo, et al., 1990
Fukai, M.; Matsuo, T.; Suga, H.,
Low temperature heat capacities of ammonium hydrogen oxalate hemihydrate and its deuterate analogue,
Ferroelectrics, 1990, 108, 367-372. [all data]
Fukai, Matsuo, et al., 1989
Fukai, M.; Matsuo, T.; Suga, H.,
Calorimetric study of phase transitions in ammonium hydrogen oxalate hemihydrate and its deuterated compound,
J. Phys. Chem. Solids, 1989, 50, 743-751. [all data]
Notes
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- Symbols used in this document:
ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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