1H-Benzimidazole
- Formula: C7H6N2
- Molecular weight: 118.1359
- IUPAC Standard InChI: InChI=1S/C7H6N2/c1-2-4-7-6(3-1)8-5-9-7/h1-5H,(H,8,9)
- IUPAC Standard InChIKey: HYZJCKYKOHLVJF-UHFFFAOYSA-N
- CAS Registry Number: 51-17-2
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Benzimidazole; o-Benzimidazole; Azindole; Benziminazole; Benzoglyoxaline; Benzoimidazole; BZI; N,N'-Methenyl-o-phenylenediamine; 1,3-Benzodiazole; 1,3-Diazaindene; 3-Azaindole; NSC 759
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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 as indicated in comments:
AC - William E. Acree, Jr., James S. Chickos
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 101. ± 7. | kJ/mol | AVG | N/A | Average of 6 values; Individual data points |
Enthalpy of sublimation
| ΔsubH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 90.2 ± 0.6 | 363. | C | Lehman, Gentry, et al., 1998 | AC |
| 101.8 ± 0.4 | 350. | ME | Jimenez, Roux, et al., 1987 | Based on data from 340. to 359. K.; AC |
Enthalpy of fusion
| ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 20.47 | 445.5 | Domanska, Kozlowska, et al., 2002 | AC |
| 19.25 | 443.2 | Pitzer, Peiper, et al., 1984 | AC |
References
Go To: Top, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Lehman, Gentry, et al., 1998
Lehman, Richard L.; Gentry, Jefffery S.; Glumac, Nick G.,
Thermal stability of potassium carbonate near its melting point,
Thermochimica Acta, 1998, 316, 1, 1-9, https://doi.org/10.1016/S0040-6031(98)00289-5
. [all data]
Jimenez, Roux, et al., 1987
Jimenez, P.; Roux, M.V.; Turrion, C.,
Thermochemical properties of N-heterocyclic compounds. I. Enthalpies of combustion, vapour pressures and enthalpies of sublimation, and enthalpies of formation of pyrazole, imidazole, indazole, and benzimidazole,
J. Chem. Thermodyn., 1987, 19, 985-992. [all data]
Domanska, Kozlowska, et al., 2002
Domanska, Urszula; Kozlowska, Marta Karolina; Rogalski, Marek,
Solubilities, Partition Coefficients, Density, and Surface Tension for Imidazoles + Octan-1-ol or + Water or + n -Decane «8224»,
J. Chem. Eng. Data, 2002, 47, 3, 456-466, https://doi.org/10.1021/je0103014
. [all data]
Pitzer, Peiper, et al., 1984
Pitzer, Kenneth S.; Peiper, J. Christopher; Busey, R.H.,
Thermodynamic Properties of Aqueous Sodium Chloride Solutions,
J. Phys. Chem. Ref. Data, 1984, 13, 1, 1, https://doi.org/10.1063/1.555709
. [all data]
Notes
Go To: Top, Phase change data, References
- Symbols used in this document:
ΔfusH Enthalpy of fusion ΔsubH Enthalpy of sublimation ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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