Dialuminum
- Formula: Al2
- Molecular weight: 53.9630772
- IUPAC Standard InChI: InChI=1S/2Al
- IUPAC Standard InChIKey: QSDQMOYYLXMEPS-UHFFFAOYSA-N
- CAS Registry Number: 32752-94-6
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Constants of diatomic molecules, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | 487.02 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1979 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 233.49 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1979 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1400. | 1400. to 6000. |
|---|---|---|
| A | 44.50856 | 36.79740 |
| B | 7.132339 | 0.736635 |
| C | -15.69858 | 0.293771 |
| D | 6.284242 | -0.023379 |
| E | -0.621341 | 4.461483 |
| F | 471.4573 | 483.5867 |
| G | 282.3715 | 285.3103 |
| H | 487.0176 | 487.0176 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in June, 1979 | Data last reviewed in June, 1979 |
Constants of diatomic molecules
Go To: Top, Gas phase thermochemistry data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Klaus P. Huber and Gerhard H. Herzberg
Data collected through November, 1975
| Symbol | Meaning |
|---|---|
| State | electronic state and / or symmetry symbol |
| Te | minimum electronic energy (cm-1) |
| ωe | vibrational constant – first term (cm-1) |
| ωexe | vibrational constant – second term (cm-1) |
| ωeye | vibrational constant – third term (cm-1) |
| Be | rotational constant in equilibrium position (cm-1) |
| αe | rotational constant – first term (cm-1) |
| γe | rotation-vibration interaction constant (cm-1) |
| De | centrifugal distortion constant (cm-1) |
| βe | rotational constant – first term, centrifugal force (cm-1) |
| re | internuclear distance (Å) |
| Trans. | observed transition(s) corresponding to electronic state |
| ν00 | position of 0-0 band (units noted in table) |
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A 3Σu- | 17269.36 | 278.8 1 H | 0.831 | -0.0104 | 0.1907 | 0.0013 | 3.9E-7 | 2.560 | A → X R | 17234.05 H | ||
| ↳missing citation; missing citation | ||||||||||||
| X 3Σg- | 0 | 350.01 1 H | 2.022 | -0.0105 | 0.2054 | 0.0012 | 3.07E-7 | 2.466 | ||||
Notes
| 1 | From Zeeman, 1954 who wrongly attributed the spectrum to AlC. |
| 2 | Thermochemical value (mass spectrom.) Stearns and Kohl, 1973. Values in Blue and Gingerich, 1968, Uy and Drowart, 1971 are somewhat higher. |
References
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Zeeman, 1954
Zeeman, P.B.,
Spectrum of the AlC molecule,
Can. J. Phys., 1954, 32, 9. [all data]
Stearns and Kohl, 1973
Stearns, C.A.; Kohl, F.J.,
Mass spectrometric determination of the dissociation energies of gaseous Al2, AlSi, and AlSiO,
High Temp. Sci., 1973, 5, 113. [all data]
Blue and Gingerich, 1968
Blue; Gingerich,
16th Annual Conference on Mass Spectrometry and Allied Topics - Paper 129, Pittsburgh, 1968, 0. [all data]
Uy and Drowart, 1971
Uy, O.M.; Drowart, J.,
Determination by the mass spectrometric Knudsen cell method of the atomization energies of the gaseous aluminium chalcogenides, Al2, AlCu, AlCuS, and AlCuS2,
Trans. Faraday Soc., 1971, 67, 1293. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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