Boron
- Formula: B2
- Molecular weight: 21.622
- IUPAC Standard InChI: InChI=1S/B2/c1-2
- IUPAC Standard InChIKey: ZOCHARZZJNPSEU-UHFFFAOYSA-N
- CAS Registry Number: 14452-61-0
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Gas phase ion energetics data, 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 | 829.69 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1979 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 202.07 | J/mol*K | Review | Chase, 1998 | Data last reviewed in March, 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 800. | 800. to 6000. |
|---|---|---|
| A | -5.565682 | 43.33243 |
| B | 150.5307 | -3.618461 |
| C | -170.6670 | 0.949371 |
| D | 66.18586 | -0.067489 |
| E | 0.506419 | -0.352579 |
| F | 827.7333 | 814.3738 |
| G | 160.3058 | 250.2693 |
| H | 829.6872 | 829.6872 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in March, 1979 | Data last reviewed in March, 1979 |
Gas phase ion energetics data
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: John E. Bartmess
View reactions leading to B2+ (ion structure unspecified)
Electron affinity determinations
| EA (eV) | Reference | Comment |
|---|---|---|
| >1.30 ± 0.40 | Reid, 1993 | EA "probably 41.5 kcal/mol. |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, 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]
Reid, 1993
Reid, C.J.,
Electron Affinities of BH, B2, BC, and BN molecules determined using Charge Inversion Spectrometry,
Int. J. Mass Spectrom. Ion Proc., 1993, 127, 147, https://doi.org/10.1016/0168-1176(93)87087-9
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
EA Electron affinity 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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