boron
- Formula: B
- Molecular weight: 10.811
- IUPAC Standard InChIKey: ZOXJGFHDIHLPTG-UHFFFAOYSA-N
- CAS Registry Number: 7440-42-8
- Chemical structure:
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- Information on this page:
- Other data available:
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- Electron-Impact Ionization Cross Sections (on physics web site)
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Reaction thermochemistry 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 | 565. ± 5. | kJ/mol | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
ΔfH°gas | 560.00 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1983 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 153.436 ± 0.015 | J/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
S°gas,1 bar | 153.44 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1983 |
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) | 4137.895 to 6000. |
---|---|
A | 20.65193 |
B | 0.226427 |
C | -0.112330 |
D | 0.016889 |
E | 0.008714 |
F | 553.8654 |
G | 178.4179 |
H | 559.9991 |
Reference | Chase, 1998 |
Comment | Data last reviewed in June, 1983 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry 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°liquid | 48.93 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1983 |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid,1 bar | 26.54 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1983 |
Quantity | Value | Units | Method | Reference | Comment |
S°solid,1 bar | 5.90 ± 0.08 | J/mol*K | Review | Cox, Wagman, et al., 1984 | rhombic phase; CODATA Review value |
Liquid 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) | 2350. to 4137.895 |
---|---|
A | 31.75003 |
B | 2.556177×10-7 |
C | -6.456792×10-8 |
D | 5.616644×10-9 |
E | 2.705970×10-7 |
F | 27.94205 |
G | 46.94741 |
H | 48.92686 |
Reference | Chase, 1998 |
Comment | Data last reviewed in June, 1983 |
Solid 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 1800. | 1800. to 2350. |
---|---|---|
A | 10.18574 | 25.12664 |
B | 29.24415 | 1.975493 |
C | -18.02137 | 0.338395 |
D | 4.212326 | -0.040032 |
E | -0.550999 | -2.635578 |
F | -6.036299 | -14.43597 |
G | 7.089077 | 25.59930 |
H | 0.000000 | 0.000000 |
Reference | Chase, 1998 | Chase, 1998 |
Comment | β-rhombohedral phase; Data last reviewed in June, 1983 | β-rhombohedral phase; Data last reviewed in June, 1983 |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Condensed 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 as indicated in comments:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
B - John E. Bartmess
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
By formula: (B+ • 10B) + B = (B+ • 11B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 531. ± 50. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • 11B) + B = (B+ • 12B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 770. ± 150. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • 9B) + B = (B+ • 10B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 540. ± 75. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • 2B) + B = (B+ • 3B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 770. ± 150. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • 3B) + B = (B+ • 4B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 686. ± 59. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • 5B) + B = (B+ • 6B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 531. ± 67. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • 8B) + B = (B+ • 9B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 523. ± 50. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • 4B) + B = (B+ • 5B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 260. ± 59. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • 6B) + B = (B+ • 7B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 410. ± 50. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • 7B) + B = (B+ • 8B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 380. ± 50. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
By formula: (B+ • B) + B = (B+ • 2B)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 410. ± 67. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
(CAS Reg. No. 12513-02-9 • 4294967295) +
= CAS Reg. No. 12513-02-9
By formula: (CAS Reg. No. 12513-02-9 • 4294967295B) + B = CAS Reg. No. 12513-02-9
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 905. ± 12. | kJ/mol | N/A | Wenthold, Kim, et al., 1997 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 75. ± 59. | kJ/mol | CID | Hanley, Whitten, et al., 1988 | gas phase; ΔrH<; M |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A.,
CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Hanley, Whitten, et al., 1988
Hanley, L.; Whitten, J.L.; Anderson, S.L.,
Collision - Induced Dissociation and ab initio Studies of Boron Cluster Ions. Determination of Structures and Stabilities,
J. Phys. Chem., 1988, 92, 20, 5803, https://doi.org/10.1021/j100331a052
. [all data]
Wenthold, Kim, et al., 1997
Wenthold, P.G.; Kim, J.B.; Jonas, K.-L.; Lineberger, W.C.,
An Experimental and Computational Study of the Electron Affinity of Boron Oxide,
J. Phys. Chem. A, 1997, 101, 24, 4472, https://doi.org/10.1021/jp970645u
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid,1 bar Entropy of solid at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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