silicon tetrabromide
- Formula: Br4Si
- Molecular weight: 347.702
- IUPAC Standard InChIKey: AIFMYMZGQVTROK-UHFFFAOYSA-N
- CAS Registry Number: 7789-66-4
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, 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 | -415.47 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1976 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 379.33 | J/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1976 |
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) | 800. to 6000. |
---|---|
A | 107.0117 |
B | 0.917258 |
C | -0.248429 |
D | 0.021195 |
E | -0.927672 |
F | -450.5248 |
G | 503.3478 |
H | -415.4716 |
Reference | Chase, 1998 |
Comment | Data last reviewed in December, 1976 |
Condensed phase thermochemistry 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.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°liquid | -457.31 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1976 |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid,1 bar | 278.24 | J/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1976 |
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) | 298. to 800. |
---|---|
A | 146.4400 |
B | 0.000000 |
C | 0.000000 |
D | 0.000000 |
E | 0.000000 |
F | -500.9712 |
G | 455.4535 |
H | -457.3112 |
Reference | Chase, 1998 |
Comment | Data last reviewed in December, 1976 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Vibrational and/or electronic energy levels, 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:
LL - Sharon G. Lias and Joel F. Liebman
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
10.62 ± 0.04 | PI | Creasey, Lambert, et al., 1991 | LL |
14. ± 1. | EI | Farber and Srivastava, 1980 | LLK |
10.8 | PE | Green, Green, et al., 1970 | RDSH |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
Br+ | 25.0 ± 0.5 | ? | PI | Creasey, Lambert, et al., 1991 | LL |
BrSi+ | 17.1 ± 0.3 | ? | PI | Creasey, Lambert, et al., 1991 | LL |
Br2Si+ | 16.1 ± 0.3 | ? | PI | Creasey, Lambert, et al., 1991 | LL |
Br3Si+ | 11.31 ± 0.03 | Br | PI | Creasey, Lambert, et al., 1991 | LL |
Si+ | 23.4 ± 0.4 | ? | PI | Creasey, Lambert, et al., 1991 | LL |
Vibrational and/or electronic energy levels
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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: Takehiko Shimanouchi
Symmetry: Td Symmetry Number σ = 12
Sym. | No | Approximate | Selected Freq. | Infrared | Raman | Comments | ||||
---|---|---|---|---|---|---|---|---|---|---|
Species | type of mode | Value | Rating | Value | Phase | Value | Phase | |||
a1 | 1 | Sym str | 249 | C | ia | 249 p | liq. | |||
e | 2 | Deg deform | 90 | C | ia | 90 | liq. | |||
f2 | 3 | Deg str | 487 | C | 487 | liq. | ||||
f2 | 4 | Deg deform | 137 | C | 137 | liq. | ||||
Source: Shimanouchi, 1972
Notes
ia | Inactive |
p | Polarized |
C | 3~6 cm-1 uncertainty |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, 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]
Creasey, Lambert, et al., 1991
Creasey, J.C.; Lambert, I.R.; Tuckett, R.P.; Codling, K.; Leszek, J.F.; Hatherly, P.A.; Stankiewicz, M.,
Photoionization mass-spectrometric study of fragmentation of SiBr4 and GeBr4 in the range 400-1220 A,
J. Chem. Soc. Faraday Trans., 1991, 87, 3717. [all data]
Farber and Srivastava, 1980
Farber, M.; Srivastava, R.D.,
Mass spectrometric determination of the heats of formation of the silicon bromides SiBr(g), SiBr2(g), and SiBr3(g).,
High Temp. Sci., 1980, 12, 21. [all data]
Green, Green, et al., 1970
Green, J.C.; Green, M.L.H.; Joachim, P.J.; Orchard, A.F.; Turner, D.W.,
A study of the bonding in the group IV tetrahalides by photoelectron spectroscopy,
Phil. Trans. Roy. Soc. (London), 1970, A268, III. [all data]
Shimanouchi, 1972
Shimanouchi, T.,
Tables of Molecular Vibrational Frequencies Consolidated Volume I, National Bureau of Standards, 1972, 1-160. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, References
- Symbols used in this document:
AE Appearance energy S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid 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 - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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