Dibromosilylene
- Formula: Br2Si
- Molecular weight: 187.893
- IUPAC Standard InChI: InChI=1S/Br2Si/c1-3-2
- IUPAC Standard InChIKey: KBDJQNUZLNUGDS-UHFFFAOYSA-N
- CAS Registry Number: 14877-32-8
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, 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 | -52.30 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1977 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 305.19 | J/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1977 |
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 6000. |
|---|---|
| A | 58.22705 |
| B | -0.113451 |
| C | -0.029235 |
| D | 0.029778 |
| E | -0.414550 |
| F | -71.04725 |
| G | 373.3580 |
| H | -52.30000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1977 |
Vibrational and/or electronic energy levels
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: Marilyn E. Jacox
State: A ?
| Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
|---|---|---|---|---|---|---|---|
| Tx = 27600 | gas | A-X | 340 | 400 | Ruzsicska, Jodhan, et al., 1987 | ||
State: X
| Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
|---|---|---|---|---|---|---|---|
| a1 | 1 | Sym. stretch | 402.6 | s | Ar | IR | Maass, Hauge, et al., 1972 |
| b2 | 3 | Asym. stretch | 399.5 | vs | Ar | IR | Maass, Hauge, et al., 1972 |
Additional references: Jacox, 1994, page 101
Notes
| s | Strong |
| vs | Very strong |
| x | Energy separation between the band maximum of the excited electronic state and the v = 0 level of the ground state. |
References
Go To: Top, Gas phase thermochemistry 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]
Ruzsicska, Jodhan, et al., 1987
Ruzsicska, B.; Jodhan, A.; Safarik, I.; Strausz, O.P.; Bell, T.N.,
Flash photolysis of SiBr4: the UV spectrum of SiBr2,
Chem. Phys. Lett., 1987, 139, 1, 72, https://doi.org/10.1016/0009-2614(87)80153-7
. [all data]
Maass, Hauge, et al., 1972
Maass, G.; Hauge, R.H.; Margrave, J.L.,
The I.R. Spectra of Matrix-isolated SiBr2 and SiCl2,
Z. Anorg. Allg. Chem., 1972, 392, 3, 295, https://doi.org/10.1002/zaac.19723920314
. [all data]
Jacox, 1994
Jacox, M.E.,
Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Vibrational and/or electronic energy levels, 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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