Bromosilylidyne
- Formula: BrSi
- Molecular weight: 107.989
- IUPAC Standard InChI: InChI=1S/BrHSi/c1-2/h2H
- IUPAC Standard InChIKey: DUTDIJCKAAVQLW-UHFFFAOYSA-N
- CAS Registry Number: 14791-57-2
- 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 | 235.33 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1976 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 247.51 | 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) | 298. to 6000. |
|---|---|
| A | 38.74325 |
| B | -0.367810 |
| C | 0.160193 |
| D | 0.006464 |
| E | 0.018122 |
| F | 223.8737 |
| G | 294.6009 |
| H | 235.3253 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1976 |
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 September, 1977
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fragments of two other emission systems (30100 - 31500, 34900 - 36900 cm-1) tentatively assigned to SiBr or SiBr+. | ||||||||||||
| ↳Asundi and Karim, 1938 | ||||||||||||
| Additional absorption bands at 45762, 46266, 46343, 46693, 47445 cm-1. | ||||||||||||
| ↳Oldershaw and Robinson, 1971 | ||||||||||||
| (F) | [505] $aH | (F) ← X | 45017 H | |||||||||
| ↳Oldershaw and Robinson, 1971 | ||||||||||||
| E | (44560) | 552 H | 1.5 1 | E ← X V | (44201) )H | |||||||
| ↳Oldershaw and Robinson, 1971 | ||||||||||||
| 44521 | 552 H | 1.5 1 | E ← X V | 44585 H | ||||||||
| ↳Oldershaw and Robinson, 1971 | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| D | 44017 | [565] $bH | D ← X V | 44088 H | ||||||||
| ↳Oldershaw and Robinson, 1971 | ||||||||||||
| C (2Π) | 41060 | 531 $cH | 2.0 | C ← X V | 40690 $cH | |||||||
| ↳Oldershaw and Robinson, 1971 | ||||||||||||
| 41051 | 531 $cH | 2.0 | C ← X V | 41104 $cH | ||||||||
| ↳Oldershaw and Robinson, 1971 | ||||||||||||
| B (2Σ) | 33572.4 | 571.2 H | 2.4 | 2 3 | B ↔ X V | 33223.1 H | ||||||
| ↳missing citation; Jevons and Bashford, 1937; Kuznetsova, Kuz'menko, et al., 1968; Oldershaw and Robinson, 1971 | ||||||||||||
| 33572.4 | 571.2 H | 2.4 | 2 3 | B ↔ X V | 33645.1 H | |||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| B' (2Δ) | 23911 | 395 H | 4 | B' → X R | 23473 HQ | |||||||
| ↳Kuznetsova and Kuzyakov, 1969 | ||||||||||||
| 23889 | 395 H | 4 | B' → X R | 23874 HQ | ||||||||
| ↳Kuznetsova and Kuzyakov, 1969 | ||||||||||||
| A (2Σ) | 20937.6 | 250.3 H | 0.5 | A → X R | (20428) | |||||||
| ↳Kuznetsova and Kuzyakov, 1969; Rao and Haranath, 1969 | ||||||||||||
| 20937.6 | 250.3 H | 0.5 | A → X R | 20850.9 H | ||||||||
| ↳Kuznetsova and Kuzyakov, 1969; Rao and Haranath, 1969 | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| X 2Πr | 423.1 4 | 424.3 H | 1.5 | 3 | ||||||||
| 0 | 424.3 H | 1.5 | 3 | |||||||||
Notes
| 1 | Bands with v'=1 and 2 are diffuse. |
| 2 | Emission bands with v'>2 have not been observed. |
| 3 | Kuznetsova and Kuzyakov, 1969, 2 report the following rotational constants for the B-X bands: B'0 = 0.1771 Kuznetsova and Kuzyakov, 1969, 2, B"0(2Π1/2) = 0.1598 Kuznetsova and Kuzyakov, 1969, 2. See also Mishra and Khanna, 1972 who give considerably different results. |
| 4 | From Kuznetsova, Kuz'menko, et al., 1968; Jevons and Bashford, 1937 prefer a doublet separation of 418.0 cm-1 leading to slightly different constants. |
| 5 | Only two bands; it is not certain that they belong to the same system. |
| 6 | It is possible that the v'=1 progression is in fact a separate system D' ← X. |
| 7 | Vibrational numbering uncertain. |
| 8 | Br isotope shifts clearly observed. |
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]
Asundi and Karim, 1938
Asundi, R.K.; Karim, S.M.,
On the emission spectrum of SiBr4,
Proc. Indian Acad. Sci. Sect. A, 1938, 6, 281. [all data]
Oldershaw and Robinson, 1971
Oldershaw, G.A.; Robinson, K.,
Ultra-violet spectrum of SiBr,
Trans. Faraday Soc., 1971, 67, 1870. [all data]
Jevons and Bashford, 1937
Jevons, W.; Bashford, L.A.,
Ultra-violet band systems of SnBr and SiBr,
Proc. Phys. Soc. London, 1937, 49, 554. [all data]
Kuznetsova, Kuz'menko, et al., 1968
Kuznetsova, L.A.; Kuz'menko, N.E.; Kuzyakov, Yu.Ya.,
Analysis of the vibrational structure of the SiBr emission spectrum,
Moscow Univ. Chem. Bull. Engl. Transl., 1968, 23, 18, In original 30. [all data]
Kuznetsova and Kuzyakov, 1969
Kuznetsova, L.A.; Kuzyakov, Yu.Ya.,
Emission spectrum of a glow discharge in SiBr4 vapor,
J. Appl. Spectrosc. Engl. Transl., 1969, 10, 278, In original 413. [all data]
Rao and Haranath, 1969
Rao, K.B.; Haranath, P.B.V.,
The emission band spectrum of SiBr in the visible region,
J. Phys. B:, 1969, 2, 1381. [all data]
Kuznetsova and Kuzyakov, 1969, 2
Kuznetsova, L.A.; Kuzyakov, Yu.Ya.,
Rotational analysis of the 2Σ-2Π band system of the spectrum of the SiBr molecule,
Moscow Univ. Chem. Bull. Engl. Transl., 1969, 24, 74, In original 103. [all data]
Mishra and Khanna, 1972
Mishra, R.K.; Khanna, B.N.,
Emission spectrum of the SiBr molecule,
Indian J. Phys., 1972, 46, 1. [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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