Mercury bromide
- Formula: BrHg
- Molecular weight: 280.49
- IUPAC Standard InChI: InChI=1S/BrH.Hg/h1H;/q;+1/p-1
- IUPAC Standard InChIKey: RSBFLMXMTDFOBK-UHFFFAOYSA-M
- CAS Registry Number: 10031-18-2
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Constants of diatomic molecules, NIST Free Links, 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 | 24.900 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1961 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 64.900 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1961 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. - 6000. |
|---|---|
| A | 8.940220 |
| B | 0.272397 |
| C | -0.000507 |
| D | 0.000043 |
| E | -0.011415 |
| F | 22.18420 |
| G | 75.57271 |
| H | 24.90010 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1961 |
Constants of diatomic molecules
Go To: Top, Gas phase thermochemistry data, NIST Free Links, 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 January, 1975
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| E | (40720) | (166) | (1.1) | E → X 1 | (40710) | |||||||
| ↳Rao and Rao, 1944 | ||||||||||||
| D 2Π3/2 | 38574.4 | 228.5 2 H | 0.950 | D ↔ X V | 38595.5 H | |||||||
| ↳Wieland, 1929; missing citation; missing citation | ||||||||||||
| C (2Π1/2) | 34722.0 | 278.6 3 H | 1.82 | C ↔ X V | 34767.5 3 H | |||||||
| ↳Wieland, 1929; Wieland, 1932; Howell, 1944; Wieland, 1948; missing citation; missing citation | ||||||||||||
| B 2Σ+ | 23485.0 | 135.075 H | 0.275 | B ↔ X R | 23459.5 H | |||||||
| ↳Wieland, 1939; Wieland, 1948, 2; missing citation | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| X 2Σ+ | 0 | 186.47 H | 0.9665 | -0.0090 | ||||||||
| ↳Wieland, 1960 | ||||||||||||
Notes
| 1 | Headless diffuse bands. |
| 2 | Constants for 202Hg81Br. |
| 3 | From Patel and Darji, 1968, Greig, Gunning, et al., 1970. Earlier analyses of C-X by Sastry, 1941, Sastry, 1941, 2 and Krishnamurthy, 1958 as well as the suggested existence of an additional system in the region 36100 - 37000 cm-1 Krishnamurthy, 1958, Patel and Darji, 1968 are not convincing. |
References
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, NIST Free Links, 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]
Rao and Rao, 1944
Rao, K.R.; Rao, G.V.S.R.,
A new band system of the HgBr molecule,
Indian J. Phys., 1944, 18, 281. [all data]
Wieland, 1929
Wieland, K.,
Bandenspektren der quecksilber-, cadmium- und zinkhalogenide,
Helv. Phys. Acta, 1929, 2, 46. [all data]
Wieland, 1932
Wieland, K.,
Absorptions- und fluoreszenzspektren dampfformiger quecksilberhalogenide. II. HgBr2 und HgCl2,
Z. Phys., 1932, 77, 157. [all data]
Howell, 1944
Howell, H.G.,
The ultra-violet spectra and electron configuration of HgF and related halide molecules,
Proc. R. Soc. London A, 1944, 182, 95. [all data]
Wieland, 1948
Wieland, K.,
Spectres d'absorption des halogenures de mercure (HgX2) en equilibre thermique au-dessus de 1000°C,
J. Chim. Phys. Phys.-Chim. Biol., 1948, 45, 3. [all data]
Wieland, 1939
Wieland, K.,
Vereinfachung des fluoreszenzspektrums von HgBr durch fremdgas-zusatz,
Helv. Phys. Acta, 1939, 12, 295. [all data]
Wieland, 1948, 2
Wieland, K.,
Molekulspektren mit Ionencharakter und ihre Beeinflussung durch Fremdgase
in Contribution a l'Etude de la Structure Moleculaire, Desoer, Liege, ed(s)., 1948, 229-238. [all data]
Wieland, 1960
Wieland, K.,
Bandensysteme B(2Σ+) → X(2Σ+) und Dissoziationswerte der Radikale HgJ und HgBr,
Z. Elektrochem., 1960, 64, 761. [all data]
Patel and Darji, 1968
Patel, M.M.; Darji, A.B.,
Band spectrum of mercury bromide in the ultraviolet region,
Indian J. Phys., 1968, 42, 110. [all data]
Greig, Gunning, et al., 1970
Greig, G.; Gunning, H.E.; Strausz, O.P.,
Reactions of metal atoms. II. The combination of mercury and bromine atoms and the dimerization of HgBr,
J. Chem. Phys., 1970, 52, 3684. [all data]
Sastry, 1941
Sastry, M.G.,
Ultra violet band spectrum of HgBr,
Curr. Sci., 1941, 10, 197. [all data]
Sastry, 1941, 2
Sastry, M.G.,
The ultra-violet band spectrum of mercury bromide,
Proc. Natl. Inst. Sci. India, 1941, 7, 359. [all data]
Krishnamurthy, 1958
Krishnamurthy, V.G.,
Ultraviolet bands of mercury bromide,
Z. Phys., 1958, 152, 242. [all data]
Notes
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- 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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