Mercury diiodide
- Formula: HgI2
- Molecular weight: 454.40
- IUPAC Standard InChI: InChI=1S/Hg.2HI/h;2*1H/q+2;;/p-2
- IUPAC Standard InChIKey: YFDLHELOZYVNJE-UHFFFAOYSA-L
- CAS Registry Number: 7774-29-0
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics 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 | -3.855 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1962 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 80.356 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1962 |
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) | 1500. to 6000. |
|---|---|
| A | 14.89790 |
| B | 0.005199 |
| C | -0.001420 |
| D | 0.000122 |
| E | -0.026041 |
| F | -8.384331 |
| G | 98.23580 |
| H | -3.854931 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1962 |
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 | -20.86 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1962 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 51.544 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1962 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -25.201 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1962 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 43.339 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1962 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 530. to 1500. |
|---|---|
| A | 24.40010 |
| B | 6.661329×10-13 |
| C | 0.000000 |
| D | 0.000000 |
| E | 1.278980×10-13 |
| F | -28.44130 |
| G | 80.13499 |
| H | -20.86210 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1962 |
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 (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. to 402. | 402. to 530. |
|---|---|---|
| A | 15.38260 | 20.10490 |
| B | 10.41040 | 0.000000 |
| C | 0.000000 | 0.000000 |
| D | 0.000000 | 0.000000 |
| E | 0.008482 | 0.000000 |
| F | -30.22060 | -30.69771 |
| G | 58.89771 | 68.85540 |
| H | -25.20010 | -25.20010 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in March, 1962 | Data last reviewed in March, 1962 |
Phase change 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.
Data compiled by: William E. Acree, Jr., James S. Chickos
Enthalpy of vaporization
| ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 15.3 | 574. | UV | Su, Zhu, et al., 2002 | Based on data from 537. to 610. K. |
Enthalpy of fusion
| ΔfusH (kcal/mol) | Temperature (K) | Method | Reference |
|---|---|---|---|
| 4.85 | 537. | Sub-Vap | Su, Zhu, et al., 2002 |
Gas phase ion energetics 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.
Data evaluated as indicated in comments:
L - Sharon G. Lias
Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| IE (evaluated) | 9.509 ± 0.002 | eV | N/A | N/A | L |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 9.5088 ± 0.0022 | PI | Linn, Tzeng, et al., 1983 | LBLHLM |
| 9.5 | PE | Lee and Potts, 1981 | LLK |
| 9.50 | PE | Eland, 1970 | RDSH |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| HgI+ | 10.88 ± 0.05 | I | PI | Linn, Tzeng, et al., 1983 | LBLHLM |
| HgI+ | 10.88 ± 0.05 | I | EI | Linn, Tzeng, et al., 1983 | LBLHLM |
| HgI+ | 11.3 ± 0.4 | I | EI | Kiser, Dillard, et al., 1969 | RDSH |
| I+ | 13.12 ± 0.04 | HgI | EI | Linn, Tzeng, et al., 1983 | LBLHLM |
| I+ | 13.12 ± 0.04 | HgI | PI | Linn, Tzeng, et al., 1983 | LBLHLM |
| I+ | 15.5 ± 0.4 | ? | EI | Kiser, Dillard, et al., 1969 | RDSH |
| I2+ | 10.73 ± 0.04 | Hg | EI | Linn, Tzeng, et al., 1983 | LBLHLM |
| I2+ | 10.73 ± 0.04 | Hg | PI | Linn, Tzeng, et al., 1983 | LBLHLM |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, 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]
Su, Zhu, et al., 2002
Su, Ching-Hua; Zhu, Shen; Ramachandran, N.; Burger, A.,
Beer law constants and vapor pressures of HgI2 over HgI2(s,l),
Journal of Crystal Growth, 2002, 235, 1-4, 313-319, https://doi.org/10.1016/S0022-0248(01)01806-1
. [all data]
Linn, Tzeng, et al., 1983
Linn, S.H.; Tzeng, W.-B.; Brom, J.M., Jr.; Ng, C.Y.,
Molecular beam photoionization study of HgBr2 and HgI2,
J. Chem. Phys., 1983, 78, 50. [all data]
Lee and Potts, 1981
Lee, E.P.F.; Potts, A.W.,
Fine structure in the He(I)/He(II) photoelectron spectra of the metal valence (d) shells of the group IIB dihalides,
J. Electron Spectrosc. Relat. Phenom., 1981, 22, 247. [all data]
Eland, 1970
Eland, J.H.D.,
Photoelectron spectra and chemical bonding of mercury(II) compounds,
Intern. J. Mass Spectrom. Ion Phys., 1970, 4, 37. [all data]
Kiser, Dillard, et al., 1969
Kiser, R.W.; Dillard, J.G.; Dugger, D.L.,
Mass spectrometry of inorganic halides,
Advan. Chem. Ser., 1969, 72, 153. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy IE (evaluated) Recommended ionization 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) S°solid Entropy of solid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔfusH Enthalpy of fusion ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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