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:
This structure is also available as a 2d Mol file or as a computed 3d SD file
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Gas 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°gas | -16.13 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1962 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 336.21 | J/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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 1500. to 6000. |
|---|---|
| A | 62.33281 |
| B | 0.021751 |
| C | -0.005941 |
| D | 0.000511 |
| E | -0.108958 |
| F | -35.08004 |
| G | 411.0186 |
| H | -16.12903 |
| 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 | -87.29 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1962 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 215.66 | J/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1962 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -105.44 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1962 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 181.33 | J/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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 530. to 1500. |
|---|---|
| A | 102.0900 |
| B | 2.787100×10-12 |
| C | 0.000000 |
| D | 0.000000 |
| E | 5.351253×10-13 |
| F | -118.9984 |
| G | 335.2848 |
| H | -87.28703 |
| 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 (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 402. | 402. to 530. |
|---|---|---|
| A | 64.36080 | 84.11890 |
| B | 43.55711 | 0.000000 |
| C | 0.000000 | 0.000000 |
| D | 0.000000 | 0.000000 |
| E | 0.035489 | 0.000000 |
| F | -126.4430 | -128.4392 |
| G | 246.4280 | 288.0910 |
| H | -105.4372 | -105.4372 |
| 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 (kJ/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 64.0 | 574. | UV | Su, Zhu, et al., 2002 | Based on data from 537. to 610. K. |
Enthalpy of fusion
| ΔfusH (kJ/mol) | Temperature (K) | Method | Reference |
|---|---|---|---|
| 20.3 | 537. | Sub-Vap | Su, Zhu, et al., 2002 |
Reaction 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.
Data compiled as indicated in comments:
MS - José A. Martinho Simões
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
(l) + 2
(cr) = 2
(l) +
(cr)
By formula: C2H6Hg (l) + 2I2 (cr) = 2CH3I (l) + HgI2 (cr)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -184.5 ± 0.8 | kJ/mol | RSC | Hartley, Pritchard, et al., 1950 | Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970.; MS |
C6H14Hg (l) + (cr) = 2C3H7HgI (cr)
By formula: C6H14Hg (l) + HgI2 (cr) = 2C3H7HgI (cr)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -65.3 ± 1.7 | kJ/mol | RSC | Mortimer, Pritchard, et al., 1952 | Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970.; MS |
C6H14Hg (l) + (cr) = 2C3H7HgI (cr)
By formula: C6H14Hg (l) + HgI2 (cr) = 2C3H7HgI (cr)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -52.9 ± 1.7 | kJ/mol | RSC | Mortimer, Pritchard, et al., 1952 | Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970.; MS |
(l) +
(cr) = 2
(cr)
By formula: C2H6Hg (l) + HgI2 (cr) = 2CH3HgI (cr)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -39.8 ± 1.6 | kJ/mol | RSC | Hartley, Pritchard, et al., 1950 | Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970.; MS |
(l) +
(cr) = 2C2H5HgI (cr)
By formula: C4H10Hg (l) + HgI2 (cr) = 2C2H5HgI (cr)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -55.2 ± 5.4 | kJ/mol | RSC | Hartley, Pritchard, et al., 1951 | Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970.; MS |
(l) +
(cr) = 2
(cr)
By formula: C12H10Hg (l) + HgI2 (cr) = 2C6H5HgI (cr)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -21.8 ± 0.8 | kJ/mol | RSC | Hartley, Pritchard, et al., 1951 | Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970.; MS |
2 +
= C6H14Hg + 2
By formula: 2C3H7I + HgI2 = C6H14Hg + 2I2
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 242.3 ± 1.9 | kJ/mol | Cm | Mortimer, Pritchard, et al., 1952, 2 | liquid phase; ALS |
2 +
= C6H14Hg + 2
By formula: 2C3H7I + HgI2 = C6H14Hg + 2I2
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 215.7 ± 2.4 | kJ/mol | Cm | Mortimer, Pritchard, et al., 1952, 2 | liquid phase; ALS |
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, Reaction thermochemistry data, Gas phase ion energetics data, 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]
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]
Hartley, Pritchard, et al., 1950
Hartley, K.; Pritchard, H.O.; Skinner, H.A.,
Thermochemistry of metallic alkyls. III.?mercury dimethyl and mercury methyl halides,
Trans. Faraday Soc., 1950, 46, 1019, https://doi.org/10.1039/tf9504601019
. [all data]
Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J.,
Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]
Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G.,
Thermochemistry of Organic and Organometallic Compounds
in Academic Press, New York, 1970. [all data]
Mortimer, Pritchard, et al., 1952
Mortimer, C.T.; Pritchard, H.O.; Skinner, H.A.,
Thermochemistry of metallic alkyls. Part V.?Mercury di-propyl and mercury di-isopropyl,
Trans. Faraday Soc., 1952, 48, 220, https://doi.org/10.1039/tf9524800220
. [all data]
Hartley, Pritchard, et al., 1951
Hartley, K.; Pritchard, H.O.; Skinner, H.A.,
Thermochemistry of metallic alkyls. IV. Mercury diethyl and mercury diphenyl,
Trans. Faraday Soc., 1951, 47, 254, https://doi.org/10.1039/tf9514700254
. [all data]
Mortimer, Pritchard, et al., 1952, 2
Mortimer, C.T.; Pritchard, H.O.; Skinner, H.A.,
Thermochemistry of metallic alkyls. Part V - Mercury di-propyl and mercury di-isopropyl,
Trans. Faraday Soc., 1952, 48, 220-229. [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
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- 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 ΔrH° Enthalpy of reaction at standard conditions ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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