Mercury diiodide

• Formula: HgI₂
• Molecular weight: 454.40
• IUPAC Standard InChI: InChI=1S/Hg.2HI/h;2*1H/q+2;;/p-2 Copy

  
• IUPAC Standard InChIKey: YFDLHELOZYVNJE-UHFFFAOYSA-L Copy
• 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
  The 3d structure may be viewed using Java or Javascript.
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Condensed phase thermochemistry data
  • Phase change data
• Data at other public NIST sites:
  • X-ray Photoelectron Spectroscopy Database, version 5.0
• Options:
  • Switch to calorie-based units

Gas phase thermochemistry data

Go To: Top, Reaction thermochemistry 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.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = 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
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry 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.

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)

C₆H₁₄Hg (l) +  (cr) = 2C₃H₇HgI (cr)

By formula: C₆H₁₄Hg (l) + HgI₂ (cr) = 2C₃H₇HgI (cr)

C₆H₁₄Hg (l) +  (cr) = 2C₃H₇HgI (cr)

By formula: C₆H₁₄Hg (l) + HgI₂ (cr) = 2C₃H₇HgI (cr)

 (l) +  (cr) = 2 (cr)

By formula: C₂H₆Hg (l) + HgI₂ (cr) = 2CH₃HgI (cr)

 (l) +  (cr) = 2C₂H₅HgI (cr)

By formula: C₄H₁₀Hg (l) + HgI₂ (cr) = 2C₂H₅HgI (cr)

 (l) +  (cr) = 2 (cr)

By formula: C₁₂H₁₀Hg (l) + HgI₂ (cr) = 2C₆H₅HgI (cr)

2 +  = C₆H₁₄Hg + 2

By formula: 2C₃H₇I + HgI₂ = C₆H₁₄Hg + 2I₂

2 +  = C₆H₁₄Hg + 2

By formula: 2C₃H₇I + HgI₂ = C₆H₁₄Hg + 2I₂

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Reaction 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 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

Ionization energy determinations

Appearance energy determinations

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry 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]

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

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry 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)
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
• The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
• Customer support for NIST Standard Reference Data products.