Iodine atom

• Formula: I
• Molecular weight: 126.90447
• IUPAC Standard InChI: InChI=1S/I Copy

  
• IUPAC Standard InChIKey: ZCYVEMRRCGMTRW-UHFFFAOYSA-N Copy
• CAS Registry Number: 14362-44-8
• Chemical structure:
  This structure is also available as a 2d Mol file
• 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:
  • Ion clustering data
• Data at other public NIST sites:
  • NIST Atomic Spectra Database - Lines Holdings (on physics web site)
  • NIST Atomic Spectra Database - Levels Holdings (on physics web site)
  • NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
  • Gas Phase Kinetics Database
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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.

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 (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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View table.

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
B - John E. Bartmess
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

C₁₂H₄F₃IO₄W (g) +  (g) = C₁₂H₄BrF₃O₄W (g) +  (g)

By formula: C₁₂H₄F₃IO₄W (g) + Br (g) = C₁₂H₄BrF₃O₄W (g) + I (g)

C₁₂H₇IO₄W (g) +  (g) = C₁₂H₇BrO₄W (g) +  (g)

By formula: C₁₂H₇IO₄W (g) + Br (g) = C₁₂H₇BrO₄W (g) + I (g)

C₁₁H₅IO₄W (g) +  (g) = C₁₁H₅BrO₄W (g) +  (g)

By formula: C₁₁H₅IO₄W (g) + Br (g) = C₁₁H₅BrO₄W (g) + I (g)

(I₂^- • 4294967295) +  = I₂^-

By formula: (I₂^- • 4294967295I) + I = I₂^-

=  +  + 

By formula: C₂H₄ClI = I + Cl + C₂H₄

 (g) +  (g) =  (g) +  (g)

By formula: I (g) + H₄Ge (g) = HI (g) + H₃Ge (g)

 (g) + C₃H₁₀Ge (g) = C₃H₉Ge (g) +  (g)

By formula: I (g) + C₃H₁₀Ge (g) = C₃H₉Ge (g) + HI (g)

C₄BrClO₄Re +  = C₄BrIO₄Re^-

By formula: C₄BrClO₄Re + I = C₄BrIO₄Re^-

C₄ClO₄Re +  = C₄ClIO₄Re^-

By formula: C₄ClO₄Re + I = C₄ClIO₄Re^-

C₄BrIMnO₄ +  = C₄BrIMnO₄^-

By formula: C₄BrIMnO₄ + I = C₄BrIMnO₄^-

C₄ClIMnO₄ +  = C₄ClIMnO₄^-

By formula: C₄ClIMnO₄ + I = C₄ClIMnO₄^-

C₆H₅O₃Re +  = C₆H₅IO₃Re^-

By formula: C₆H₅O₃Re + I = C₆H₅IO₃Re^-

CAS Reg. No. 121175-69-7 +  = C₆H₅IMnO₃^-

By formula: CAS Reg. No. 121175-69-7 + I = C₆H₅IMnO₃^-

C₅CrO₅^- +  = C₅CrIO₅^-

By formula: C₅CrO₅^- + I = C₅CrIO₅^-

C₃NiO₃^- +  = C₃INiO₃^-

By formula: C₃NiO₃^- + I = C₃INiO₃^-

C₄FeO₄^- +  = C₄FeIO₄^-

By formula: C₄FeO₄^- + I = C₄FeIO₄^-

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:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
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

View reactions leading to I⁺ (ion structure unspecified)

Electron affinity determinations

Ionization energy determinations

Anion protonation reactions

 +  =

By formula: I^- + H⁺ = HI

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.

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Fischer and Seitz, 1984
Fischer, H.; Seitz, F., J. Organometal. Chem., 1984, 268, 247. [all data]

Zanni, Taylor, et al., 1997
Zanni, M.T.; Taylor, T.R.; Greenblatt, J.; Soep, B.; Neumark, D.M., Characterization of the I2- Anion Ground State Using Conventional and Femtosecond Photoelectron Spectroscopy, J. Chem. Phys., 1997, 107, 19, 7613, https://doi.org/10.1063/1.475110 . [all data]

Minton, Felder, et al., 1984
Minton, T.K.; Felder, P.; Brudzynski, R.J.; Lee, Y.T., Photodissociation of 1,2-chloroiodoethane at 248 and 266 nm: The enthalpy of formation of CH₂ClCH₂I, J. Chem. Phys., 1984, 81, 1759-1769. [all data]

Noble and Walsh, 1983
Noble, P.N.; Walsh, R., Kinetics of the gas phase reaction between iodine and monogermane and the bond dissociation energy D(H₃Ge-H), Int. J. Chem. Kinet., 1983, 15, 547. [all data]

Doncaster and Walsh, 1979
Doncaster, A.M.; Walsh, R., J. Phys. Chem., 1979, 83, 578. [all data]

Jones, McDonald, et al., 1989
Jones, M.T.; McDonald, R.N.; Schell, P.L.; Ali, M.H., Kinetics and Mechanism of Halogen Atom Transfer Reactions between Haloalkanes and Several 17-Electron Transition Metal Complex Negative Ions in the Gas Phase, J. Am. Chem. Soc., 1989, 111, 16, 5983, https://doi.org/10.1021/ja00198a001 . [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Pelaez, Blondel, et al., 2009
Pelaez, R.J.; Blondel, C.; Delsart, C.; Drag, C., Pulsed photodetachment microscopy and the electron affinity of iodine, J. Phys. B: Atom. Mol. Opt. Phys., 2009, 42, 12, 125001, https://doi.org/10.1088/0953-4075/42/12/125001 . [all data]

Hanstorp and Gustafsson, 1992
Hanstorp, D.; Gustafsson, M., Determination of the Electron Affinity of Iodine, J. Phys. B: Atom. Mol. Opt. Phys., 1992, 25, 8, 1773, https://doi.org/10.1088/0953-4075/25/8/012 . [all data]

Webster, McDermid, et al., 1983
Webster, C.R.; McDermid, I.S.; Rettner, C.T., Laser optogalvanic photodetachment spectroscopy: A new technique for studying photodetachment thresholds with application to I-, J. Chem. Phys., 1983, 78, 646. [all data]

Neiger, 1975
Neiger, M., Quantitative Investifgation of the Radiation of the Negative Iodine Ion, Z. Naturfor., 1975, 30, 474. [all data]

Piani, Becucci, et al., 2008
Piani, G.; Becucci, M.; Bowen, M.S.; Oakman, J.; Hu, Q.; Continetti, R.E., Photodetachment and dissociation dynamics of microsolvated iodide clusters, Phys. Scripta, 2008, 78, 5, 058110, https://doi.org/10.1088/0031-8949/78/05/058110 . [all data]

Berry and Reimann, 1963
Berry, R.S.; Reimann, C.W., Absorption Spectrum of Gaseous Fluoride and the Electron Affinities of the Halogen Atoms, J. Chem. Phys., 1963, 38, 7, 1540, https://doi.org/10.1063/1.1776916 . [all data]

Check, Faust, et al., 2001
Check, C.E.; Faust, T.O.; Bailey, J.M.; Wright, B.J.; Gilbert, T.M.; Sunderlin, L.S., Addition of Polarization and Diffuse Functions to the LANL2DZ Basis Set for P-Block Elements, J. Phys. Chem. A,, 2001, 105, 34, 8111, https://doi.org/10.1021/jp011945l . [all data]

Lide, 1992
Lide, D.R. (Editor), Ionization potentials of atoms and atomic ions in Handbook of Chem. and Phys., 1992, 10-211. [all data]

Grade and Rosinger, 1985
Grade, M.; Rosinger, W., Correlation of electronic structures and stabilities of gaseous FeI₂, Fe₂I₂ and Fe₂I₄ molecules, solid [FeI₂], and iodine adsorbed on [Fe], Surf. Sci., 1985, 156, 920. [all data]

Hoareau, Cabaud, et al., 1981
Hoareau, A.; Cabaud, B.; Melinon, P., Time-of-flight mass spectroscopy of supersonic beam of metallic vapours: Intensities and appearance potentials of Mx aggregates, Surf. Sci., 1981, 106, 195. [all data]

Pittermann and Weil, 1980
Pittermann, U.; Weil, K.G., Massenspektrometrische Untersuchungen an Silberhalogeniden V: Verdampfung von Silberiodid, Ber. Bunsen-Ges. Phys. Chem., 1980, 84, 542. [all data]

Imre and Koenig, 1980
Imre, D.; Koenig, T., The He(I) photoelectron spectrum of atomic iodine by photodissociation of molecular iodine, Chem. Phys. Lett., 1980, 73, 62. [all data]

De Leeuw, Mooyman, et al., 1978
De Leeuw, D.M.; Mooyman, R.; De Lange, C.A., He(I) photoelectron spectroscopy of halogen atoms, Chem. Phys. Lett., 1978, 54, 231. [all data]

Moore, 1970
Moore, C.E., Ionization potentials and ionization limits derived from the analyses of optical spectra, Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.), 1970, 34, 1. [all data]

Minnhagen, 1962
Minnhagen, L., The energy levels of neutral atomic iodine, Ark. Fys., 1962, 21, 415. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, References

• Symbols used in this document:
  

  EA	Electron affinity
  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
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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