Methane, diiodo-
- Formula: CH2I2
- Molecular weight: 267.8355
- IUPAC Standard InChIKey: NZZFYRREKKOMAT-UHFFFAOYSA-N
- CAS Registry Number: 75-11-6
- 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. - Other names: Diiodomethane; Methylene diiodide; Methylene iodide; CH2I2; Dijodmethan; Methylenjodid; MI-Gee; Methyl diiodide; Mi-gee brand; NSC 35804
- Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Data at other public NIST sites:
- Options:
Data at NIST subscription sites:
NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.
Gas phase thermochemistry data
Go To: Top, Gas phase ion energetics data, Gas Chromatography, 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: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 28.1 ± 1.0 | kcal/mol | Cm | Kudchadker and Kudchadker, 1976 | |
ΔfH°gas | 29.2 ± 1.0 | kcal/mol | Eqk | Furuyama, Golden, et al., 1968 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Gas Chromatography, 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
LL - Sharon G. Lias and Joel F. Liebman
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 9.46 ± 0.02 | eV | N/A | N/A | L |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
9.46 ± 0.02 | PI | Tsai, Baer, et al., 1975 | LLK |
9.46 | PE | Von Niessen, Asbrink, et al., 1982 | Vertical value; LBLHLM |
9.46 | PE | Potts, Lempka, et al., 1970 | Vertical value; RDSH |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
CH2I+ | 10.42 | I | EI | Holmes, Lossing, et al., 1988 | LL |
CH2I+ | 10.55 ± 0.02 | I | PI | Tsai, Baer, et al., 1975 | LLK |
I+ | 13.2 ± 0.1 | CH2I | EI | DeCorpo, Bafus, et al., 1971 | LLK |
I+ | 13.8 | CH2I | EI | Franklin and Haney, 1970 | RDSH |
Gas Chromatography
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 by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Kovats' RI, non-polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Packed | OV-1 | 100. | 903. | Castello and Gerbino, 1988 | He, Chromosorb W DMCS; Column length: 3. m |
Packed | OV-1 | 125. | 911. | Castello and Gerbino, 1988 | He, Chromosorb W DMCS; Column length: 3. m |
Packed | OV-1 | 75. | 895. | Castello and Gerbino, 1988 | He, Chromosorb W DMCS; Column length: 3. m |
Kovats' RI, polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Packed | SP-1000 | 100. | 1510.47 | Castello and Gerbino, 1988 | He, Chromosorb W DMCS; Column length: 3. m |
Packed | SP-1000 | 125. | 1522.18 | Castello and Gerbino, 1988 | He, Chromosorb W DMCS; Column length: 3. m |
Van Den Dool and Kratz RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-1 | 876. | Helmig and Greenberg, 1995 | 60. m/0.33 mm/0.25 μm, 6. K/min; Tstart: -50. C; Tend: 180. C |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-1 | 878. | Helmig and Greenberg, 1995 | 60. m/0.33 mm/0.25 μm; Program: not specified |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Kudchadker and Kudchadker, 1976
Kudchadker, S.A.; Kudchadker, A.P.,
Erratum: Ideal gas thermodynamic properties of eight bromo- and iodomethanes,
J. Phys. Chem. Ref. Data, 1976, 5, 529-530. [all data]
Furuyama, Golden, et al., 1968
Furuyama, S.; Golden, D.M.; Benson, S.W.,
The thermochemistry of the gas-phase equilibrium 2CH3I = CH4 + CH2i2. The heat of formation of CH2I2,
J. Phys. Chem., 1968, 72, 4713-4715. [all data]
Tsai, Baer, et al., 1975
Tsai, B.P.; Baer, T.; Werner, A.S.; Lin, S.F.,
A photoelectron-photoion coincidence study of the ionization and fragment appearance potentials of bromo- and iodomethanes,
J. Phys. Chem., 1975, 79, 570. [all data]
Von Niessen, Asbrink, et al., 1982
Von Niessen, W.; Asbrink, L.; Bieri, G.,
30.4 nm He(II) Photoelectron spectra of organic molecules. Part VI. Halogeno-compounds (C,H,X: X = Cl, Br, I),
J. Electron Spectrosc. Relat. Phenom., 1982, 26, 173. [all data]
Potts, Lempka, et al., 1970
Potts, A.W.; Lempka, H.J.; Streets, D.G.; Price, W.C.,
Photoelectron spectra of the halides of elements in groups III, IV, V and VI,
Phil. Trans. Roy. Soc. (London), 1970, A268, 59. [all data]
Holmes, Lossing, et al., 1988
Holmes, J.L.; Lossing, F.P.; McFarlane, R.A.,
Stabilization energy and positional effects in halogen-substituted alkyl ions.,
Int. J. Mass Spectrom. Ion Phys., 1988, 86, 209. [all data]
DeCorpo, Bafus, et al., 1971
DeCorpo, J.J.; Bafus, D.A.; Franklin, J.L.,
Enthalpies of formation of the monohalomethyl radicals from mass spectrometric studies of the dihalomethanes,
J. Chem. Thermodyn., 1971, 3, 125. [all data]
Franklin and Haney, 1970
Franklin, J.L.; Haney, M.A.,
Energy distribution in ionic decomposition processes, Recent Developments in Mass Spectroscopy, ed. K. Ogata and T. Hayakawa Baltimore Univ. Park Press, Baltimore, MD, 1970, 909. [all data]
Castello and Gerbino, 1988
Castello, G.; Gerbino, T.C.,
Effect of Temperature on the Gas Chromatographic Separation of Halogenated Compounds on Polar and Non-Polar Stationary Phases,
J. Chromatogr., 1988, 437, 33-45, https://doi.org/10.1016/S0021-9673(00)90369-8
. [all data]
Helmig and Greenberg, 1995
Helmig, D.; Greenberg, J.,
Artifact formation from the use of potassium-iodide-based ozone traps during atmospheric sampling of trace organic gases,
J. Hi. Res. Chromatogr., 1995, 18, 1, 15-18, https://doi.org/10.1002/jhrc.1240180105
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Gas Chromatography, References
- Symbols used in this document:
AE Appearance energy IE (evaluated) Recommended ionization energy ΔfH°gas Enthalpy of formation of gas 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.