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Methane, iodo-

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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.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Deltafgas14.3 ± 1.4kJ/molEqkGolden, Walsh, et al., 1965Reanalyzed by Cox and Pilcher, 1970, Original value = 13.7 ± 0.67 kJ/mol
Deltafgas14.6 ± 1.0kJ/molEqkGoy and Pritchard, 1965Reanalyzed by Cox and Pilcher, 1970, Original value = 14.2 ± 1.0 kJ/mol
Deltafgas16. ± 1.kJ/molChydCarson, Carter, et al., 1961 

Condensed phase thermochemistry 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 compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Deltafliquid-13.6 ± 0.5kJ/molCcrCarson, Laye, et al., 1993ALS
Deltafliquid-12. ± 1.kJ/molChydCarson, Carter, et al., 1961ALS
Quantity Value Units Method Reference Comment
Deltacliquid-808.6 ± 0.3kJ/molCcrCarson, Laye, et al., 1993ALS

Constant pressure heat capacity of liquid

Cp,liquid (J/mol*K) Temperature (K) Reference Comment
82.75298.15Carson, Laye, et al., 1993DH
82.0298.15Shehatta, 1993DH
82.76298.2Low and Moelwyn-Hughes, 1962T = 293 to 308 K.; DH
82.68300.Harrison and Moelwyn-Hughes, 1957T = 243 to 303 K.; DH
148.1298.Kurbatov, 1948T = -56 to 35°C. Mean Cp five temperatures.; DH

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Condensed phase 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 compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
MS - José A. Martinho Simões

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

Iodide + Methane, iodo- = (Iodide bullet Methane, iodo-)

By formula: I- + CH3I = (I- bullet CH3I)

Quantity Value Units Method Reference Comment
Deltar35.7 ± 0.84kJ/molN/AVan Duzor, Wei, et al., 2010gas phase; B
Deltar32.6 ± 0.84kJ/molTDAsHiraoka, Fujita, et al., 1905gas phase; B
Deltar35.1 ± 2.1kJ/molN/AArnold, Neumark, et al., 1995gas phase; ZEKE data, shift relative to bare I-; B
Deltar34.7 ± 2.1kJ/molPDisCyr, Bishea, et al., 1992gas phase; B
Deltar38. ± 8.4kJ/molTDAsDougherty and Roberts, 1974gas phase; B,M
Quantity Value Units Method Reference Comment
Deltar68.6J/mol*KHPMSDougherty and Roberts, 1974gas phase; M
Quantity Value Units Method Reference Comment
Deltar11.4 ± 0.84kJ/molTDAsHiraoka, Fujita, et al., 1905gas phase; B
Deltar17.2 ± 1.3kJ/molTDAsDougherty and Roberts, 1974gas phase; B

C6H7N+ + Methane, iodo- = (C6H7N+ bullet Methane, iodo-)

By formula: C6H7N+ + CH3I = (C6H7N+ bullet CH3I)

Quantity Value Units Method Reference Comment
Deltar41.kJ/molPHPMSMeot-Ner (Mautner) and El-Shall, 1986gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Deltar75.J/mol*KN/AMeot-Ner (Mautner) and El-Shall, 1986gas phase; Entropy change calculated or estimated; M

Free energy of reaction

DeltarG° (kJ/mol) T (K) Method Reference Comment
18.299.PHPMSMeot-Ner (Mautner) and El-Shall, 1986gas phase; Entropy change calculated or estimated; M

Chlorine anion + Methane, iodo- = (Chlorine anion bullet Methane, iodo-)

By formula: Cl- + CH3I = (Cl- bullet CH3I)

Quantity Value Units Method Reference Comment
Deltar41.0 ± 0.84kJ/molTDAsDougherty and Roberts, 1974gas phase; B,M
Quantity Value Units Method Reference Comment
Deltar31.J/mol*KHPMSDougherty and Roberts, 1974gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
Deltar29. ± 5.4kJ/molTDAsDougherty and Roberts, 1974gas phase; B

Hydrogen iodide + Methane, iodo- = Methane + Iodine

By formula: HI + CH3I = CH4 + I2

Quantity Value Units Method Reference Comment
Deltar-52.55 ± 0.54kJ/molEqkGolden, Walsh, et al., 1965gas phase; ALS
Deltar-53.0 ± 0.2kJ/molEqkGoy and Pritchard, 1965gas phase; ALS
Deltar-46.2 ± 5.6kJ/molCmNichol and Ubbelohde, 1952gas phase; ALS

C12H16Nb (cr) + 2Iodine (cr) = C10H10I2Nb (cr) + 2Methane, iodo- (l)

By formula: C12H16Nb (cr) + 2I2 (cr) = C10H10I2Nb (cr) + 2CH3I (l)

Quantity Value Units Method Reference Comment
Deltar-242.3 ± 2.4kJ/molRSCDiogo, Simoni, et al., 1993The difference between the enthalpies of formation of Nb(Cp)2(I)2 and Nb(Cp)2(Me)2 is calculated as -215.1 ± 2.6 kJ/mol; MS

C14H22CoN5O4 (solution) + Iodine (solution) = C13H19CoIN5O4 (solution) + Methane, iodo- (solution)

By formula: C14H22CoN5O4 (solution) + I2 (solution) = C13H19CoIN5O4 (solution) + CH3I (solution)

Quantity Value Units Method Reference Comment
Deltar-92.9 ± 2.5kJ/molRSCToscano, Seligson, et al., 1989solvent: Bromoform; The enthalpy of solution of Co(py)(dmg)2(Me)(cr) was measured as 10.9 kJ/mol Toscano, Seligson, et al., 1989; MS

CH3I2- + 2Methane, iodo- = C2H6I3-

By formula: CH3I2- + 2CH3I = C2H6I3-

Quantity Value Units Method Reference Comment
Deltar29.3 ± 0.84kJ/molTDAsHiraoka, Fujita, et al., 1905gas phase; B
Quantity Value Units Method Reference Comment
Deltar4.35 ± 0.84kJ/molTDAsHiraoka, Fujita, et al., 1905gas phase; B

magnesium (cr) + Methane, iodo- (solution) = CH3IMg (solution)

By formula: Mg (cr) + CH3I (solution) = CH3IMg (solution)

Quantity Value Units Method Reference Comment
Deltar-273.6 ± 0.8kJ/molRSCCarson and Skinner, 1950solvent: Diethyl ether; It was assumed that MeI(l) has a negligible solution enthalpy in ether; MS

CH2I- + Hydrogen cation = Methane, iodo-

By formula: CH2I- + H+ = CH3I

Quantity Value Units Method Reference Comment
Deltar1616. ± 21.kJ/molG+TSIngemann and Nibbering, 1985gas phase; B
Quantity Value Units Method Reference Comment
Deltar1587. ± 20.kJ/molIMRBIngemann and Nibbering, 1985gas phase; B

Mercury, dimethyl- (l) + 2Iodine (cr) = 2Methane, iodo- (l) + Mercury diiodide (cr)

By formula: C2H6Hg (l) + 2I2 (cr) = 2CH3I (l) + HgI2 (cr)

Quantity Value Units Method Reference Comment
Deltar-184.5 ± 0.8kJ/molRSCHartley, Pritchard, et al., 1950Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

Gallium trimethyl (l) + 3Iodine (cr) = GaI3 (cr) + 3Methane, iodo- (l)

By formula: C3H9Ga (l) + 3I2 (cr) = GaI3 (cr) + 3CH3I (l)

Quantity Value Units Method Reference Comment
Deltar-200.0 ± 8.4kJ/molRSCFowell and Mortimer, 1958Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

Gallium trimethyl (l) + 2Iodine (cr) = CH3GaI2 (cr) + 2Methane, iodo- (l)

By formula: C3H9Ga (l) + 2I2 (cr) = CH3GaI2 (cr) + 2CH3I (l)

Quantity Value Units Method Reference Comment
Deltar-158.6 ± 4.2kJ/molRSCFowell and Mortimer, 1958Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

C16H34P2Ru (solution) + Methane, iodo- (solution) = C16H33IP2Ru (solution) + Methane (solution)

By formula: C16H34P2Ru (solution) + CH3I (solution) = C16H33IP2Ru (solution) + CH4 (solution)

Quantity Value Units Method Reference Comment
Deltar-188.3 ± 2.9kJ/molRSCLuo, Li, et al., 1995solvent: Tetrahydrofuran; MS

C22H36Zr (solution) + 2Iodine (solution) = C20H30I2Zr (solution) + 2Methane, iodo- (solution)

By formula: C22H36Zr (solution) + 2I2 (solution) = C20H30I2Zr (solution) + 2CH3I (solution)

Quantity Value Units Method Reference Comment
Deltar-292.9 ± 2.5kJ/molRSCSchock and Marks, 1988solvent: Toluene; MS

C8H5MoNaO3 (solution) + Methane, iodo- (l) = C9H8MoO3 (solution) + Sodium iodide (cr)

By formula: C8H5MoNaO3 (solution) + CH3I (l) = C9H8MoO3 (solution) + INa (cr)

Quantity Value Units Method Reference Comment
Deltar-32.2 ± 1.3kJ/molRSCNolan, López de la Vega, et al., 1986solvent: Tetrahydrofuran; MS

C12H16Zr (solution) + 2Iodine (solution) = C10H10I2Zr (solution) + 2Methane, iodo- (solution)

By formula: C12H16Zr (solution) + 2I2 (solution) = C10H10I2Zr (solution) + 2CH3I (solution)

Quantity Value Units Method Reference Comment
Deltar-291.2 ± 2.5kJ/molRSCSchock and Marks, 1988solvent: Toluene; MS

C22H36Hf (solution) + 2Iodine (solution) = C20H30HfI2 (solution) + 2Methane, iodo- (solution)

By formula: C22H36Hf (solution) + 2I2 (solution) = C20H30HfI2 (solution) + 2CH3I (solution)

Quantity Value Units Method Reference Comment
Deltar-265.3 ± 3.3kJ/molRSCSchock and Marks, 1988solvent: Toluene; MS

Hydrogen + 2Methane, iodo- = 2Methane + Iodine

By formula: H2 + 2CH3I = 2CH4 + I2

Quantity Value Units Method Reference Comment
Deltar-126. ± 3.kJ/molChydCarson, Carter, et al., 1961liquid phase; solvent: Ether; ALS

Methane + Methane, diiodo- = 2Methane, iodo-

By formula: CH4 + CH2I2 = 2CH3I

Quantity Value Units Method Reference Comment
Deltar-20. ± 4.2kJ/molEqkFuruyama, Golden, et al., 1968gas phase; ALS

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Golden, Walsh, et al., 1965
Golden, D.M.; Walsh, R.; Benson, S.W., The thermochemistry of the gas phase equilibrium I2 + CH4 «=» CH3I + HI and the heat of formation of the methyl radical, J. Am. Chem. Soc., 1965, 87, 4053-4057. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Goy and Pritchard, 1965
Goy, C.A.; Pritchard, H.O., Kinetics and thermodynamics of the reaction between iodine and methane and the heat of formation of methyl iodide, J. Phys. Chem., 1965, 69, 3040-3041. [all data]

Carson, Carter, et al., 1961
Carson, A.S.; Carter, W.; Pedley, J.B., The thermochemistry of reductions caused by lithium aluminium hydride I. The C-I bond dissociation energy in CH3I, Proc. Roy. Soc. London A, 1961, 260, 550-557. [all data]

Carson, Laye, et al., 1993
Carson, A.S.; Laye, P.G.; Pedley, J.B.; Welsby, A.M., The enthalpies of formation iodomethane, diiodomethane, triiodomethane, and tetraiodomethane by rotating combustion calorimetry, J. Chem. Thermodyn., 1993, 25, 261-269. [all data]

Shehatta, 1993
Shehatta, I., Heat capacity at constant pressure of some halogen compounds, Thermochim. Acta, 1993, 213, 1-10. [all data]

Low and Moelwyn-Hughes, 1962
Low, D.I.R.; Moelwyn-Hughes, E.A., The heat capacities of acetone, methyl iodide and mixtures thereof in the liquid state, Proc. Roy. Soc. (London), 1962, A267, 384-394. [all data]

Harrison and Moelwyn-Hughes, 1957
Harrison, D.; Moelwyn-Hughes, E.A., The heat capacities of certain liquids, Proc. Roy. Soc. (London), 1957, A239, 230-246. [all data]

Kurbatov, 1948
Kurbatov, V.Ya., Heat capacity of liquids. 2. Heat capacity and the temperature dependence of heat capacity from halogen derivatives of acylic hydrocarbons, Zh. Obshch. Kim., 1948, 18, 372-389. [all data]

Van Duzor, Wei, et al., 2010
Van Duzor, M.; Wei, J.; Mbaiwa, F.; Mabbs, R., I-center dot CH3X (X=Cl, Br, I) photodetachment: The effect of electron-molecule interactions in cluster anion photodetachment spectra and angular distributions, J. Chem. Phys., 2010, 133, 14, 144303, https://doi.org/10.1063/1.3487739 . [all data]

Hiraoka, Fujita, et al., 1905
Hiraoka, K.; Fujita, K.; Ishida, M.; Ichikawa, T.; Okada, H.; Hiizumi, K.; Wada, A.; Takao, K.; Yamabe, S.; Tsuchida, N., Gas-phase Ion/Molecule Reactions in C5F8, J. Phys. Chem. A (2005), 1905, 109, 6, 1049-1056., https://doi.org/10.1021/jp040251k . [all data]

Arnold, Neumark, et al., 1995
Arnold, C.C.; Neumark, D.M.; Cyr, D.M.; Johnson, M.A., Negative ion zero electron kinetic energy spectroscopy of I-center dot CH3I, J. Phys. Chem., 1995, 99, 6, 1633, https://doi.org/10.1021/j100006a002 . [all data]

Cyr, Bishea, et al., 1992
Cyr, D.M.; Bishea, G.A.; Scarton, M.G.; Johnson, M.A., Observation of Charge-Transfer Excited States in the I-.CH3I, I-.CH3Br, and I-.CH2Br2 S(N)2 Reaction Intermediates Using Photofragmentation, J. Chem. Phys., 1992, 97, 8, 5911, https://doi.org/10.1063/1.463752 . [all data]

Dougherty and Roberts, 1974
Dougherty, R.C.; Roberts, J.D., SN2 reactions in the gas phase. Nucleophilicity effects, Org. Mass Spectrom., 1974, 8, 81. [all data]

Meot-Ner (Mautner) and El-Shall, 1986
Meot-Ner (Mautner), M.; El-Shall, M.S., Ionic Charge Transfer Complexes. 1. Cationic Complexes with Delocalized and Partially Localized pi Systems, J. Am. Chem. Soc., 1986, 108, 15, 4386, https://doi.org/10.1021/ja00275a026 . [all data]

Nichol and Ubbelohde, 1952
Nichol, R.J.; Ubbelohde, A.R., A thermochemical evaluation of bond strengths in some carbon compounds. part II. Bond strengths based on the reaction CH3I + HI = CH4 + I2, J. Am. Chem. Soc., 1952, 415-421. [all data]

Diogo, Simoni, et al., 1993
Diogo, H.P.; Simoni, J.A.; Minas da Piedade, M.E.; Dias, A.R.; Martinho Simões, J.A., J. Am. Chem. Soc., 1993, 115, 2764. [all data]

Toscano, Seligson, et al., 1989
Toscano, P.J.; Seligson, A.L.; Curran, M.T.; Skrobutt, A.T.; Sonnenberger, D.C., Inorg. Chem., 1989, 28, 166; ibid. 1989. [all data]

Carson and Skinner, 1950
Carson, A.S.; Skinner, H.A., Nature, 1950, 165, 484. [all data]

Ingemann and Nibbering, 1985
Ingemann, S.; Nibbering, N.M.M., Gas-phase acidity of CH3X [X = P(CH3)2, SCH3, F, Cl, Br, I] compounds, J. Chem. Soc. Perkin Trans. 2, 1985, 837. [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, 2
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds in Academic Press, New York, 1970. [all data]

Fowell and Mortimer, 1958
Fowell, P.A.; Mortimer, C.T., J. Chem. Soc., 1958, 3734.. [all data]

Luo, Li, et al., 1995
Luo, L.; Li, C.; Cucullu, M.E.; Nolan, S.P., Organometallics, 1995, 14, 1333. [all data]

Schock and Marks, 1988
Schock, L.E.; Marks, T.J., J. Am. Chem. Soc., 1988, 110, 7701. [all data]

Nolan, López de la Vega, et al., 1986
Nolan, S.P.; López de la Vega, R.; Hoff, C.D., J. Organometal. Chem., 1986, 315, 187. [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]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, References