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Dimethylzinc

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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: José A. Martinho Simões

Quantity Value Units Method Reference Comment
Deltafgas55.4 ± 5.9kJ/molReviewMartinho Simões 
Deltafgas52.9 ± 1.3kJ/molReviewMartinho Simões 

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.

Data compiled as indicated in comments:
MS - José A. Martinho Simões
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Deltafliquid25.0 ± 5.9kJ/molReviewMartinho SimõesMS
Deltafliquid22.5 ± 1.3kJ/molReviewMartinho SimõesMS
Quantity Value Units Method Reference Comment
Deltacliquid-2020.0 ± 5.9kJ/molCC-SBLong and Norrish, 1949Please also see Cox and Pilcher, 1970.; MS
Quantity Value Units Method Reference Comment
liquid201.6J/mol*KN/ASheiman, Nistratov, et al., 1984DH

Constant pressure heat capacity of liquid

Cp,liquid (J/mol*K) Temperature (K) Reference Comment
129.2298.15Sheiman, Nistratov, et al., 1984T = 5 to 300 K.; DH

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 as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny, director
MS - José A. Martinho Simões
AC - William E. Acree, Jr., James S. Chickos
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Ttriple230.13KN/ASheiman, Nistratov, et al., 1984, 2Crystal phase 1 phase; Uncertainty assigned by TRC = 0.02 K; TRC
Quantity Value Units Method Reference Comment
Deltavap30.4 ± 0.2kJ/molCC-SBSokolovskii and Baev, 1984Another value for the enthalpy of vaporization has been reported: 29.5 ± 0.4 kJ/mol Long and Cattanach, 1961.; MS

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
30.4 ± 0.1273. - 313.N/ABaev, 1997AC
29.9283.BGBamford, Levi, et al., 1946Based on data from 248. - 318. K.; AC

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
6.83230.1Domalski and Hearing, 1996AC

Entropy of fusion

DeltafusS (J/mol*K) Temperature (K) Reference Comment
5.05210.3Domalski and Hearing, 1996CAL
29.68230.1

Enthalpy of phase transition

DeltaHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
1.061210.26crystaline, IIcrystaline, ISheiman, Nistratov, et al., 1984DH
6.830230.13crystaline, IliquidSheiman, Nistratov, et al., 1984DH

Entropy of phase transition

DeltaStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
5.05210.26crystaline, IIcrystaline, ISheiman, Nistratov, et al., 1984DH
29.67230.13crystaline, IliquidSheiman, Nistratov, et al., 1984DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


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 by: 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

Dimethylzinc (l) + (Sulfuric Acid bullet 100Water) (solution) = 2Methane (g) + (zinc sulphate bullet 100Water) (solution)

By formula: C2H6Zn (l) + (H2O4S bullet 100H2O) (solution) = 2CH4 (g) + (O4SZn bullet 100H2O) (solution)

Quantity Value Units Method Reference Comment
Deltar-341.8 ± 0.8kJ/molRSCCarson, Hartley, et al., 1949Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970.

Dimethylzinc (g) = Methyl zinc (g) + Methane (g)

By formula: C2H6Zn (g) = CH3Zn (g) + CH4 (g)

Quantity Value Units Method Reference Comment
Deltar266.5 ± 6.3kJ/molKinGJackson, 1989 
Deltar276. - 298.kJ/molN/ASmith and Patrick, 1983 
Deltar285. ± 17.kJ/molN/AMcMillen and Golden, 1982 

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 compiled as indicated in comments:
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

IE (eV) Method Reference Comment
9.00 ± 0.02PIDistefano and Dibeler, 1970RDSH
8.86 ± 0.15EIWinters and Kiser, 1967RDSH
9.4PECreber and Bancroft, 1980Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
CH3+15.1 ± 0.5?EIWinters and Kiser, 1967RDSH
CH3Zn+10.22 ± 0.02CH3PIDistefano and Dibeler, 1970RDSH
CH3Zn+11.2 ± 0.2CH3EIWinters and Kiser, 1967RDSH
ZnH+13.9 ± 0.4?EIWinters and Kiser, 1967RDSH
Zn+13.13 ± 0.022CH3PIDistefano and Dibeler, 1970RDSH
Zn+13.4 ± 0.32CH3EIWinters and Kiser, 1967RDSH

Vibrational and/or electronic energy levels

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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: Takehiko Shimanouchi

Symmetry:   D3h'(G+36)     Symmetry Number sigma = 6


 Sym.   No   Approximate   Selected Freq.  Infrared   Raman   Comments 
 Species   type of mode   Value   Rating   Value  Phase  Value  Phase

a1' 1 CH3 s-str 2900  C  ia 2900 S p liq. Free rotation
a1' 2 CH3 s-deform 1157  C  ia 1157 S p liq. Free rotation
a1' 3 CZn s-str 503  C  ia 503 VS p liq. Free rotation
a1 4 Torsion  ia  ia Free rotation
a2 5 CH3 s-str 2915  C 2915 S gas  ia Free rotation
a2 6 CH3 s-deform 1183  C 1183 M gas  ia Free rotation
a2 7 CZn a-str 613  C 613 gas  ia Free rotation
e' 8 CH3 d-str 2966  C 2966 S gas 2947 liq. Free rotation
e' 9 CH3 d-deform 1304  C 1301 M gas 1302 W liq. Free rotation
e' 10 CH3 rock 704  C 704 S gas Free rotation
e' 11 CZnC deform 134  D 134 sh liq. Free rotation
e 12 CH3 d-str 2843  C 2843 gas 2830 liq. Free rotation
e 13 CH3 d-deform 1434  C 1434 W liq. Free rotation
e 14 CH3 rock 620  C 620 M liq. Free rotation

Source: Shimanouchi, 1972

Notes

VSVery strong
SStrong
MMedium
WWeak
iaInactive
shShoulder
pPolarized
C3~6 cm-1 uncertainty
D6~15 cm-1 uncertainty

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, NIST Free Links, Notes

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

Martinho Simões
Martinho Simões, J.A., Private communication (see http://webbook.nist.gov/chemistry/om/). [all data]

Long and Norrish, 1949
Long, L.H.; Norrish, R.G.W., Phil. Trans. Roy. Soc. (London), 1949, A241, 587. [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]

Sheiman, Nistratov, et al., 1984
Sheiman, M.S.; Nistratov, V.P.; Kamelova, G.P.; Rabinovich, I.B., Low-temperature heat capacity of organic compounds of aluminum and zinc, Probl. Kalorim. Khim. Termodin., Dokl. Vses. Konf., 10th, 1984, 2, 457-459. [all data]

Sheiman, Nistratov, et al., 1984, 2
Sheiman, M.S.; Nistratov, V.P.; Kamelova, G.P.; Rabinovich, I.B., Low-temperature heat capacity of organic compounds of aluminum and zinc in Probl. Kalorim. Khim. Termodin., Dokl. Vses. Konf., 10th, Akad. Nauk SSSS Inst. Khim. Fiz.: Chernogolovka, USSR, Vol. 2 2, 1984. [all data]

Sokolovskii and Baev, 1984
Sokolovskii, A.E.; Baev, A.K., Zh. Obshch. Khim., 1984, 54, 103. [all data]

Long and Cattanach, 1961
Long, L.H.; Cattanach, J., J. Inorg. Nucl. Chem., 1961, 20, 340. [all data]

Baev, 1997
Baev, A.K., Thermodynamic study of structural changes in solutions of dimethyl-zinc with methyl compounds of Group VIB elements, Zh. Neorg. Khim., 1997, 42, 4, 662. [all data]

Bamford, Levi, et al., 1946
Bamford, C.H.; Levi, D.L.; Newitt, D.M., 91. Physical and chemical properties of organo-metallic compounds. Part I. The vapour pressures and freezing points of simple metal alkyls of Groups II, III, and V, J. Chem. Soc., 1946, 468, https://doi.org/10.1039/jr9460000468 . [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]

Carson, Hartley, et al., 1949
Carson, A.S.; Hartley, K.; Skinner, H.A., Thermochemistry of metal alkyls. Part II.?The bond dissociation energies of some Zn?C and Cd?C bonds, and of Et?I., Trans. Faraday Soc., 1949, 45, 1159, https://doi.org/10.1039/tf9494501159 . [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]

Jackson, 1989
Jackson, R.L., Chem. Phys. Lett., 1989, 163, 315. [all data]

Smith and Patrick, 1983
Smith, G.P.; Patrick, R., Int. J. Chem. Kinet., 1983, 15, 167. [all data]

McMillen and Golden, 1982
McMillen, D.F.; Golden, D.M., Hydrocarbon bond dissociation energies, Ann. Rev. Phys. Chem., 1982, 33, 493. [all data]

Distefano and Dibeler, 1970
Distefano, G.; Dibeler, V.H., Photoionization study of the dimethyl compounds of zinc, cadmium, and mercury, Intern. J. Mass Spectrom. Ion Phys., 1970, 4, 59. [all data]

Winters and Kiser, 1967
Winters, R.E.; Kiser, R.W., Ionization and fragmentation of dimethylzinc, trimethylaluminum, and trimethylantimony, J. Organometal. Chem., 1967, 10, 7. [all data]

Creber and Bancroft, 1980
Creber, D.K.; Bancroft, G.M., Photoelectron studies of dialkyl group 2B compounds: Ligand field splittings intensity variations with photon energy, Inorg. Chem., 1980, 19, 643. [all data]

Shimanouchi, 1972
Shimanouchi, T., Tables of Molecular Vibrational Frequencies Consolidated Volume II, J. Phys. Chem. Ref. Data, 1972, 6, 3, 993-1102. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, NIST Free Links, References