Home Symbol which looks like a small house Up Solid circle with an upward pointer in it

Trimethylaluminum

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, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, 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: José A. Martinho Simões

Quantity Value Units Method Reference Comment
Deltafgas-86.5 ± 4.8kJ/molReviewMartinho SimõesSelected data. The enthalpy of formation relies on -1891.3 ± 1.9 kJ/mol for the enthalpy of formation of Al(OOCMe)3(cr) and on 0.9 ± 0.2 kJ/mol for the enthalpy of solution of MeCOOH(l) in toluene Mortimer and Sellers, 1963. Liquid trimethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.007% Smith, 1972, so that the "real" liquid should be described as [Al(Me)3]2.
Deltafgas-57.0 ± 9.7kJ/molReviewMartinho SimõesLiquid trimethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.007% Smith, 1972, so that the "real" liquid should be described as [Al(Me)3]2.
Deltafgas-88.7kJ/molReviewMartinho SimõesThe enthalpy of formation was quoted from Smith, 1974 and relies on experimental data in Tröber and Stricker, 1966. Liquid trimethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.007% Smith, 1972, so that the "real" liquid should be described as [Al(Me)3]2.

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, 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
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Deltafliquid-149.7 ± 4.5kJ/molReviewMartinho SimõesSelected data. The enthalpy of formation relies on -1891.3 ± 1.9 kJ/mol for the enthalpy of formation of Al(OOCMe)3(cr) and on 0.9 ± 0.2 kJ/mol for the enthalpy of solution of MeCOOH(l) in toluene Mortimer and Sellers, 1963. Liquid trimethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.007% Smith, 1972, so that the "real" liquid should be described as [Al(Me)3]2.; MS
Deltafliquid-120.2 ± 9.6kJ/molReviewMartinho SimõesLiquid trimethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.007% Smith, 1972, so that the "real" liquid should be described as [Al(Me)3]2.; MS
Deltafliquid-151.9kJ/molCC-SBSmith, 1974Value corrected based on a set of ancillary data by J.A. Martinho Simões; The enthalpy of formation was quoted from Smith, 1974 and relies on experimental data in Tröber and Stricker, 1966. Liquid trimethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.007% Smith, 1972, so that the "real" liquid should be described as [Al(Me)3]2.; MS
Quantity Value Units Method Reference Comment
Deltacliquid-3184.4 ± 9.6kJ/molCC-SBLong and Norrish, 1949Please also see Cox and Pilcher, 1970. Liquid trimethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.007% Smith, 1972, so that the "real" liquid should be described as [Al(Me)3]2.; MS
Quantity Value Units Method Reference Comment
liquid209.41J/mol*KN/AMcCullough, Messerly, et al., 1963DH

Constant pressure heat capacity of liquid

Cp,liquid (J/mol*K) Temperature (K) Reference Comment
155.60298.15McCullough, Messerly, et al., 1963T = 10 to 380 K.; DH

Phase change data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, 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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny, director
MS - José A. Martinho Simões
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Ttriple288.43KN/AMcCullough, Messerly, et al., 1963, 2Uncertainty assigned by TRC = 0.02 K; TRC
Quantity Value Units Method Reference Comment
Deltavap63.2 ± 1.7kJ/molRSCMcCullough, Messerly, et al., 1963, 2MS

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Reference Comment
43.0288. - 293.Fulem, Ruzicka, et al., 2003AC
39.8351.McCullough, Messerly, et al., 1963Based on data from 336. - 400. K.; AC

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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

Temperature (K) A B C Reference Comment
336.96 - 400.274.679841724.231-31.398McCullough, Messerly, et al., 1963Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

DeltasubH (kJ/mol) Temperature (K) Reference Comment
60.1243. - 285.Fulem, Ruzicka, et al., 2003AC

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
8.7906288.43McCullough, Messerly, et al., 1963DH
8.79288.4Domalski and Hearing, 1996AC

Entropy of fusion

DeltafusS (J/mol*K) Temperature (K) Reference Comment
30.48288.43McCullough, Messerly, et al., 1963DH

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

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, 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
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

Hydrogen anion + Trimethylaluminum = (Hydrogen anion bullet Trimethylaluminum)

By formula: H- + C3H9Al = (H- bullet C3H9Al)

Quantity Value Units Method Reference Comment
Deltar>354.8 ± 2.1kJ/molIMRBden Berg, Ingemann, et al., 1992gas phase; Hydride affinity > (CF3)2CO. Computations indicate HOF(A-) ca. -46 kcal/mol, dHaff ca. 74 kcal/mol; B

C6H18Al2 (l) = 2Trimethylaluminum (l)

By formula: C6H18Al2 (l) = 2C3H9Al (l)

Quantity Value Units Method Reference Comment
Deltar81.2 ± 1.3kJ/molEqSSmith, 1972MS

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, 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:
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
9.09 ± 0.26EIWinters and Kiser, 1967RDSH
9.76PEBarker, Lappert, et al., 1975Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
Al+14.6 ± 0.2?EIWinters and Kiser, 1967RDSH
CH3Al+13.9 ± 0.3?EIWinters and Kiser, 1967RDSH
C2H6Al+10.1 ± 0.3CH3EIWinters and Kiser, 1967RDSH

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, 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: John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

Hydrogen anion + Trimethylaluminum = (Hydrogen anion bullet Trimethylaluminum)

By formula: H- + C3H9Al = (H- bullet C3H9Al)

Quantity Value Units Method Reference Comment
Deltar>354.8 ± 2.1kJ/molIMRBden Berg, Ingemann, et al., 1992gas phase; Hydride affinity > (CF3)2CO. Computations indicate HOF(A-) ca. -46 kcal/mol, dHaff ca. 74 kcal/mol

Mass spectrum (electron ionization)

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, 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

Spectrum

Notice: This spectrum may be better viewed with a Javascript and HTML 5 enabled browser.

Mass spectrum
For Zoom
1.) Enter the desired X axis range (e.g., 100, 200)
2.) Check here for automatic Y scaling
3.) Press here to zoom

Additional Data

View image of digitized spectrum (can be printed in landscape orientation).

Due to licensing restrictions, this spectrum cannot be downloaded.

Owner NIST Mass Spectrometry Data Center
Collection (C) 2014 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin Chemical Concepts
NIST MS number 151727

All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.


Vibrational and/or electronic energy levels

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), 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: Marilyn E. Jacox

State:   X


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

a1' 1 CH3 s-stretch 2920 gas Ra O'Brien and Ozin, 1971
2 CH3 deform. 1200 gas Ra O'Brien and Ozin, 1971
3 AlC3 s-stretch 530 gas Ra O'Brien and Ozin, 1971
a2 7 CH3 a-stretch 2948 s Ar IR Kvisle and Rytter, 1984
9 CH3 rock 744 vs gas IR Atiya, Grady, et al., 1991
9 CH3 rock 742 s Ar IR Kvisle and Rytter, 1984
e' 11 CH3 a-stretch 2982 m gas IR Ra O'Brien and Ozin, 1971
Atiya, Grady, et al., 1991
11 CH3 a-stretch 2971 s Ar IR Kvisle and Rytter, 1984
12 CH3 s-stretch 2901 m gas IR Ra O'Brien and Ozin, 1971
Atiya, Grady, et al., 1991
12 CH3 s-stretch 2905 m Ar IR Kvisle and Rytter, 1984
13 CH3 a-deform. 1430 w T gas IR Ra O'Brien and Ozin, 1971
Atiya, Grady, et al., 1991
13 CH3 a-deform. 1430 w T Ar IR Kvisle and Rytter, 1984
14 CH3 s-deform. 1202 s gas IR Atiya, Grady, et al., 1991
14 CH3 s-deform. 1196 s Ar IR Kvisle and Rytter, 1984
15 CH3 rock 754 s T gas IR Ra O'Brien and Ozin, 1971
Atiya, Grady, et al., 1991
16 AlC3 a-stretch 691 m s gas IR Atiya, Grady, et al., 1991
16 AlC3 a-stretch 689 s Ar IR Kvisle and Rytter, 1984
17 AlC3 deform. 170 gas Ra O'Brien and Ozin, 1971
e 18 CH3 a-stretch 2951 gas Ra O'Brien and Ozin, 1971
19 CH3 a-deform. 1440 gas Ra O'Brien and Ozin, 1971
20 CH3 rock 717 w Ar IR Kvisle and Rytter, 1984

Additional references: Jacox, 1994, page 400

Notes

wWeak
mMedium
sStrong
vsVery strong
TTentative assignment or approximate value

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, 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]

Mortimer and Sellers, 1963
Mortimer, C.T.; Sellers, P., J. Chem. Soc., 1963, 1978.. [all data]

Smith, 1972
Smith, M.B., J. Organometal. Chem., 1972, 46, 31. [all data]

Smith, 1974
Smith, M.B., J. Organometal. Chem., 1974, 76, 171. [all data]

Tröber and Stricker, 1966
Tröber, A.; Stricker, C., Wiss Z. Tech. Hochsch. Chem. "Carl Schlorlemmer" Leuna-Merseburg, 1966, 8, 34. [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]

McCullough, Messerly, et al., 1963
McCullough, J.P.; Messerly, J.F.; Moore, R.T.; Todd, S.S., Trimethylaluminum: thermodynamic functions in the solid and liquid states, 0-380°K, vapor pressure, heat of vaporization, and entropy in the ideal gas state, J. Phys. Chem., 1963, 67, 677-679. [all data]

McCullough, Messerly, et al., 1963, 2
McCullough, J.P.; Messerly, J.F.; Moore, R.T.; Todd, S.S., J. Phys. Chem., 1963, 67, 677. [all data]

Fulem, Ruzicka, et al., 2003
Fulem, M.; Ruzicka, K.; Ruzicka, V.; Hulicius, E.; Simecek, T.; Melichar, K.; Pangrác, J.; Rushworth, S.A.; Smith, L.M., Vapor pressure of metal organic precursors, Journal of Crystal Growth, 2003, 248, 99-107, https://doi.org/10.1016/S0022-0248(02)01840-7 . [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]

den Berg, Ingemann, et al., 1992
den Berg, K.J. van; Ingemann, S.; Nibbering, N.M.M., Gas Phase Reactions of Negative Ions with Trimethylaluminum: Formation and Reactivity of the Me3AlH- Ion., Org. Mass Spectrom., 1992, 27, 4, 523, https://doi.org/10.1002/oms.1210270427 . [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]

Barker, Lappert, et al., 1975
Barker, G.K.; Lappert, M.F.; Pedley, J.B.; Sharp, G.J.; Westwood, N.P.C., Bonding studies of boron and the group 3-5 elements. Part XV. He(I) photoelectron spectra of monomeric group 3 tri-halide, trimethyl, and mixed halogenomethyl species, J. Chem. Soc. Dalton Trans., 1975, 1765. [all data]

O'Brien and Ozin, 1971
O'Brien, R.J.; Ozin, G.A., J. Chem. Soc. A, 1971, 1136. [all data]

Kvisle and Rytter, 1984
Kvisle, S.; Rytter, E., Spectrochim. Acta 40A, 1984, 939. [all data]

Atiya, Grady, et al., 1991
Atiya, G.A.; Grady, A.S.; Russell, D.K.; Claxton, T.A., Spectrochim. Acta, 1991, 47A, 467. [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [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, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References