Trimethylaluminum
- Formula: C3H9Al
- Molecular weight: 72.0851
- IUPAC Standard InChI: InChI=1S/3CH3.Al/h3*1H3;
- IUPAC Standard InChIKey: JLTRXTDYQLMHGR-UHFFFAOYSA-N
- CAS Registry Number: 75-24-1
- 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: (CH3)3Al; Aluminum, trimethyl-; Trimethylalane; Trimethylaluminium; UN 1103
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Reaction thermochemistry data
Go To: Top, 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 as indicated in comments:
B - John E. Bartmess
MS - José A. Martinho Simões
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Individual Reactions
+
= (
•
)
By formula: H- + C3H9Al = (H- • C3H9Al)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | >84.80 ± 0.50 | kcal/mol | IMRB | den Berg, Ingemann, et al., 1992 | gas phase; Hydride affinity > (CF3)2CO. Computations indicate HOF(A-) ca. -46 kcal/mol, dHaff ca. 74 kcal/mol; B |
C6H18Al2 (l) = 2 (l)
By formula: C6H18Al2 (l) = 2C3H9Al (l)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 19.4 ± 0.31 | kcal/mol | EqS | Smith, 1972 | MS |
Gas phase ion energetics data
Go To: Top, 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:
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 ± 0.26 | EI | Winters and Kiser, 1967 | RDSH |
| 9.76 | PE | Barker, Lappert, et al., 1975 | Vertical value; LLK |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| Al+ | 14.6 ± 0.2 | ? | EI | Winters and Kiser, 1967 | RDSH |
| CH3Al+ | 13.9 ± 0.3 | ? | EI | Winters and Kiser, 1967 | RDSH |
| C2H6Al+ | 10.1 ± 0.3 | CH3 | EI | Winters and Kiser, 1967 | RDSH |
References
Go To: Top, 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.
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]
Smith, 1972
Smith, M.B.,
J. Organometal. Chem., 1972, 46, 31. [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]
Notes
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy ΔrH° Enthalpy of reaction at standard conditions ΔrS° Entropy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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