Aluminum, triethyl-

Formula: C₆H₁₅Al
Molecular weight: 114.1648
IUPAC Standard InChI: InChI=1S/3C2H5.Al/c3*1-2;/h3*1H2,2H3;
IUPAC Standard InChIKey: VOITXYVAKOUIBA-UHFFFAOYSA-N
CAS Registry Number: 97-93-8
Chemical structure:
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Other names: Triethylaluminum; TEA; Triethylaluminium; UN 1102
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Gas phase thermochemistry data

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Data compiled by: José A. Martinho Simões

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	-27.3 ± 1.3	kcal/mol	Review	Martinho Simões	Selected data. The enthalpy of formation relies on -428.51 ± 0.45 kcal/mol for the enthalpy of formation of Al(acac)3(cr). Liquid triethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.1% Smith, 1967, so that the "real" liquid should be described as [Al(Et)3]2.
Δ_fH°_gas	-23.6 ± 1.6	kcal/mol	Review	Martinho Simões	Liquid triethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.1% Smith, 1967, so that the "real" liquid should be described as [Al(Et)3]2.
Δ_fH°_gas	-39.13 ± 0.88	kcal/mol	Review	Martinho Simões	Liquid triethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.1% Smith, 1967, so that the "real" liquid should be described as [Al(Et)3]2.
Δ_fH°_gas	-34.4 ± 2.2	kcal/mol	Review	Martinho Simões	Liquid triethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.1% Smith, 1967, so that the "real" liquid should be described as [Al(Et)3]2
Δ_fH°_gas	-23.9 ± 1.2	kcal/mol	Review	Martinho Simões	The enthalpy of formation was quoted from Tel'noi and Rabinovich, 1980 and relies on experimental data in Fic, 1966. Liquid triethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.1% Smith, 1967, so that the "real" liquid should be described as [Al(Et)3]2.

Reaction thermochemistry data

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Data compiled by: José A. Martinho Simões

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Individual Reactions

C₁₂H₃₀Al₂ (g) = 2 Aluminum, triethyl- (g)

By formula: C₁₂H₃₀Al₂ (g) = 2C₆H₁₅Al (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	18.2 ± 0.31	kcal/mol	N/A	Smith, 1972	The values were derived from the thermochemistry of the equilibrium in the liquid phase and from vapor pressure data Smith, 1972.

3 (g) + Aluminum, triethyl- (l) = AlH₃O₃ (amorphous) + 3 (g)

By formula: 3H₂O (g) + C₆H₁₅Al (l) = AlH₃O₃ (amorphous) + 3C₂H₆ (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-154.7 ± 1.5	kcal/mol	RSC	Fowell, 1961	Please also see Cox and Pilcher, 1970. Liquid triethylaluminum contains a very small molar fraction of monomer at 298 K, ca. 0.1% Smith, 1967, so that the "real" liquid should be described as [Al(Et)3]2.

C₁₂H₃₀Al₂ (l) = 2 Aluminum, triethyl- (l)

By formula: C₁₂H₃₀Al₂ (l) = 2C₆H₁₅Al (l)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.9 ± 0.24	kcal/mol	EqS	Smith, 1967

AlI₃ (cr) + 2 Aluminum, triethyl- (l) = 3C₄H₁₀AlI (l)

By formula: AlI₃ (cr) + 2C₆H₁₅Al (l) = 3C₄H₁₀AlI (l)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-17.5 ± 0.33	kcal/mol	RSC	Smith, 1974	Please also see Pedley and Rylance, 1977.

AlBr₃ (cr) + 2 Aluminum, triethyl- (l) = 3C₄H₁₀AlBr (l)

By formula: AlBr₃ (cr) + 2C₆H₁₅Al (l) = 3C₄H₁₀AlBr (l)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-21.8 ± 0.43	kcal/mol	RSC	Smith, 1974	Please also see Pedley and Rylance, 1977.

AlCl₃ (cr) + 2 Aluminum, triethyl- (l) = 3 (l)

By formula: AlCl₃ (cr) + 2C₆H₁₅Al (l) = 3C₄H₁₀AlCl (l)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-16.0 ± 0.31	kcal/mol	RSC	Smith, 1974	Please also see Pedley and Rylance, 1977.

C₂H₅AlI₂ (l) + Aluminum, triethyl- (l) = 2C₄H₁₀AlI (l)

By formula: C₂H₅AlI₂ (l) + C₆H₁₅Al (l) = 2C₄H₁₀AlI (l)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-8.7 ± 0.2	kcal/mol	RSC	Smith, 1974	Please also see Pedley and Rylance, 1977.

C₂H₅AlBr₂ (l) + Aluminum, triethyl- (l) = 2C₄H₁₀AlBr (l)

By formula: C₂H₅AlBr₂ (l) + C₆H₁₅Al (l) = 2C₄H₁₀AlBr (l)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-9.5 ± 0.2	kcal/mol	RSC	Smith, 1974	Please also see Pedley and Rylance, 1977.

(l) + Aluminum, triethyl- (l) = 2 (l)

By formula: C₂H₅AlCl₂ (l) + C₆H₁₅Al (l) = 2C₄H₁₀AlCl (l)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-9.4 ± 0.2	kcal/mol	RSC	Smith, 1974	Please also see Pedley and Rylance, 1977.

References

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

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

Smith, 1967
Smith, M.B., J. Phys. Chem., 1967, 71, 364. [all data]

Tel'noi and Rabinovich, 1980
Tel'noi, V.I.; Rabinovich, I.B., Russ. Chem. Rev., 1980, 49, 603. [all data]

Fic, 1966
Fic, V., Chem. Prum., 1966, 16, 607. [all data]

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

Fowell, 1961
Fowell, P.A., Ph. D. Thesis, University of Manchester, 1961. [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]

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

Notes

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Symbols used in this document:

Δ_fH°_gas Enthalpy of formation of gas at standard conditions

Δ_rH° Enthalpy of reaction at standard conditions

Δ_rS° Entropy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions
Δ_rS°	Entropy of reaction at standard conditions