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Experimental data for (CH3)3CC(CH3)3 (tetramethylbutane)

22 02 02 11 45
Other names
Ethane, hexamethyl-; Hexamethylethane; 2,2,3,3-Tetramethylbutane; Butane, 2,2,3,3-tetramethyl-;
INChI INChIKey SMILES IUPAC name
InChI=1S/C8H18/c1-7(2,3)8(4,5)6/h1-6H3 OMMLUKLXGSRPHK-UHFFFAOYSA-N CC(C)(C)C(C)(C)C 2,2,3,3-Tetramethylbutane
State Conformation
1A1 D3D
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation -226.20 2.00 kJ mol-1 webbook
Hfg(0K) enthalpy of formation   2.00 kJ mol-1 webbook
Entropy (298.15K) entropy 389.30 1.30 J K-1 mol-1 webbook
Heat Capacity (298.15K) heat capacity 187.20 0.60 J K-1 mol-1 webbook
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference

Calculated vibrational frequencies for (CH3)3CC(CH3)3 (tetramethylbutane).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment

Calculated rotational constants for (CH3)3CC(CH3)3 (tetramethylbutane).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of tetramethylbutane

Point Group C2


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4

Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for (CH3)3CC(CH3)3 (tetramethylbutane).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 18
C-C 7

Connectivity
Atom 1 Atom 2
C1 C2
C1 C3
C1 C4
C1 C5
C2 C6
C2 C7
C2 C8
C3 H9
C3 H10
C3 H11
C4 H12
C4 H13
C4 H14
C5 H15
C5 H16
C5 H17
C6 H18
C6 H19
C6 H20
C7 H21
C7 H22
C7 H23
C8 H24
C8 H25
C8 H26
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A1
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 1A1 D3d False           D3d 0 1
1 2 1A1 D3 True           C2 1 3
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for (CH3)3CC(CH3)3 (tetramethylbutane).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 1A1 D3d False       D3d 0 1
1 2 1A1 D3 True       C2 1 3

Calculated electric quadrupole moments for (CH3)3CC(CH3)3 (tetramethylbutane).
Electric dipole polarizability (Å3) polarizability
alpha unc. Reference
15.610   1998Gus/Rui:163

Calculated electric dipole polarizability for (CH3)3CC(CH3)3 (tetramethylbutane).

References
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squib reference DOI
1998Gus/Rui:163 M Gussoni, R Rui, G Zerbi "Electronic and relaxation contribution to linear molecular polarizability. An analysis of the experimental values" J. Mol. Struct. 447 (1998) 163-215 10.1016/S0022-2860(97)00292-5
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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