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Experimental data for C(CH3)3 (Tert-butyl radical)

22 02 02 11 45
Other names
tert-Butyl radical; tert-C4H9; 2-Methylpropan-2-yl;
INChI INChIKey SMILES IUPAC name
InChI=1S/C4H9/c1-4(2)3/h1-3H3 IIVWHGMLFGNMOW-UHFFFAOYSA-N C[C](C)C 2-Methylpropan-2-yl
State Conformation
2A" C3V
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 51.46 1.70 kJ mol-1 1994Ber/Ell:2744
Hfg(0K) enthalpy of formation 75.70 1.70 kJ mol-1 1994Ber/Ell:2744
Entropy (298.15K) entropy 314.00 3.00 J K-1 mol-1 1997See/Sla:1709
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 18.23   kJ mol-1 TRC
Heat Capacity (298.15K) heat capacity 80.03   J K-1 mol-1 TRC
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 C(CH3)3 (Tert-butyl radical).
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 C(CH3)3 (Tert-butyl radical).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of Tert-butyl radical

Point Group C3v


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 C(CH3)3 (Tert-butyl radical).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 9
C-C 3

Connectivity
Atom 1 Atom 2
C1 C2
C1 C3
C1 C4
C2 H5
C2 H8
C2 H9
C3 H6
C3 H10
C3 H11
C4 H7
C4 H12
C4 H13
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 2   2A"

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
6.700 0.030 6.950 0.050 webbook

Electron Affinity (eV)
Electron Affinity unc. reference
-0.156 0.092 webbook
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 2A" C3v True           C3v 1 1
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 C(CH3)3 (Tert-butyl radical).
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 2A" C3v True       C3v 1 1

Calculated electric quadrupole moments for C(CH3)3 (Tert-butyl radical).

References
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squib reference DOI
1994Ber/Ell:2744 J Berkowitz, GB Ellison, D Gutman "Three Methods To Measure RH Bond Energies" J. Phys. Chem. 1994, 98, 2744-2765 10.1021/j100062a009
1997See/Sla:1709 JA Seetula, IR Slagle "Kinetics and thermochemistry of the R + HBR = RH + Br (R= n-C3H7, isoC3H7, n-C4H9, isoC4H9, sec-C4H9 or tert-C4H9" J. Chem. Soc. Faraday Trans. 1997, 93(9), 1709-1719 10.1039/a608224f
TRC Frenkel, M; Marsh, K.N.; Wilhoit, R.C.; Kabo, G.J.; Roganov, G.N.,Thermodynamics of Organic Compounds in the Gas State,Thermodynamics Research Center, College Station, TX, 1994  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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