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Experimental data for CHBr3 (bromoform)

22 02 02 11 45
Other names
Methenyl tribromide; Methane, tribromo-; Bromoforme; Tribromomethane; Tribromometan; bromoform;
INChI INChIKey SMILES IUPAC name
InChI=1S/CHBr3/c2-1(3)4/h1H DIKBFYAXUHHXCS-UHFFFAOYSA-N BrC(Br)Br bromoform
State Conformation
1A1 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 55.10 4.90 kJ mol-1 2008Shu/Zha:10533-10538
Hfg(0K) enthalpy of formation 81.00 4.90 kJ mol-1 2008Shu/Zha:10533-10538
Entropy (298.15K) entropy 330.67   J K-1 mol-1 Gurvich
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 16.10   kJ mol-1 2008Shu/Zha:10533-10538
Heat Capacity (298.15K) heat capacity 70.99   J K-1 mol-1 Gurvich
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
1 A1 3042   webbook       CH stretch
2 A1 541   webbook       CBr3 s-str
3 A1 222   webbook       CBr3 s-deform
4 E 1149   webbook       CH2 bend
5 E 669   webbook       CBr3 d-stretch
6 E 155   webbook       CBr3 d-deform

vibrational zero-point energy: 3875.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CHBr3 (bromoform).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
  0.04162   1952Wil/Cox:1524

Calculated rotational constants for CHBr3 (bromoform).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of bromoform

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
rCBr 1.924 0.005 1 3 1987Kuchitsu(II/15) rg
rCH 1.110 0.050 1 2 1987Kuchitsu(II/15)
aBrCBr 111.7 0.4 3 1 4 1987Kuchitsu(II/15)
aHCBr 107.2 0.4 2 1 3 1987Kuchitsu(II/15)

Cartesians
Atom x (Å) y (Å) z (Å)
C1 0.0000 0.0000 0.5235
H2 0.0000 0.0000 1.6335
Br3 0.0000 1.8380 -0.0455
Br4 1.5917 -0.9190 -0.0455
Br5 -1.5917 -0.9190 -0.0455

Atom - Atom Distances bond lengths
Distances in Å
  C1 H2 Br3 Br4 Br5
C1   1.11001.92401.92401.9240
H2 1.1100   2.48942.48942.4894
Br3 1.92402.4894   3.18343.1834
Br4 1.92402.48943.1834   3.1834
Br5 1.92402.48943.18343.1834  

Calculated geometries for CHBr3 (bromoform).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
H2 C1 Br3 107.200 H2 C1 Br4 107.200
H2 C1 Br5 107.200 Br3 C1 Br4 111.644
Br3 C1 Br5 111.644 Br4 C1 Br5 111.644

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 1
C-Br 3

Connectivity
Atom 1 Atom 2
C1 H2
C1 Br3
C1 Br4
C1 Br5
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A1

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
10.500 0.020     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 1A1 C3v True       0.990 NSRDS-NBS10 DT 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 CHBr3 (bromoform).
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 C3v True       C3v 1 1

Calculated electric quadrupole moments for CHBr3 (bromoform).
Electric dipole polarizability (Å3) polarizability
alpha unc. Reference
11.840   1998Gus/Rui:163

Calculated electric dipole polarizability for CHBr3 (bromoform).

References
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squib reference DOI
1952Wil/Cox:1524 Q Williams, JT Cox, W Gordy "MOLECULAR STRUCTURE OF BROMOFORM" J. Chem. Phys. 20(10) 1524-1525, 1952 10.1063/1.1700208
1987Kuchitsu(II/15) Kuchitsu (ed.), Landolt-Bornstein: Group II: Atomic and Molecular Physics Volume 15: Structure Data of Free Polyatomic Molecules. Springer-Verlag, Berlin, 1987.  
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
2008Shu/Zha:10533-10538 NS Shuman, LY Zhao, M Boles, T Baer, B Sztaray "Heats of Formation of HCCl3, HCCl2Br, HCClBr2, HCBr3, and Their Fragment Ions Studied by Threshold Photoelectron Photoion Coincidence" J. Phys. Chem. A 2008, 112, 10533–10538 10.1021/jp8056459
Gurvich Gurvich, L.V.; Veyts, I. V.; Alcock, C. B., Thermodynamic Properties of Individual Substances, Fouth Edition, Hemisphere Pub. Co., New York, 1989  
NSRDS-NBS10 R. D. Nelson Jr., D. R. Lide, A. A. Maryott "Selected Values of electric dipole moments for molecules in the gas phase" NSRDS-NBS10, 1967 10.6028/NBS.NSRDS.10
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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