return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for C2Br4 (tetrabromoethene)

using model chemistry: CCSD(T)=FULL/TZVP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1AG
Energy calculated at CCSD(T)=FULL/TZVP
 hartrees
Energy at 0K-10366.832856
Energy at 298.15K 
HF Energy-10365.336951
Nuclear repulsion energy1470.670607
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at CCSD(T)=FULL/TZVP
Rotational Constants (cm-1) from geometry optimized at CCSD(T)=FULL/TZVP
ABC
0.02097 0.01832 0.00978

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)=FULL/TZVP

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.673
C2 0.000 0.000 -0.673
Br3 0.000 1.596 1.697
Br4 0.000 -1.596 1.697
Br5 0.000 -1.596 -1.697
Br6 0.000 1.596 -1.697

Atom - Atom Distances (Å)
  C1 C2 Br3 Br4 Br5 Br6
C11.34521.89631.89632.85682.8568
C21.34522.85682.85681.89631.8963
Br31.89632.85683.19144.65883.3941
Br41.89632.85683.19143.39414.6588
Br52.85681.89634.65883.39413.1914
Br62.85681.89633.39414.65883.1914

picture of tetrabromoethene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 Br5 122.701 C1 C2 Br6 122.701
C2 C1 Br3 122.701 C2 C1 Br4 122.701
Br3 C1 Br4 114.598 Br5 C2 Br6 114.598
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability