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All results from a given calculation for C2Br4 (tetrabromoethene)

using model chemistry: CCD/cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1AG
Energy calculated at CCD/cc-pVDZ
 hartrees
Energy at 0K-10366.028141
Energy at 298.15K 
HF Energy-10365.215909
Nuclear repulsion energy1470.628214
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 CCD/cc-pVDZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Ag 1628 1557 12.02      
2 Ag 274 262 78.30      
3 Ag 150 144 78.89      
4 Au 57 55 78.92      
5 B1u 651 623 13.53      
6 B1u 194 186 58.41      
7 B2g 491 470 12.12      
8 B2u 795 760 13.07      
9 B2u 122 117 68.84      
10 B3g 925 885 12.28      
11 B3g 217 207 70.87      
12 B3u 257 245 12.76      

Unscaled Zero Point Vibrational Energy (zpe) 2879.7 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 2755.0 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at CCD/cc-pVDZ
ABC
0.02109 0.01822 0.00977

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/cc-pVDZ

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.677
C2 0.000 0.000 -0.677
Br3 0.000 1.591 1.702
Br4 0.000 -1.591 1.702
Br5 0.000 -1.591 -1.702
Br6 0.000 1.591 -1.702

Atom - Atom Distances (Å)
  C1 C2 Br3 Br4 Br5 Br6
C11.35381.89301.89302.86212.8621
C21.35382.86212.86211.89301.8930
Br31.89302.86213.18294.66013.4039
Br41.89302.86213.18293.40394.6601
Br52.86211.89304.66013.40393.1829
Br62.86211.89303.40394.66013.1829

picture of tetrabromoethene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 Br5 122.786 C1 C2 Br6 122.786
C2 C1 Br3 122.786 C2 C1 Br4 122.786
Br3 C1 Br4 114.429 Br5 C2 Br6 114.429
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability