return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CHBrCHBr (Ethene, 1,2-dibromo-, (Z)-)

using model chemistry: HF/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 1A1
Energy calculated at HF/3-21G*
 hartrees
Energy at 0K-5196.978189
Energy at 298.15K-5196.986036
HF Energy-5196.978189
Nuclear repulsion energy430.988407
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 HF/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3415 3083 1.21      
2 A1 1793 1618 24.67      
3 A1 1324 1195 2.65      
4 A1 631 569 9.18      
5 A1 121 109 0.04      
6 A2 1109 1001 0.00      
7 A2 426 385 0.00      
8 B1 803 725 82.38      
9 B2 3388 3058 14.58      
10 B2 1451 1310 47.02      
11 B2 828 747 54.40      
12 B2 510 461 2.71      

Unscaled Zero Point Vibrational Energy (zpe) 7899.6 cm-1
Scaled (by 0.9026) Zero Point Vibrational Energy (zpe) 7130.2 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 HF/3-21G*
ABC
0.28220 0.03450 0.03074

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/3-21G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.655 1.264
C2 0.000 -0.655 1.264
Br3 0.000 1.736 -0.279
Br4 0.000 -1.736 -0.279
H5 0.000 1.211 2.178
H6 0.000 -1.211 2.178

Atom - Atom Distances (Å)
  C1 C2 Br3 Br4 H5 H6
C11.31051.88382.84561.06932.0778
C21.31052.84561.88382.07781.0693
Br31.88382.84563.47112.51223.8364
Br42.84561.88383.47113.83642.5122
H51.06932.07782.51223.83642.4219
H62.07781.06933.83642.51222.4219

picture of Ethene, 1,2-dibromo-, (Z)- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 Br4 124.993 C1 C2 H6 121.312
C2 C1 Br3 124.993 C2 C1 H5 121.312
Br3 C1 H5 113.695 Br4 C2 H6 113.695
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.269      
2 C -0.269      
3 Br -0.015      
4 Br -0.015      
5 H 0.284      
6 H 0.284      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 1.861 1.861
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -50.509 0.000 0.000
y 0.000 -48.175 0.000
z 0.000 0.000 -41.683
Traceless
 xyz
x -5.580 0.000 0.000
y 0.000 -2.079 0.000
z 0.000 0.000 7.659
Polar
3z2-r215.318
x2-y2-2.334
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.468 0.000 0.000
y 0.000 10.143 0.000
z 0.000 0.000 7.080


<r2> (average value of r2) Å2
<r2> 282.276
(<r2>)1/2 16.801