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 CH2Br2 (dibromomethane)

using model chemistry: mPW1PW91/daug-cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at mPW1PW91/daug-cc-pVTZ
 hartrees
Energy at 0K-5188.094886
Energy at 298.15K 
HF Energy-5188.094886
Nuclear repulsion energy352.400142
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 mPW1PW91/daug-cc-pVTZ
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 3152 3152 0.93 94.80 0.04 0.08
2 A1 1438 1438 0.04 9.97 0.51 0.68
3 A1 597 597 3.49 17.87 0.06 0.12
4 A1 172 172 0.09 3.41 0.33 0.49
5 A2 1124 1124 0.00 0.89 0.75 0.86
6 B1 3237 3237 3.14 43.39 0.75 0.86
7 B1 822 822 3.74 0.29 0.75 0.86
8 B2 1221 1221 59.29 0.27 0.75 0.86
9 B2 666 666 94.17 3.86 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6214.5 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6214.5 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 mPW1PW91/daug-cc-pVTZ
ABC
0.89147 0.04087 0.03938

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/daug-cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.927
H2 -0.897 0.000 1.532
H3 0.897 0.000 1.532
Br4 0.000 1.613 -0.123
Br5 0.000 -1.613 -0.123

Atom - Atom Distances (Å)
  C1 H2 H3 Br4 Br5
C11.08131.08131.92531.9253
H21.08131.79342.47912.4791
H31.08131.79342.47912.4791
Br41.92532.47912.47913.2266
Br51.92532.47912.47913.2266

picture of dibromomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 H3 112.046 H2 C1 Br4 107.758
H2 C1 Br5 107.758 H3 C1 Br4 107.758
H3 C1 Br5 107.758 Br4 C1 Br5 113.849
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/daug-cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.044      
2 H 0.432      
3 H 0.432      
4 Br -0.410      
5 Br -0.410      


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 1.483 1.483
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -43.071 0.000 0.000
y 0.000 -44.614 0.000
z 0.000 0.000 -40.689
Traceless
 xyz
x -0.420 0.000 0.000
y 0.000 -2.734 0.000
z 0.000 0.000 3.153
Polar
3z2-r26.307
x2-y21.542
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.908 0.000 0.000
y 0.000 11.323 0.000
z 0.000 0.000 7.560


<r2> (average value of r2) Å2
<r2> 221.440
(<r2>)1/2 14.881