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All results from a given calculation for CH2Br2 (dibromomethane)

using model chemistry: mPW1PW91/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at mPW1PW91/6-31G*
 hartrees
Energy at 0K-5183.018052
Energy at 298.15K 
HF Energy-5183.018052
Nuclear repulsion energy352.319659
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 mPW1PW91/6-31G*
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 3187 3023 2.19      
2 A1 1472 1396 0.10      
3 A1 598 567 4.85      
4 A1 179 169 0.09      
5 A2 1143 1084 0.00      
6 B1 3281 3111 0.97      
7 B1 820 778 5.30      
8 B2 1244 1180 70.67      
9 B2 657 623 98.33      

Unscaled Zero Point Vibrational Energy (zpe) 6290.1 cm-1
Scaled (by 0.9483) Zero Point Vibrational Energy (zpe) 5964.9 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 mPW1PW91/6-31G*
ABC
0.87637 0.04098 0.03945

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.937
H2 -0.900 0.000 1.541
H3 0.900 0.000 1.541
Br4 0.000 1.611 -0.124
Br5 0.000 -1.611 -0.124

Atom - Atom Distances (Å)
  C1 H2 H3 Br4 Br5
C11.08441.08441.92931.9293
H21.08441.80082.48612.4861
H31.08441.80082.48612.4861
Br41.92932.48612.48613.2223
Br51.92932.48612.48613.2223

picture of dibromomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 H3 112.266 H2 C1 Br4 107.852
H2 C1 Br5 107.852 H3 C1 Br4 107.852
H3 C1 Br5 107.852 Br4 C1 Br5 113.252
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.387      
2 H 0.259      
3 H 0.259      
4 Br -0.066      
5 Br -0.066      


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 1.562 1.562
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -42.558 0.000 0.000
y 0.000 -43.794 0.000
z 0.000 0.000 -39.978
Traceless
 xyz
x -0.672 0.000 0.000
y 0.000 -2.526 0.000
z 0.000 0.000 3.197
Polar
3z2-r26.395
x2-y21.236
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.568 0.000 0.000
y 0.000 8.985 0.000
z 0.000 0.000 5.385


<r2> (average value of r2) Å2
<r2> 220.733
(<r2>)1/2 14.857