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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-5183.021104
Energy at 298.15K 
HF Energy-5183.021104
Nuclear repulsion energy352.449602
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 3175 3021 1.97      
2 A1 1453 1383 0.06      
3 A1 598 569 4.87      
4 A1 179 170 0.09      
5 A2 1135 1080 0.00      
6 B1 3272 3114 1.29      
7 B1 815 776 5.06      
8 B2 1232 1172 66.74      
9 B2 657 625 97.70      

Unscaled Zero Point Vibrational Energy (zpe) 6258.2 cm-1
Scaled (by 0.9515) Zero Point Vibrational Energy (zpe) 5954.7 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
0.87697 0.04101 0.03948

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 -0.901 0.000 1.540
H3 0.901 0.000 1.540
Br4 0.000 1.611 -0.124
Br5 0.000 -1.611 -0.124

Atom - Atom Distances (Å)
  C1 H2 H3 Br4 Br5
C11.08421.08421.92871.9287
H21.08421.80192.48502.4850
H31.08421.80192.48502.4850
Br41.92872.48502.48503.2211
Br51.92872.48502.48503.2211

picture of dibromomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 H3 112.399 H2 C1 Br4 107.821
H2 C1 Br5 107.821 H3 C1 Br4 107.821
H3 C1 Br5 107.821 Br4 C1 Br5 113.246
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 -0.297      
2 H 0.221      
3 H 0.221      
4 Br -0.073      
5 Br -0.073      


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 1.563 1.563
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -42.550 0.000 0.000
y 0.000 -43.800 0.000
z 0.000 0.000 -39.971
Traceless
 xyz
x -0.664 0.000 0.000
y 0.000 -2.540 0.000
z 0.000 0.000 3.204
Polar
3z2-r26.408
x2-y21.250
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.588 0.000 0.000
y 0.000 9.006 0.000
z 0.000 0.000 5.412


<r2> (average value of r2) Å2
<r2> 220.584
(<r2>)1/2 14.852