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: PBEPBE/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 PBEPBE/6-31G**
 hartrees
Energy at 0K-5181.849131
Energy at 298.15K 
HF Energy-5181.849131
Nuclear repulsion energy348.920089
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 PBEPBE/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 3079 3037 2.14      
2 A1 1397 1378 0.15      
3 A1 569 562 4.20      
4 A1 170 167 0.07      
5 A2 1081 1066 0.00      
6 B1 3174 3131 0.64      
7 B1 784 774 5.09      
8 B2 1174 1158 62.85      
9 B2 601 593 113.80      

Unscaled Zero Point Vibrational Energy (zpe) 6014.3 cm-1
Scaled (by 0.9863) Zero Point Vibrational Energy (zpe) 5931.9 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 PBEPBE/6-31G**
ABC
0.86529 0.04014 0.03866

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.943
H2 -0.911 0.000 1.549
H3 0.911 0.000 1.549
Br4 0.000 1.628 -0.125
Br5 0.000 -1.628 -0.125

Atom - Atom Distances (Å)
  C1 H2 H3 Br4 Br5
C11.09381.09381.94701.9470
H21.09381.82142.50622.5062
H31.09381.82142.50622.5062
Br41.94702.50622.50623.2557
Br51.94702.50622.50623.2557

picture of dibromomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 H3 112.733 H2 C1 Br4 107.688
H2 C1 Br5 107.688 H3 C1 Br4 107.688
H3 C1 Br5 107.688 Br4 C1 Br5 113.463
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.283      
2 H 0.207      
3 H 0.207      
4 Br -0.065      
5 Br -0.065      


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 1.493 1.493
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -42.615 0.000 0.000
y 0.000 -43.684 0.000
z 0.000 0.000 -40.087
Traceless
 xyz
x -0.729 0.000 0.000
y 0.000 -2.333 0.000
z 0.000 0.000 3.062
Polar
3z2-r26.125
x2-y21.069
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.666 0.000 0.000
y 0.000 9.426 0.000
z 0.000 0.000 5.503


<r2> (average value of r2) Å2
<r2> 224.694
(<r2>)1/2 14.990