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All results from a given calculation for CH2Br2 (dibromomethane)

using model chemistry: PBEPBEultrafine/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBEPBEultrafine/3-21G
 hartrees
Energy at 0K-5161.802070
Energy at 298.15K 
HF Energy-5161.802070
Nuclear repulsion energy340.668744
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 PBEPBEultrafine/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 3091 3063 3.53 99.82 0.08 0.15
2 A1 1434 1421 0.33 19.10 0.74 0.85
3 A1 548 543 4.18 12.74 0.16 0.27
4 A1 163 161 0.06 9.06 0.54 0.70
5 A2 1109 1099 0.00 18.28 0.75 0.86
6 B1 3180 3151 0.12 60.61 0.75 0.86
7 B1 788 781 10.75 5.95 0.75 0.86
8 B2 1207 1196 52.72 4.15 0.75 0.86
9 B2 625 619 125.55 3.87 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6072.7 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 6017.4 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 PBEPBEultrafine/3-21G
ABC
0.85942 0.03797 0.03662

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.947
H2 -0.909 0.000 1.555
H3 0.909 0.000 1.555
Br4 0.000 1.674 -0.126
Br5 0.000 -1.674 -0.126

Atom - Atom Distances (Å)
  C1 H2 H3 Br4 Br5
C11.09401.09401.98801.9880
H21.09401.81852.54032.5403
H31.09401.81852.54032.5403
Br41.98802.54032.54033.3482
Br51.98802.54032.54033.3482

picture of dibromomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 H3 112.429 H2 C1 Br4 107.452
H2 C1 Br5 107.452 H3 C1 Br4 107.452
H3 C1 Br5 107.452 Br4 C1 Br5 114.727
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.853      
2 H 0.311      
3 H 0.311      
4 Br 0.116      
5 Br 0.116      


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 1.533 1.533
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -42.686 0.000 0.000
y 0.000 -43.899 0.000
z 0.000 0.000 -40.525
Traceless
 xyz
x -0.473 0.000 0.000
y 0.000 -2.293 0.000
z 0.000 0.000 2.767
Polar
3z2-r25.534
x2-y21.213
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.373 0.000 0.000
y 0.000 8.597 0.000
z 0.000 0.000 3.688


<r2> (average value of r2) Å2
<r2> 235.612
(<r2>)1/2 15.350