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All results from a given calculation for CH2Br2 (dibromomethane)

using model chemistry: QCISD/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 QCISD/3-21G*
 hartrees
Energy at 0K-5159.726853
Energy at 298.15K 
HF Energy-5159.344423
Nuclear repulsion energy348.991622
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 QCISD/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 3126 3005 3.55      
2 A1 1515 1456 0.18      
3 A1 593 570 4.61      
4 A1 171 164 0.12      
5 A2 1157 1112 0.00      
6 B1 3205 3080 0.00      
7 B1 840 807 5.38      
8 B2 1266 1216 55.48      
9 B2 671 645 60.12      

Unscaled Zero Point Vibrational Energy (zpe) 6271.9 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 6027.9 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 QCISD/3-21G*
ABC
0.82795 0.04048 0.03889

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.970
H2 -0.905 0.000 1.576
H3 0.905 0.000 1.576
Br4 0.000 1.621 -0.128
Br5 0.000 -1.621 -0.128

Atom - Atom Distances (Å)
  C1 H2 H3 Br4 Br5
C11.08971.08971.95771.9577
H21.08971.81082.52022.5202
H31.08971.81082.52022.5202
Br41.95772.52022.52023.2420
Br51.95772.52022.52023.2420

picture of dibromomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 H3 112.379 H2 C1 Br4 108.180
H2 C1 Br5 108.180 H3 C1 Br4 108.180
H3 C1 Br5 108.180 Br4 C1 Br5 111.790
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability