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All results from a given calculation for CH2Br2 (dibromomethane)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CBS-Q
 hartrees
Energy at 0K-5184.966835
Energy at 298.15K-5184.962049
HF Energy-5178.971151
Nuclear repulsion energy353.852066
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 CBS-Q
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 3325 3325 6.12 90.59 0.11 0.20
2 A1 1585 1585 0.90 14.00 0.72 0.84
3 A1 636 636 8.19 21.50 0.11 0.19
4 A1 190 190 0.13 4.57 0.48 0.64
5 A2 1240 1240 0.00 8.97 0.75 0.86
6 B1 3418 3418 0.20 63.37 0.75 0.86
7 B1 892 892 4.01 2.80 0.75 0.86
8 B2 1359 1359 99.17 0.03 0.75 0.86
9 B2 730 730 97.85 13.63 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6686.8 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6686.8 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 CBS-Q
ABC
0.87539 0.04134 0.03978

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.933
H2 -0.889 0.000 1.540
H3 0.889 0.000 1.540
Br4 0.000 1.604 -0.124
Br5 0.000 -1.604 -0.124

Atom - Atom Distances (Å)
  C1 H2 H3 Br4 Br5
C11.07621.07621.92121.9212
H21.07621.77802.47622.4762
H31.07621.77802.47622.4762
Br41.92122.47622.47623.2083
Br51.92122.47622.47623.2083

picture of dibromomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 H3 111.393 H2 C1 Br4 108.068
H2 C1 Br5 108.068 H3 C1 Br4 108.068
H3 C1 Br5 108.068 Br4 C1 Br5 113.224
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability