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 CH2Br (bromomethyl radical)

using model chemistry: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
1 2 no C2V 2A1

Conformer 1 (CS)

Jump to S1C2
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-2609.343182
Energy at 298.15K-2609.346973
HF Energy-2609.053535
Nuclear repulsion energy81.645722
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 MP2/6-31G(2df,p)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3261 3080 2.97      
2 A' 1435 1356 16.96      
3 A' 767 725 16.49      
4 A' 234 221 58.33      
5 A" 3414 3224 1.63      
6 A" 969 915 0.78      

Unscaled Zero Point Vibrational Energy (zpe) 5040.0 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 4760.3 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 MP2/6-31G(2df,p)
ABC
9.31278 0.38752 0.37231

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.005 1.465 0.000
Br2 -0.005 -0.364 0.000
H3 0.097 1.972 0.943
H4 0.097 1.972 -0.943

Atom - Atom Distances (Å)
  C1 Br2 H3 H4
C11.82851.07611.0761
Br21.82852.52152.5215
H31.07612.52151.8867
H41.07612.52151.8867

picture of bromomethyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Br2 C1 H3 118.147 Br2 C1 H4 118.147
H3 C1 H4 122.482
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C2V)

Jump to S1C1
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-2609.343166
Energy at 298.15K 
HF Energy-2609.053446
Nuclear repulsion energy81.714410
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 MP2/6-31G(2df,p)
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 3267 3085 2.35 91.98 0.11 0.20
2 A1 1435 1355 17.28 2.22 0.75 0.86
3 A1 770 728 15.79 6.23 0.11 0.20
4 B1 167i 158i 62.93 0.25 0.75 0.86
5 B2 3421 3231 2.08 48.55 0.75 0.86
6 B2 966 913 0.81 1.92 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4846.1 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 4577.1 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 MP2/6-31G(2df,p)
ABC
9.35519 0.38823 0.37276

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.463
Br2 0.000 0.000 0.364
H3 0.000 0.946 -1.975
H4 0.000 -0.946 -1.975

Atom - Atom Distances (Å)
  C1 Br2 H3 H4
C11.82631.07551.0755
Br21.82632.52272.5227
H31.07552.52271.8910
H41.07552.52271.8910

picture of bromomethyl radical state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Br2 C1 H3 118.460 Br2 C1 H4 118.460
H3 C1 H4 123.080
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability