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: mPW1PW91/3-21G

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 mPW1PW91/3-21G
 hartrees
Energy at 0K-2600.979006
Energy at 298.15K-2600.982747
HF Energy-2600.979006
Nuclear repulsion energy79.008605
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 mPW1PW91/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3226 3079 3.03      
2 A' 1406 1342 24.71      
3 A' 677 647 22.22      
4 A' 234 223 142.35      
5 A" 3393 3239 0.01      
6 A" 917 876 2.68      

Unscaled Zero Point Vibrational Energy (zpe) 4926.4 cm-1
Scaled (by 0.9546) Zero Point Vibrational Energy (zpe) 4702.7 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 mPW1PW91/3-21G
ABC
9.14123 0.36107 0.34735

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.000 1.524 0.000
Br2 -0.000 -0.377 0.000
H3 0.000 2.019 0.957
H4 0.000 2.019 -0.957

Atom - Atom Distances (Å)
  C1 Br2 H3 H4
C11.90031.07731.0773
Br21.90032.57982.5798
H31.07732.57981.9130
H41.07732.57981.9130

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 117.389 Br2 C1 H4 117.389
H3 C1 H4 125.223
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.681      
2 Br 0.145      
3 H 0.268      
4 H 0.268      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.992 0.000 0.992
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.145 0.000 0.000
y 0.000 -21.680 0.000
z 0.000 0.000 -23.947
Traceless
 xyz
x -3.332 0.000 0.000
y 0.000 3.366 0.000
z 0.000 0.000 -0.034
Polar
3z2-r2-0.068
x2-y2-4.466
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.044 0.000 0.000
y 0.000 5.078 0.000
z 0.000 0.000 1.944


<r2> (average value of r2) Å2
<r2> 43.821
(<r2>)1/2 6.620

Conformer 2 (C2V)

Jump to S1C1
Energy calculated at mPW1PW91/3-21G
 hartrees
Energy at 0K-2600.978998
Energy at 298.15K 
HF Energy-2600.978998
Nuclear repulsion energy78.989489
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 mPW1PW91/3-21G
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 3224 3078 3.03 100.84 0.12 0.21
2 A1 1406 1342 24.83 1.12 0.70 0.83
3 A1 680 649 22.21 8.88 0.37 0.54
4 B1 236 225 142.35 0.21 0.75 0.86
5 B2 3392 3238 0.01 52.00 0.75 0.86
6 B2 917 875 2.69 8.22 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4927.3 cm-1
Scaled (by 0.9546) Zero Point Vibrational Energy (zpe) 4703.6 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 mPW1PW91/3-21G
ABC
9.13980 0.36088 0.34717

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.524
Br2 0.000 0.000 0.377
H3 0.000 0.957 -2.020
H4 0.000 -0.957 -2.020

Atom - Atom Distances (Å)
  C1 Br2 H3 H4
C11.90091.07721.0772
Br21.90092.58012.5801
H31.07722.58011.9132
H41.07722.58011.9132

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 117.377 Br2 C1 H4 117.377
H3 C1 H4 125.246
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.681      
2 Br 0.145      
3 H 0.268      
4 H 0.268      


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 -0.994 0.994
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.146 0.000 0.000
y 0.000 -23.947 0.000
z 0.000 0.000 -21.677
Traceless
 xyz
x -3.335 0.000 0.000
y 0.000 -0.035 0.000
z 0.000 0.000 3.370
Polar
3z2-r26.739
x2-y2-2.200
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.044 0.000 0.000
y 0.000 1.944 0.000
z 0.000 0.000 5.080


<r2> (average value of r2) Å2
<r2> 43.834
(<r2>)1/2 6.621