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: HF/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 HF/3-21G*
 hartrees
Energy at 0K-2599.032959
Energy at 298.15K-2599.036707
HF Energy-2599.032959
Nuclear repulsion energy79.925676
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 HF/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' 3324 3000 8.13      
2 A' 1514 1366 38.91      
3 A' 721 650 17.95      
4 A' 212 191 77.23      
5 A" 3482 3142 0.03      
6 A" 1003 905 1.76      

Unscaled Zero Point Vibrational Energy (zpe) 5127.4 cm-1
Scaled (by 0.9026) Zero Point Vibrational Energy (zpe) 4628.0 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 HF/3-21G*
ABC
9.35217 0.36950 0.35565

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.004 1.505 0.000
Br2 -0.004 -0.372 0.000
H3 0.086 2.000 0.942
H4 0.086 2.000 -0.942

Atom - Atom Distances (Å)
  C1 Br2 H3 H4
C11.87721.06831.0683
Br21.87722.55432.5543
H31.06832.55431.8846
H41.06832.55431.8846

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 117.617 Br2 C1 H4 117.617
H3 C1 H4 123.787
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.422      
2 Br -0.067      
3 H 0.245      
4 H 0.245      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.168 1.342 0.000 1.353
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.211 0.358 0.000
y 0.358 -20.973 0.000
z 0.000 0.000 -24.288
Traceless
 xyz
x -3.581 0.358 0.000
y 0.358 4.277 0.000
z 0.000 0.000 -0.696
Polar
3z2-r2-1.392
x2-y2-5.239
xy0.358
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.908 0.057 0.000
y 0.057 4.818 0.000
z 0.000 0.000 2.752


<r2> (average value of r2) Å2
<r2> 43.112
(<r2>)1/2 6.566

Conformer 2 (C2V)

Jump to S1C1
Energy calculated at HF/3-21G*
 hartrees
Energy at 0K-2599.032949
Energy at 298.15K 
HF Energy-2599.032949
Nuclear repulsion energy79.946253
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 HF/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 3327 3003 7.52 103.36 0.12 0.21
2 A1 1512 1364 40.16 2.18 0.68 0.81
3 A1 721 651 17.28 12.36 0.28 0.44
4 B1 150i 136i 83.32 1.80 0.75 0.86
5 B2 3486 3147 0.00 55.48 0.75 0.86
6 B2 999 902 1.83 4.62 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4947.2 cm-1
Scaled (by 0.9026) Zero Point Vibrational Energy (zpe) 4465.3 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 HF/3-21G*
ABC
9.38626 0.36971 0.35570

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.504
Br2 0.000 0.000 0.372
H3 0.000 0.944 -2.003
H4 0.000 -0.944 -2.003

Atom - Atom Distances (Å)
  C1 Br2 H3 H4
C11.87621.06791.0679
Br21.87622.55632.5563
H31.06792.55631.8879
H41.06792.55631.8879

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 117.884 Br2 C1 H4 117.884
H3 C1 H4 124.232
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.425      
2 Br -0.066      
3 H 0.246      
4 H 0.246      


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 -1.344 1.344
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.232 0.000 0.000
y 0.000 -24.268 0.000
z 0.000 0.000 -20.939
Traceless
 xyz
x -3.629 0.000 0.000
y 0.000 -0.683 0.000
z 0.000 0.000 4.311
Polar
3z2-r28.623
x2-y2-1.964
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.899 0.000 0.000
y 0.000 2.749 0.000
z 0.000 0.000 4.812


<r2> (average value of r2) Å2
<r2> 43.104
(<r2>)1/2 6.565