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All results from a given calculation for CHBr2 (dibromomethyl 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'
Energy calculated at mPW1PW91/3-21G*
 hartrees
Energy at 0K-5162.823978
Energy at 298.15K 
HF Energy-5162.823978
Nuclear repulsion energy338.435257
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' 3264 3100 0.66 92.12 0.28 0.44
2 A' 633 601 5.60 5.89 0.22 0.36
3 A' 294 280 50.10 6.09 0.15 0.26
4 A' 184 175 1.02 3.10 0.58 0.74
5 A" 1218 1157 55.28 2.81 0.75 0.86
6 A" 820 779 110.63 1.33 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 3206.9 cm-1
Scaled (by 0.9496) Zero Point Vibrational Energy (zpe) 3045.3 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 mPW1PW91/3-21G*
ABC
1.27207 0.04120 0.03993

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 0.005 0.829 0.000
H2 -0.353 1.849 0.000
Br3 0.005 -0.097 1.610
Br4 0.005 -0.097 -1.610

Atom - Atom Distances (Å)
  C1 H2 Br3 Br4
C11.08031.85761.8576
H21.08032.55092.5509
Br31.85762.55093.2198
Br41.85762.55093.2198

picture of dibromomethyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 Br3 118.082 H2 C1 Br4 118.082
Br3 C1 Br4 120.139
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 -0.335      
2 H 0.278      
3 Br 0.028      
4 Br 0.028      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.407 0.589 0.000 0.716
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -42.837 -0.811 0.000
y -0.811 -39.564 0.000
z 0.000 0.000 -39.728
Traceless
 xyz
x -3.191 -0.811 0.000
y -0.811 1.719 0.000
z 0.000 0.000 1.472
Polar
3z2-r22.944
x2-y2-3.273
xy-0.811
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.251 -0.150 0.000
y -0.150 4.666 0.000
z 0.000 0.000 8.950


<r2> (average value of r2) Å2
<r2> 215.185
(<r2>)1/2 14.669