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All results from a given calculation for CHBr2 (dibromomethyl radical)

using model chemistry: CISD/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 CISD/3-21G*
 hartrees
Energy at 0K-5159.039296
Energy at 298.15K 
HF Energy-5158.719501
Nuclear repulsion energy335.549760
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 CISD/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
A' 3284 3069 1.04      
A' 640 598 10.24      
A' 447 417 24.96      
A' 185 173 0.15      
A" 1261 1178 64.36      
A" 808 755 90.19      

Unscaled Zero Point Vibrational Energy (zpe) 3312.5 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 3095.2 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 CISD/3-21G*
ABC
1.21968 0.04063 0.03935

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.006 0.854 0.000
H2 -0.467 1.825 0.000
Br3 0.006 -0.099 1.621
Br4 0.006 -0.099 -1.621

Atom - Atom Distances (Å)
  C1 H2 Br3 Br4
C11.07961.88071.8807
H21.07962.56002.5600
Br31.88072.56003.2418
Br41.88072.56003.2418

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 117.116 H2 C1 Br4 117.116
Br3 C1 Br4 119.058
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability