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

using model chemistry: CISD/6-31G*

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/6-31G*
 hartrees
Energy at 0K-5178.491603
Energy at 298.15K 
HF Energy-5178.170565
Nuclear repulsion energy337.492764
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/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
A' 3327 3081 1.25      
A' 641 594 11.39      
A' 493 456 18.15      
A' 194 180 0.06      
A" 1244 1152 65.56      
A" 788 729 102.56      

Unscaled Zero Point Vibrational Energy (zpe) 3343.8 cm-1
Scaled (by 0.9258) Zero Point Vibrational Energy (zpe) 3095.7 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 CISD/6-31G*
ABC
1.22998 0.04113 0.03983

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.007 0.852 0.000
H2 -0.514 1.797 0.000
Br3 0.007 -0.099 1.611
Br4 0.007 -0.099 -1.611

Atom - Atom Distances (Å)
  C1 H2 Br3 Br4
C11.07911.87081.8708
H21.07912.54202.5420
Br31.87082.54203.2223
Br41.87082.54203.2223

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 116.440 H2 C1 Br4 116.440
Br3 C1 Br4 118.904
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability