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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: CISD/cc-pVTZ-PP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CISD/cc-pVTZ-PP
 hartrees
Energy at 0K-628.881402
Energy at 298.15K 
HF Energy-628.359618
Nuclear repulsion energy193.528034
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/cc-pVTZ-PP
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 3241 3241 0.17      
2 A1 1484 1484 0.13      
3 A1 528 528 0.18      
4 A1 126 126 0.02      
5 A2 1121 1121 0.00      
6 B1 3325 3325 4.02      
7 B1 761 761 6.78      
8 B2 1208 1208 102.70      
9 B2 659 659 26.66      

Unscaled Zero Point Vibrational Energy (zpe) 6225.3 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6225.3 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 CISD/cc-pVTZ-PP
ABC
0.76700 0.02069 0.02022

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/cc-pVTZ-PP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.042
I2 0.000 1.790 -0.090
I3 0.000 -1.790 -0.090
H4 -0.885 0.000 1.651
H5 0.885 0.000 1.651

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.11792.11791.07441.0744
I22.11793.57992.64922.6492
I32.11793.57992.64922.6492
H41.07442.64922.64921.7708
H51.07442.64922.64921.7708

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 115.372 I2 C1 H4 107.628
I2 C1 H5 107.628 I3 C1 H4 107.628
I3 C1 H5 107.628 H4 C1 H5 110.987
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability