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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: CID/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CID/3-21G*
 hartrees
Energy at 0K-13814.927626
Energy at 298.15K 
HF Energy-13814.622373
Nuclear repulsion energy606.822345
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 CID/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 3207 2985 0.15      
2 A1 1524 1418 0.03      
3 A1 510 474 0.74      
4 A1 121 112 0.01      
5 A2 1136 1057 0.00      
6 B1 3291 3062 3.68      
7 B1 767 713 9.26      
8 B2 1233 1147 98.18      
9 B2 629 585 32.08      

Unscaled Zero Point Vibrational Energy (zpe) 6208.5 cm-1
Scaled (by 0.9305) Zero Point Vibrational Energy (zpe) 5777.0 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 CID/3-21G*
ABC
0.71304 0.01970 0.01924

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.088
I2 0.000 1.835 -0.094
I3 0.000 -1.835 -0.094
H4 -0.898 0.000 1.696
H5 0.898 0.000 1.696

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.18202.18201.08411.0841
I22.18203.66922.71532.7153
I32.18203.66922.71532.7153
H41.08412.71532.71531.7952
H51.08412.71532.71531.7952

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 114.445 I2 C1 H4 107.673
I2 C1 H5 107.673 I3 C1 H4 107.673
I3 C1 H5 107.673 H4 C1 H5 111.782
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability