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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: QCISD/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at QCISD/6-311G*
 hartrees
Energy at 0K-13873.224191
Energy at 298.15K 
HF Energy-13872.653829
Nuclear repulsion energy610.268630
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 QCISD/6-311G*
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 3144 3010 1.08      
2 A1 1456 1394 0.03      
3 A1 489 468 0.29      
4 A1 121 116 0.02      
5 A2 1109 1062 0.00      
6 B1 3226 3088 1.70      
7 B1 749 717 10.16      
8 B2 1203 1152 106.35      
9 B2 593 568 33.30      

Unscaled Zero Point Vibrational Energy (zpe) 6044.3 cm-1
Scaled (by 0.9574) Zero Point Vibrational Energy (zpe) 5786.8 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 QCISD/6-311G*
ABC
0.74805 0.01983 0.01939

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-311G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.055
I2 0.000 1.828 -0.091
I3 0.000 -1.828 -0.091
H4 -0.895 0.000 1.671
H5 0.895 0.000 1.671

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.15812.15811.08681.0868
I22.15813.65662.69282.6928
I32.15813.65662.69282.6928
H41.08682.69282.69281.7907
H51.08682.69282.69281.7907

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 115.812 I2 C1 H4 107.526
I2 C1 H5 107.526 I3 C1 H4 107.526
I3 C1 H5 107.526 H4 C1 H5 110.949
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability