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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: MP4/Def2TZVPP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP4/Def2TZVPP
 hartrees
Energy at 0K-633.519440
Energy at 298.15K 
HF Energy-632.356343
Nuclear repulsion energy193.029072
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 MP4/Def2TZVPP
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 3126 3126        
2 A1 1412 1412        
3 A1 502 502        
4 A1 118 118        
5 A2 1058 1058        
6 B1 3216 3216        
7 B1 726 726        
8 B2 1138 1138        
9 B2 611 611        

Unscaled Zero Point Vibrational Energy (zpe) 5953.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 5953.6 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 MP4/Def2TZVPP
ABC
0.74965 0.02067 0.02019

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/Def2TZVPP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.055
I2 0.000 1.791 -0.091
I3 0.000 -1.791 -0.091
H4 -0.897 0.000 1.664
H5 0.897 0.000 1.664

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.12642.12641.08351.0835
I22.12643.58162.66292.6629
I32.12643.58162.66292.6629
H41.08352.66292.66291.7932
H51.08352.66292.66291.7932

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 114.740 I2 C1 H4 107.624
I2 C1 H5 107.624 I3 C1 H4 107.624
I3 C1 H5 107.624 H4 C1 H5 111.681
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability