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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: MP4/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP4/3-21G
 hartrees
Energy at 0K-13814.670182
Energy at 298.15K 
HF Energy-13814.486958
Nuclear repulsion energy594.714033
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 MP4/3-21G
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 3130 3035        
2 A1 1490 1445        
3 A1 459 445        
4 A1 117 113        
5 A2 1105 1072        
6 B1 3211 3114        
7 B1 742 720        
8 B2 1197 1161        
9 B2 580 563        

Unscaled Zero Point Vibrational Energy (zpe) 6015.3 cm-1
Scaled (by 0.9698) Zero Point Vibrational Energy (zpe) 5833.6 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 MP4/3-21G
ABC
0.72259 0.01879 0.01838

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/3-21G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.077
I2 0.000 1.879 -0.093
I3 0.000 -1.879 -0.093
H4 -0.900 0.000 1.693
H5 0.900 0.000 1.693

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.21322.21321.09021.0902
I22.21323.75712.74362.7436
I32.21323.75712.74362.7436
H41.09022.74362.74361.7995
H51.09022.74362.74361.7995

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 116.161 I2 C1 H4 107.371
I2 C1 H5 107.371 I3 C1 H4 107.371
I3 C1 H5 107.371 H4 C1 H5 111.239
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability