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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: MP2=FULL/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP2=FULL/STO-3G
 hartrees
Energy at 0K-13740.026954
Energy at 298.15K 
HF Energy-13739.945633
Nuclear repulsion energy607.446748
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 MP2=FULL/STO-3G
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 3389 3012 0.52 37.26 0.13 0.22
2 A1 1675 1489 0.76 17.61 0.72 0.84
3 A1 560 498 5.00 12.28 0.14 0.25
4 A1 139 124 0.34 4.18 0.53 0.70
5 A2 1271 1130 0.00 16.05 0.75 0.86
6 B1 3507 3117 0.37 31.33 0.75 0.86
7 B1 823 732 0.05 2.30 0.75 0.86
8 B2 1343 1194 97.60 1.04 0.75 0.86
9 B2 745 662 38.82 11.52 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6725.8 cm-1
Scaled (by 0.8889) Zero Point Vibrational Energy (zpe) 5978.5 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 MP2=FULL/STO-3G
ABC
0.77917 0.01954 0.01913

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/STO-3G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.022
I2 0.000 1.842 -0.089
I3 0.000 -1.842 -0.089
H4 -0.893 0.000 1.676
H5 0.893 0.000 1.676

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.15122.15121.10671.1067
I22.15123.68432.70312.7031
I32.15123.68432.70312.7031
H41.10672.70312.70311.7852
H51.10672.70312.70311.7852

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 117.809 I2 C1 H4 107.779
I2 C1 H5 107.779 I3 C1 H4 107.779
I3 C1 H5 107.779 H4 C1 H5 107.513
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability