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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: MP2=FULL/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 MP2=FULL/3-21G*
 hartrees
Energy at 0K-13814.981690
Energy at 298.15K 
HF Energy-13814.622062
Nuclear repulsion energy605.859034
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/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 3167 3002 0.01 70.34 0.08 0.15
2 A1 1501 1423 0.27 19.75 0.68 0.81
3 A1 499 473 1.00 13.66 0.09 0.16
4 A1 118 112 0.01 4.33 0.41 0.58
5 A2 1110 1052 0.00 6.38 0.75 0.86
6 B1 3256 3086 4.55 47.69 0.75 0.86
7 B1 756 717 9.05 2.00 0.75 0.86
8 B2 1202 1140 98.29 0.02 0.75 0.86
9 B2 606 575 40.85 8.38 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6107.3 cm-1
Scaled (by 0.948) Zero Point Vibrational Energy (zpe) 5789.7 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/3-21G*
ABC
0.69983 0.01967 0.01921

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/3-21G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.100
I2 0.000 1.836 -0.094
I3 0.000 -1.836 -0.094
H4 -0.904 0.000 1.704
H5 0.904 0.000 1.704

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.19012.19011.08751.0875
I22.19013.67142.72452.7245
I32.19013.67142.72452.7245
H41.08752.72452.72451.8082
H51.08752.72452.72451.8082

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 113.894 I2 C1 H4 107.645
I2 C1 H5 107.645 I3 C1 H4 107.645
I3 C1 H5 107.645 H4 C1 H5 112.473
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability