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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-13814.666910
Energy at 298.15K 
HF Energy-13814.487533
Nuclear repulsion energy597.814435
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 3185 3041 1.92 86.40 0.11 0.20
2 A1 1517 1449 0.05 26.47 0.70 0.82
3 A1 474 453 0.34 13.74 0.19 0.32
4 A1 120 114 0.00 7.04 0.52 0.69
5 A2 1130 1079 0.00 19.33 0.75 0.86
6 B1 3265 3117 0.26 60.58 0.75 0.86
7 B1 755 721 12.40 5.16 0.75 0.86
8 B2 1225 1170 96.49 0.00 0.75 0.86
9 B2 605 578 33.95 15.34 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6138.4 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 5860.9 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
0.73306 0.01898 0.01856

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 1.068
I2 0.000 1.869 -0.092
I3 0.000 -1.869 -0.092
H4 -0.895 0.000 1.684
H5 0.895 0.000 1.684

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.20032.20031.08631.0863
I22.20033.73852.72962.7296
I32.20033.73852.72962.7296
H41.08632.72962.72961.7896
H51.08632.72962.72961.7896

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 116.325 I2 C1 H4 107.403
I2 C1 H5 107.403 I3 C1 H4 107.403
I3 C1 H5 107.403 H4 C1 H5 110.919
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability