return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: CCD/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CCD/6-311G**
 hartrees
Energy at 0K-13873.235493
Energy at 298.15K 
HF Energy-13872.657341
Nuclear repulsion energy611.882922
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 CCD/6-311G**
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 3169 3027 1.00      
2 A1 1444 1379 0.24      
3 A1 496 474 0.17      
4 A1 122 117 0.02      
5 A2 1103 1053 0.00      
6 B1 3249 3103 1.51      
7 B1 741 708 8.58      
8 B2 1203 1149 106.60      
9 B2 609 582 24.14      

Unscaled Zero Point Vibrational Energy (zpe) 6068.3 cm-1
Scaled (by 0.9551) Zero Point Vibrational Energy (zpe) 5795.8 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 CCD/6-311G**
ABC
0.75567 0.01993 0.01949

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/6-311G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.049
I2 0.000 1.824 -0.091
I3 0.000 -1.824 -0.091
H4 -0.894 0.000 1.665
H5 0.894 0.000 1.665

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.15082.15081.08591.0859
I22.15083.64792.68512.6851
I32.15083.64792.68512.6851
H41.08592.68512.68511.7885
H51.08592.68512.68511.7885

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 115.999 I2 C1 H4 107.497
I2 C1 H5 107.497 I3 C1 H4 107.497
I3 C1 H5 107.497 H4 C1 H5 110.869
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability