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: HF/CEP-121G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at HF/CEP-121G
 hartrees
Energy at 0K-29.039335
Energy at 298.15K 
HF Energy-29.039335
Nuclear repulsion energy30.536089
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 HF/CEP-121G
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 3282 2994 10.18 117.83 0.09 0.16
2 A1 1543 1408 0.98 41.97 0.47 0.64
3 A1 503 459 0.64 55.95 0.16 0.27
4 A1 129 118 0.00 11.64 0.53 0.70
5 A2 1190 1086 0.00 29.09 0.75 0.86
6 B1 3391 3095 0.13 71.02 0.75 0.86
7 B1 810 739 20.06 8.48 0.75 0.86
8 B2 1294 1181 176.09 2.41 0.75 0.86
9 B2 619 565 70.59 40.58 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6380.3 cm-1
Scaled (by 0.9125) Zero Point Vibrational Energy (zpe) 5822.0 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 HF/CEP-121G
ABC
0.75510 0.01972 0.01928

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/CEP-121G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.052
I2 0.000 1.834 -0.091
I3 0.000 -1.834 -0.091
H4 -0.888 0.000 1.659
H5 0.888 0.000 1.659

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.16082.16081.07541.0754
I22.16083.66762.68562.6856
I32.16083.66762.68562.6856
H41.07542.68562.68561.7760
H51.07542.68562.68561.7760

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 116.132 I2 C1 H4 107.360
I2 C1 H5 107.360 I3 C1 H4 107.360
I3 C1 H5 107.360 H4 C1 H5 111.323
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-121G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.929      
2 I 0.211      
3 I 0.211      
4 H 0.254      
5 H 0.254      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 1.524 1.524
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -48.371 0.000 0.000
y 0.000 -48.663 0.000
z 0.000 0.000 -45.379
Traceless
 xyz
x -1.350 0.000 0.000
y 0.000 -1.788 0.000
z 0.000 0.000 3.138
Polar
3z2-r26.276
x2-y20.292
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.526 0.000 0.000
y 0.000 12.785 0.000
z 0.000 0.000 4.622


<r2> (average value of r2) Å2
<r2> 88.351
(<r2>)1/2 9.400