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: PBE1PBE/cc-pVTZ-PP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBE1PBE/cc-pVTZ-PP
 hartrees
Energy at 0K-630.715431
Energy at 298.15K 
HF Energy-630.715431
Nuclear repulsion energy192.465616
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 PBE1PBE/cc-pVTZ-PP
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 3147 3147 0.00 83.96 0.05 0.10
2 A1 1408 1408 0.01 17.19 0.49 0.65
3 A1 506 506 0.16 19.40 0.08 0.14
4 A1 118 118 0.02 5.01 0.34 0.51
5 A2 1060 1060 0.00 1.08 0.75 0.86
6 B1 3236 3236 5.42 41.27 0.75 0.86
7 B1 727 727 7.30 0.75 0.75 0.86
8 B2 1139 1139 92.65 0.94 0.75 0.86
9 B2 608 608 46.89 6.44 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5974.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 5974.4 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 PBE1PBE/cc-pVTZ-PP
ABC
0.75912 0.02047 0.02000

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/cc-pVTZ-PP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.048
I2 0.000 1.800 -0.091
I3 0.000 -1.800 -0.091
H4 -0.897 0.000 1.655
H5 0.897 0.000 1.655

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.12952.12951.08301.0830
I22.12953.59952.66282.6628
I32.12953.59952.66282.6628
H41.08302.66282.66281.7931
H51.08302.66282.66281.7931

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 115.381 I2 C1 H4 107.449
I2 C1 H5 107.449 I3 C1 H4 107.449
I3 C1 H5 107.449 H4 C1 H5 111.749
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/cc-pVTZ-PP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.323      
2 I 0.009      
3 I 0.009      
4 H 0.152      
5 H 0.152      


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 1.186 1.186
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -61.046 0.000 0.000
y 0.000 -60.497 0.000
z 0.000 0.000 -58.072
Traceless
 xyz
x -1.762 0.000 0.000
y 0.000 -0.938 0.000
z 0.000 0.000 2.699
Polar
3z2-r25.399
x2-y2-0.549
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 8.044 0.000 0.000
y 0.000 15.301 0.000
z 0.000 0.000 8.900


<r2> (average value of r2) Å2
<r2> 213.434
(<r2>)1/2 14.609