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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: BLYP/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 BLYP/3-21G*
 hartrees
Energy at 0K-13820.324196
Energy at 298.15K 
HF Energy-13820.324196
Nuclear repulsion energy596.111323
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 BLYP/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 3068 3048 0.24 77.53 0.08 0.14
2 A1 1422 1413 0.12 28.33 0.62 0.76
3 A1 460 458 0.52 17.03 0.09 0.17
4 A1 108 108 0.00 8.01 0.38 0.55
5 A2 1045 1039 0.00 5.40 0.75 0.86
6 B1 3157 3136 1.89 50.20 0.75 0.86
7 B1 705 700 10.10 2.10 0.75 0.86
8 B2 1128 1120 99.53 0.04 0.75 0.86
9 B2 528 524 83.93 5.59 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5810.2 cm-1
Scaled (by 0.9935) Zero Point Vibrational Energy (zpe) 5772.4 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 BLYP/3-21G*
ABC
0.71708 0.01891 0.01849

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.083
I2 0.000 1.873 -0.093
I3 0.000 -1.873 -0.093
H4 -0.909 0.000 1.691
H5 0.909 0.000 1.691

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.21142.21141.09311.0931
I22.21143.74522.74122.7412
I32.21143.74522.74122.7412
H41.09312.74122.74121.8175
H51.09312.74122.74121.8175

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 115.733 I2 C1 H4 107.195
I2 C1 H5 107.195 I3 C1 H4 107.195
I3 C1 H5 107.195 H4 C1 H5 112.469
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.639      
2 I 0.062      
3 I 0.062      
4 H 0.257      
5 H 0.257      


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 1.159 1.159
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -63.886 0.000 0.000
y 0.000 -62.626 0.000
z 0.000 0.000 -60.674
Traceless
 xyz
x -2.236 0.000 0.000
y 0.000 -0.346 0.000
z 0.000 0.000 2.582
Polar
3z2-r25.164
x2-y2-1.260
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.763 0.000 0.000
y 0.000 14.991 0.000
z 0.000 0.000 7.622


<r2> (average value of r2) Å2
<r2> 426.008
(<r2>)1/2 20.640