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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: B3LYP/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 B3LYP/3-21G
 hartrees
Energy at 0K-13820.216134
Energy at 298.15K 
HF Energy-13820.216134
Nuclear repulsion energy596.587110
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 B3LYP/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 3160 3049 1.30 97.60 0.09 0.16
2 A1 1475 1423 0.12 32.22 0.65 0.79
3 A1 468 452 0.79 19.12 0.16 0.28
4 A1 117 113 0.01 9.80 0.49 0.66
5 A2 1100 1062 0.00 16.85 0.75 0.86
6 B1 3248 3134 0.50 61.67 0.75 0.86
7 B1 740 714 13.73 5.27 0.75 0.86
8 B2 1190 1148 118.50 0.02 0.75 0.86
9 B2 567 547 80.25 13.97 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6032.2 cm-1
Scaled (by 0.9649) Zero Point Vibrational Energy (zpe) 5820.5 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 B3LYP/3-21G
ABC
0.73764 0.01887 0.01847

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/3-21G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.065
I2 0.000 1.874 -0.092
I3 0.000 -1.874 -0.092
H4 -0.898 0.000 1.675
H5 0.898 0.000 1.675

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.20282.20281.08541.0854
I22.20283.74862.72802.7280
I32.20283.74862.72802.7280
H41.08542.72802.72801.7956
H51.08542.72802.72801.7956

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 116.616 I2 C1 H4 107.171
I2 C1 H5 107.171 I3 C1 H4 107.171
I3 C1 H5 107.171 H4 C1 H5 111.618
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.922      
2 I 0.173      
3 I 0.173      
4 H 0.288      
5 H 0.288      


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 1.364 1.364
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -64.005 0.000 0.000
y 0.000 -63.758 0.000
z 0.000 0.000 -61.230
Traceless
 xyz
x -1.512 0.000 0.000
y 0.000 -1.140 0.000
z 0.000 0.000 2.652
Polar
3z2-r25.304
x2-y2-0.248
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.462 0.000 0.000
y 0.000 12.585 0.000
z 0.000 0.000 4.948


<r2> (average value of r2) Å2
<r2> 426.664
(<r2>)1/2 20.656