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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-13820.180000
Energy at 298.15K 
HF Energy-13820.180000
Nuclear repulsion energy588.551372
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 3082 3065 1.80 98.82 0.08 0.15
2 A1 1430 1422 0.02 32.31 0.65 0.79
3 A1 444 442 0.85 16.96 0.17 0.29
4 A1 111 110 0.00 11.71 0.47 0.64
5 A2 1056 1050 0.00 15.08 0.75 0.86
6 B1 3173 3155 0.03 60.44 0.75 0.86
7 B1 712 708 13.28 5.52 0.75 0.86
8 B2 1143 1137 119.08 0.17 0.75 0.86
9 B2 520 517 109.49 8.94 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5835.3 cm-1
Scaled (by 0.9945) Zero Point Vibrational Energy (zpe) 5803.2 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
0.72784 0.01833 0.01795

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 1.073
I2 0.000 1.902 -0.092
I3 0.000 -1.902 -0.092
H4 -0.907 0.000 1.682
H5 0.907 0.000 1.682

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.23062.23061.09211.0921
I22.23063.80332.75442.7544
I32.23063.80332.75442.7544
H41.09212.75442.75441.8140
H51.09212.75442.75441.8140

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 116.977 I2 C1 H4 106.925
I2 C1 H5 106.925 I3 C1 H4 106.925
I3 C1 H5 106.925 H4 C1 H5 112.305
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 -0.851      
2 I 0.152      
3 I 0.152      
4 H 0.273      
5 H 0.273      


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 1.342 1.342
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -64.027 0.000 0.000
y 0.000 -63.551 0.000
z 0.000 0.000 -61.236
Traceless
 xyz
x -1.634 0.000 0.000
y 0.000 -0.920 0.000
z 0.000 0.000 2.554
Polar
3z2-r25.107
x2-y2-0.476
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.522 0.000 0.000
y 0.000 13.430 0.000
z 0.000 0.000 5.014


<r2> (average value of r2) Å2
<r2> 437.759
(<r2>)1/2 20.923