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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: B1B95/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at B1B95/STO-3G
 hartrees
Energy at 0K-13746.291627
Energy at 298.15K 
HF Energy-13746.291627
Nuclear repulsion energy610.684701
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 B1B95/STO-3G
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 3393 2996 0.14 42.69 0.10 0.19
2 A1 1627 1437 0.02 19.54 0.69 0.82
3 A1 553 489 5.93 12.94 0.14 0.24
4 A1 136 120 0.39 5.14 0.51 0.68
5 A2 1235 1091 0.00 14.60 0.75 0.86
6 B1 3516 3105 0.09 33.25 0.75 0.86
7 B1 803 709 0.60 2.30 0.75 0.86
8 B2 1308 1155 83.71 1.27 0.75 0.86
9 B2 720 636 63.10 9.28 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 6645.9 cm-1
Scaled (by 0.883) Zero Point Vibrational Energy (zpe) 5868.3 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 B1B95/STO-3G
ABC
0.80442 0.01969 0.01929

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/STO-3G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.004
I2 0.000 1.835 -0.088
I3 0.000 -1.835 -0.088
H4 -0.887 0.000 1.650
H5 0.887 0.000 1.650

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.13522.13521.09741.0974
I22.13523.66952.67842.6784
I32.13523.66952.67842.6784
H41.09742.67842.67841.7745
H51.09742.67842.67841.7745

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 118.476 I2 C1 H4 107.517
I2 C1 H5 107.517 I3 C1 H4 107.517
I3 C1 H5 107.517 H4 C1 H5 107.901
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.314      
2 I 0.041      
3 I 0.041      
4 H 0.116      
5 H 0.116      


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 1.538 1.538
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -59.007 0.000 0.000
y 0.000 -62.415 0.000
z 0.000 0.000 -57.285
Traceless
 xyz
x 0.843 0.000 0.000
y 0.000 -4.269 0.000
z 0.000 0.000 3.426
Polar
3z2-r26.852
x2-y23.408
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.128 0.000 0.000
y 0.000 6.975 0.000
z 0.000 0.000 2.238


<r2> (average value of r2) Å2
<r2> 407.917
(<r2>)1/2 20.197