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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: QCISD/Def2TZVPP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at QCISD/Def2TZVPP
 hartrees
Energy at 0K-633.480365
Energy at 298.15K 
HF Energy-632.356427
Nuclear repulsion energy193.345564
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 QCISD/Def2TZVPP
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 3164 3164 0.32      
2 A1 1438 1438 0.25      
3 A1 510 510 0.13      
4 A1 121 121 0.01      
5 A2 1082 1082 0.00      
6 B1 3249 3249 2.98      
7 B1 738 738 6.81      
8 B2 1164 1164 95.41      
9 B2 629 629 28.03      

Unscaled Zero Point Vibrational Energy (zpe) 6046.9 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6046.9 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 QCISD/Def2TZVPP
ABC
0.75820 0.02070 0.02023

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/Def2TZVPP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.049
I2 0.000 1.789 -0.091
I3 0.000 -1.789 -0.091
H4 -0.892 0.000 1.658
H5 0.892 0.000 1.658

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.12132.12131.08031.0803
I22.12133.57902.65612.6561
I32.12133.57902.65612.6561
H41.08032.65612.65611.7844
H51.08032.65612.65611.7844

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 115.039 I2 C1 H4 107.625
I2 C1 H5 107.625 I3 C1 H4 107.625
I3 C1 H5 107.625 H4 C1 H5 111.358
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability