return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: QCISD(T)=FULL/cc-pVTZ-PP

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(T)=FULL/cc-pVTZ-PP
 hartrees
Energy at 0K-629.066741
Energy at 298.15K 
HF Energy-628.359714
Nuclear repulsion energy192.442861
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(T)=FULL/cc-pVTZ-PP
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 3159 3159        
2 A1 1432 1432        
3 A1 502 502        
4 A1 119 119        
5 A2 1066 1066        
6 B1 3217 3217        
7 B1 726 726        
8 B2 1145 1145        
9 B2 616 616        

Unscaled Zero Point Vibrational Energy (zpe) 5990.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 5990.6 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(T)=FULL/cc-pVTZ-PP
ABC
0.75485 0.02048 0.02001

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)=FULL/cc-pVTZ-PP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.052
I2 0.000 1.799 -0.091
I3 0.000 -1.799 -0.091
H4 -0.891 0.000 1.659
H5 0.891 0.000 1.659

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.13152.13151.07821.0782
I22.13153.59852.66332.6633
I32.13153.59852.66332.6633
H41.07822.66332.66331.7825
H51.07822.66332.66331.7825

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 115.159 I2 C1 H4 107.563
I2 C1 H5 107.563 I3 C1 H4 107.563
I3 C1 H5 107.563 H4 C1 H5 111.496
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability