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: CCSD/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 CCSD/cc-pVTZ-PP
 hartrees
Energy at 0K-628.971509
Energy at 298.15K 
HF Energy-628.359649
Nuclear repulsion energy192.619137
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 CCSD/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 3161 3015 0.31      
2 A1 1439 1373 0.21      
3 A1 511 488 0.12      
4 A1 122 116 0.02      
5 A2 1082 1032 0.00      
6 B1 3242 3093 3.06      
7 B1 738 704 6.49      
8 B2 1166 1112 94.71      
9 B2 633 604 26.27      

Unscaled Zero Point Vibrational Energy (zpe) 6046.4 cm-1
Scaled (by 0.954) Zero Point Vibrational Energy (zpe) 5768.3 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 CCSD/cc-pVTZ-PP
ABC
0.75613 0.02052 0.02005

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD/cc-pVTZ-PP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.050
I2 0.000 1.797 -0.091
I3 0.000 -1.797 -0.091
H4 -0.892 0.000 1.661
H5 0.892 0.000 1.661

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.12882.12881.08091.0809
I22.12883.59472.66342.6634
I32.12883.59472.66342.6634
H41.08092.66342.66341.7837
H51.08092.66342.66341.7837

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 115.196 I2 C1 H4 107.623
I2 C1 H5 107.623 I3 C1 H4 107.623
I3 C1 H5 107.623 H4 C1 H5 111.196
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability