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All results from a given calculation for CH2I2 (Diiodomethane)

using model chemistry: CCSD/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 CCSD/Def2TZVPP
 hartrees
Energy at 0K-633.479299
Energy at 298.15K 
HF Energy-632.356427
Nuclear repulsion energy193.396852
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/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 3167 3167 0.28      
2 A1 1439 1439 0.21      
3 A1 512 512 0.11      
4 A1 121 121 0.01      
5 A2 1084 1084 0.00      
6 B1 3252 3252 3.12      
7 B1 738 738 6.85      
8 B2 1166 1166 94.25      
9 B2 631 631 26.76      

Unscaled Zero Point Vibrational Energy (zpe) 6054.8 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6054.8 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/Def2TZVPP
ABC
0.75951 0.02071 0.02023

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.047
I2 0.000 1.789 -0.091
I3 0.000 -1.789 -0.091
H4 -0.892 0.000 1.657
H5 0.892 0.000 1.657

Atom - Atom Distances (Å)
  C1 I2 I3 H4 H5
C12.12052.12051.08011.0801
I22.12053.57852.65512.6551
I32.12053.57852.65512.6551
H41.08012.65512.65511.7836
H51.08012.65512.65511.7836

picture of Diiodomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I2 C1 I3 115.086 I2 C1 H4 107.623
I2 C1 H5 107.623 I3 C1 H4 107.623
I3 C1 H5 107.623 H4 C1 H5 111.314
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability