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 C2Cl2 (dichloroacetylene)

using model chemistry: CCD/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2H 1Σg
Energy calculated at CCD/6-31G*
 hartrees
Energy at 0K-995.127547
Energy at 298.15K-995.125773
HF Energy-994.594023
Nuclear repulsion energy152.820613
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 CCD/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σg 2386 2258 0.00      
2 Σg 482 456 0.00      
3 Σu 1011 957 41.95      
4 Πg 209 197 0.00      
4 Πg 209 197 0.00      
5 Πu 172 162 0.63      
5 Πu 172 162 0.63      

Unscaled Zero Point Vibrational Energy (zpe) 2318.8 cm-1
Scaled (by 0.9465) Zero Point Vibrational Energy (zpe) 2194.7 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 CCD/6-31G*
B
0.04627

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/6-31G*

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.603
C2 0.000 0.000 -0.603
Cl3 0.000 0.000 2.255
Cl4 0.000 0.000 -2.255

Atom - Atom Distances (Å)
  C1 C2 Cl3 Cl4
C11.20501.65252.8576
C21.20502.85761.6525
Cl31.65252.85764.5101
Cl42.85761.65254.5101

picture of dichloroacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 Cl4 180.000 C2 C1 Cl3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability