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: MP2/SDD

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2H 1Σg
Energy calculated at MP2/SDD
 hartrees
Energy at 0K-994.775536
Energy at 298.15K-994.773818
HF Energy-994.486663
Nuclear repulsion energy146.477078
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 MP2/SDD
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 2198 2122 0.00      
2 Σg 409 395 0.00      
3 Σu 868 838 17.80      
4 Πg 294 284 0.00      
4 Πg 294 284 0.00      
5 Πu 146 141 1.34      
5 Πu 146 141 1.34      

Unscaled Zero Point Vibrational Energy (zpe) 2177.9 cm-1
Scaled (by 0.9653) Zero Point Vibrational Energy (zpe) 2102.3 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 MP2/SDD
B
0.04253

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/SDD

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.618
C2 0.000 0.000 -0.618
Cl3 0.000 0.000 2.353
Cl4 0.000 0.000 -2.353

Atom - Atom Distances (Å)
  C1 C2 Cl3 Cl4
C11.23631.73472.9710
C21.23632.97101.7347
Cl31.73472.97104.7056
Cl42.97101.73474.7056

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
Charges from optimized geometry at MP2/SDD Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.054      
2 C -0.054      
3 Cl 0.054      
4 Cl 0.054      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.000 0.000
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -36.943 0.000 0.000
y 0.000 -36.943 0.000
z 0.000 0.000 -33.465
Traceless
 xyz
x -1.739 0.000 0.000
y 0.000 -1.739 0.000
z 0.000 0.000 3.479
Polar
3z2-r26.957
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 0.000
(<r2>)1/2 0.000