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=FULL/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 MP2=FULL/6-31G**
 hartrees
Energy at 0K-995.135956
Energy at 298.15K-995.133998
HF Energy-994.592685
Nuclear repulsion energy153.185497
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=FULL/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 2293 2142 0.00      
2 Σg 485 453 0.00      
3 Σu 1024 957 52.25      
4 Πg 144 135 0.00      
4 Πg 144 135 0.00      
5 Πu 172 161 0.79      
5 Πu 172 161 0.79      

Unscaled Zero Point Vibrational Energy (zpe) 2216.6 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 2071.1 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=FULL/6-31G**
B
0.04646

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G**

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.608
C2 0.000 0.000 -0.608
Cl3 0.000 0.000 2.250
Cl4 0.000 0.000 -2.250

Atom - Atom Distances (Å)
  C1 C2 Cl3 Cl4
C11.21521.64212.8573
C21.21522.85731.6421
Cl31.64212.85734.4995
Cl42.85731.64214.4995

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=FULL/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.113      
2 C -0.113      
3 Cl 0.113      
4 Cl 0.113      


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 -36.068 0.000 0.000
y 0.000 -36.068 0.000
z 0.000 0.000 -31.501
Traceless
 xyz
x -2.284 0.000 0.000
y 0.000 -2.284 0.000
z 0.000 0.000 4.567
Polar
3z2-r29.134
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> 198.091
(<r2>)1/2 14.074