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 C2F2 (difluoroacetylene)

using model chemistry: B3PW91/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 1Σg
Energy calculated at B3PW91/6-31G
 hartrees
Energy at 0K-275.565774
Energy at 298.15K-275.564216
Nuclear repulsion energy93.006980
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 B3PW91/6-31G
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 2562 2454 0.00      
2 Σg 759 727 0.00      
3 Σu 1319 1263 189.36      
4 Πg 180 172 0.00      
4 Πg 180 172 0.00      
5 Πu 253 243 0.85      
5 Πu 253 243 0.85      

Unscaled Zero Point Vibrational Energy (zpe) 2753.2 cm-1
Scaled (by 0.9577) Zero Point Vibrational Energy (zpe) 2636.7 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 B3PW91/6-31G
B
0.11338

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.598
C2 0.000 0.000 -0.598
F3 0.000 0.000 1.920
F4 0.000 0.000 -1.920

Atom - Atom Distances (Å)
  C1 C2 F3 F4
C11.19521.32272.5179
C21.19522.51791.3227
F31.32272.51793.8405
F42.51791.32273.8405

picture of difluoroacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 F4 180.000 C2 C1 F3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.260      
2 C 0.260      
3 F -0.260      
4 F -0.260      


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 -19.833 0.000 0.000
y 0.000 -19.833 0.000
z 0.000 0.000 -22.633
Traceless
 xyz
x 1.400 0.000 0.000
y 0.000 1.400 0.000
z 0.000 0.000 -2.800
Polar
3z2-r2-5.600
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 1.111 0.000 0.000
y 0.000 1.111 0.000
z 0.000 0.000 4.664


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