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All results from a given calculation for C2F2 (difluoroacetylene)

using model chemistry: B3PW91/3-21G

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 B3PW91/3-21G
 hartrees
Energy at 0K-274.149666
Energy at 298.15K-274.148759
Nuclear repulsion energy93.738127
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 B3PW91/3-21G
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 2614 2513 0.00      
2 Σg 805 773 0.00      
3 Σu 1407 1353 186.53      
4 Πg 386 371 0.00      
4 Πg 386 371 0.00      
5 Πu 295 283 0.33      
5 Πu 295 283 0.33      

Unscaled Zero Point Vibrational Energy (zpe) 3094.1 cm-1
Scaled (by 0.9612) Zero Point Vibrational Energy (zpe) 2974.1 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 B3PW91/3-21G
B
0.11515

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.594
C2 0.000 0.000 -0.594
F3 0.000 0.000 1.905
F4 0.000 0.000 -1.905

Atom - Atom Distances (Å)
  C1 C2 F3 F4
C11.18901.31072.4997
C21.18902.49971.3107
F31.31072.49973.8104
F42.49971.31073.8104

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 B3PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.261      
2 C 0.261      
3 F -0.261      
4 F -0.261      


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 -19.855 0.000 0.000
y 0.000 -19.855 0.000
z 0.000 0.000 -21.475
Traceless
 xyz
x 0.810 0.000 0.000
y 0.000 0.810 0.000
z 0.000 0.000 -1.620
Polar
3z2-r2-3.240
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 0.911 0.000 0.000
y 0.000 0.911 0.000
z 0.000 0.000 4.409


<r2> (average value of r2) Å2
<r2> 82.315
(<r2>)1/2 9.073