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: B3LYP/CEP-121G

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 B3LYP/CEP-121G
 hartrees
Energy at 0K-59.460862
Energy at 298.15K-59.459548
Nuclear repulsion energy47.625768
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 B3LYP/CEP-121G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Σg 2492 2428 0.00      
2 Σg 728 710 0.00      
3 Σu 1268 1235 203.29      
4 Πg 266 259 0.00      
4 Πg 266 259 0.00      
5 Πu 253 246 0.41      
5 Πu 253 246 0.41      

Unscaled Zero Point Vibrational Energy (zpe) 2762.2 cm-1
Scaled (by 0.9745) Zero Point Vibrational Energy (zpe) 2691.8 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 B3LYP/CEP-121G
B
0.11160

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/CEP-121G

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.601
C2 0.000 0.000 -0.601
F3 0.000 0.000 1.936
F4 0.000 0.000 -1.936

Atom - Atom Distances (Å)
  C1 C2 F3 F4
C11.20281.33432.5371
C21.20282.53711.3343
F31.33432.53713.8715
F42.53711.33433.8715

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 B3LYP/CEP-121G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.089      
2 C 0.089      
3 F -0.089      
4 F -0.089      


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 -20.279 0.000 0.000
y 0.000 -20.279 0.000
z 0.000 0.000 -23.451
Traceless
 xyz
x 1.586 0.000 0.000
y 0.000 1.586 0.000
z 0.000 0.000 -3.172
Polar
3z2-r2-6.344
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 1.430 0.000 0.000
y 0.000 1.430 0.000
z 0.000 0.000 4.981


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