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: BLYP/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 BLYP/6-31G
 hartrees
Energy at 0K-275.646793
Energy at 298.15K-275.645396
Nuclear repulsion energy91.918891
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 BLYP/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 Ag 2400 2381 0.00      
2 Ag 733 727 0.00      
3 Ag 218 217 0.00      
4 Au 237 236 0.11      
5 Bu 1252 1243 174.80      
6 Bu 246 245 2.08      

Unscaled Zero Point Vibrational Energy (zpe) 2543.2 cm-1
Scaled (by 0.9924) Zero Point Vibrational Energy (zpe) 2523.9 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 BLYP/6-31G
ABC
86.33998 0.11151 0.11136

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

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.071 0.603 0.000
C2 0.071 -0.603 0.000
F3 0.071 1.935 0.000
F4 -0.071 -1.935 0.000

Atom - Atom Distances (Å)
  C1 C2 F3 F4
C11.21431.34002.5384
C21.21432.53841.3400
F31.34002.53843.8735
F42.53841.34003.8735

picture of difluoroacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 F4 167.224 C2 C1 F3 167.224
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.214      
2 C 0.214      
3 F -0.214      
4 F -0.214      


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 -19.933 -0.031 0.000
y -0.031 -21.936 0.000
z 0.000 0.000 -19.907
Traceless
 xyz
x 0.988 -0.031 0.000
y -0.031 -2.015 0.000
z 0.000 0.000 1.027
Polar
3z2-r22.054
x2-y22.002
xy-0.031
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.238 -0.291 0.000
y -0.291 4.923 0.000
z 0.000 0.000 1.177


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