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 CHF2CHF2 (1,1,2,2-tetrafluoroethane)

using model chemistry: PBEPBE/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2H 1AG
Energy calculated at PBEPBE/6-311G*
 hartrees
Energy at 0K-476.438656
Energy at 298.15K-476.442486
HF Energy-476.438656
Nuclear repulsion energy263.786733
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 PBEPBE/6-311G*
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 3015 2984 0.00      
2 Ag 1415 1400 0.00      
3 Ag 1111 1099 0.00      
4 Ag 1077 1066 0.00      
5 Ag 603 597 0.00      
6 Ag 348 344 0.00      
7 Au 1324 1310 35.08      
8 Au 1094 1083 400.93      
9 Au 196 194 2.25      
10 Au 76 75 1.87      
11 Bg 1349 1335 0.00      
12 Bg 1057 1046 0.00      
13 Bg 464 459 0.00      
14 Bu 3026 2995 65.95      
15 Bu 1278 1265 23.86      
16 Bu 1090 1079 221.00      
17 Bu 521 516 7.47      
18 Bu 397 392 43.79      

Unscaled Zero Point Vibrational Energy (zpe) 9719.9 cm-1
Scaled (by 0.9896) Zero Point Vibrational Energy (zpe) 9618.8 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 PBEPBE/6-311G*
ABC
0.16671 0.10343 0.06753

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/6-311G*

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.246 0.725 0.000
C2 0.246 -0.725 0.000
H3 -1.346 0.792 0.000
H4 1.346 -0.792 0.000
F5 0.246 1.355 1.111
F6 0.246 1.355 -1.111
F7 -0.246 -1.355 1.111
F8 -0.246 -1.355 -1.111

Atom - Atom Distances (Å)
  C1 C2 H3 H4 F5 F6 F7 F8
C11.53011.10262.19821.36871.36872.35762.3576
C21.53012.19821.10262.35762.35761.36871.3687
H31.10262.19823.12322.02132.02132.65572.6557
H42.19821.10263.12322.65572.65572.02132.0213
F51.36872.35762.02132.65572.22292.75333.5386
F61.36872.35762.02132.65572.22293.53862.7533
F72.35761.36872.65572.02132.75333.53862.2229
F82.35761.36872.65572.02133.53862.75332.2229

picture of 1,1,2,2-tetrafluoroethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H4 112.205 C1 C2 F7 108.711
C1 C2 F8 108.711 C2 C1 H3 112.205
C2 C1 F5 108.711 C2 C1 F6 108.711
H3 C1 F5 109.279 H3 C1 F6 109.279
H4 C2 F7 109.279 H4 C2 F8 109.279
F5 C1 F6 108.589 F7 C2 F8 108.589
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-311G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.183      
2 C 0.183      
3 H 0.202      
4 H 0.202      
5 F -0.193      
6 F -0.193      
7 F -0.193      
8 F -0.193      


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 -28.678 -2.499 0.000
y -2.499 -34.727 0.000
z 0.000 0.000 -35.002
Traceless
 xyz
x 6.187 -2.499 0.000
y -2.499 -2.887 0.000
z 0.000 0.000 -3.300
Polar
3z2-r2-6.600
x2-y26.049
xy-2.499
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.606 -0.036 0.000
y -0.036 3.670 0.000
z 0.000 0.000 3.827


<r2> (average value of r2) Å2
<r2> 145.087
(<r2>)1/2 12.045