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/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-476.492491
Energy at 298.15K-476.496327
HF Energy-476.492491
Nuclear repulsion energy264.008093
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/cc-pVTZ
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 2988 2968 0.00      
2 Ag 1394 1385 0.00      
3 Ag 1105 1098 0.00      
4 Ag 1072 1064 0.00      
5 Ag 603 599 0.00      
6 Ag 347 345 0.00      
7 Au 1291 1283 21.66      
8 Au 1093 1086 390.67      
9 Au 196 195 1.87      
10 Au 74 74 1.71      
11 Bg 1322 1313 0.00      
12 Bg 1054 1047 0.00      
13 Bg 462 459 0.00      
14 Bu 3001 2980 50.26      
15 Bu 1270 1261 18.66      
16 Bu 1092 1085 203.48      
17 Bu 521 518 7.17      
18 Bu 392 389 40.09      

Unscaled Zero Point Vibrational Energy (zpe) 9639.1 cm-1
Scaled (by 0.9931) Zero Point Vibrational Energy (zpe) 9572.6 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/cc-pVTZ
ABC
0.16749 0.10330 0.06761

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/cc-pVTZ

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 0.789 0.000
H4 1.346 -0.789 0.000
F5 0.246 1.355 1.109
F6 0.246 1.355 -1.109
F7 -0.246 -1.355 1.109
F8 -0.246 -1.355 -1.109

Atom - Atom Distances (Å)
  C1 C2 H3 H4 F5 F6 F7 F8
C11.53191.10202.19761.36661.36662.35772.3577
C21.53192.19761.10202.35772.35771.36661.3666
H31.10202.19763.12102.02082.02082.65322.6532
H42.19761.10203.12102.65322.65322.02082.0208
F51.36662.35772.02082.65322.21722.75503.5363
F61.36662.35772.02082.65322.21723.53632.7550
F72.35771.36662.65322.02082.75503.53632.2172
F82.35771.36662.65322.02083.53632.75502.2172

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 112.059 C1 C2 F7 108.725
C1 C2 F8 108.725 C2 C1 H3 112.059
C2 C1 F5 108.725 C2 C1 F6 108.725
H3 C1 F5 109.418 H3 C1 F6 109.418
H4 C2 F7 109.418 H4 C2 F8 109.418
F5 C1 F6 108.423 F7 C2 F8 108.423
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.285      
2 C 0.285      
3 H 0.037      
4 H 0.037      
5 F -0.161      
6 F -0.161      
7 F -0.161      
8 F -0.161      


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 -28.887 -2.527 0.000
y -2.527 -34.704 0.000
z 0.000 0.000 -34.963
Traceless
 xyz
x 5.947 -2.527 0.000
y -2.527 -2.779 0.000
z 0.000 0.000 -3.168
Polar
3z2-r2-6.336
x2-y25.817
xy-2.527
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.028 0.005 0.000
y 0.005 4.260 0.000
z 0.000 0.000 4.342


<r2> (average value of r2) Å2
<r2> 144.980
(<r2>)1/2 12.041