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: B3PW91/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2H 1AG
Energy calculated at B3PW91/3-21G*
 hartrees
Energy at 0K-474.003014
Energy at 298.15K-474.006870
HF Energy-474.003014
Nuclear repulsion energy262.843256
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 Ag 3131 3003 0.00      
2 Ag 1485 1425 0.00      
3 Ag 1151 1105 0.00      
4 Ag 1098 1053 0.00      
5 Ag 597 572 0.00      
6 Ag 346 332 0.00      
7 Au 1403 1346 48.59      
8 Au 1195 1146 225.22      
9 Au 187 180 3.53      
10 Au 86 82 2.04      
11 Bg 1420 1363 0.00      
12 Bg 1141 1095 0.00      
13 Bg 467 448 0.00      
14 Bu 3148 3020 58.61      
15 Bu 1353 1298 19.50      
16 Bu 1133 1087 151.76      
17 Bu 510 489 11.97      
18 Bu 384 368 56.55      

Unscaled Zero Point Vibrational Energy (zpe) 10116.7 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 9706.0 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*
ABC
0.16183 0.10510 0.06743

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

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.250 0.714 0.000
C2 0.250 -0.714 0.000
H3 -1.340 0.743 0.000
H4 1.340 -0.743 0.000
F5 0.250 1.344 1.129
F6 0.250 1.344 -1.129
F7 -0.250 -1.344 1.129
F8 -0.250 -1.344 -1.129

Atom - Atom Distances (Å)
  C1 C2 H3 H4 F5 F6 F7 F8
C11.51331.09062.15651.38581.38582.34722.3472
C21.51332.15651.09062.34722.34721.38581.3858
H31.09062.15653.06422.04042.04042.61082.6108
H42.15651.09063.06422.61082.61082.04042.0404
F51.38582.34722.04042.61082.25822.73323.5454
F61.38582.34722.04042.61082.25823.54542.7332
F72.34721.38582.61082.04042.73323.54542.2582
F82.34721.38582.61082.04043.54542.73322.2582

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 110.778 C1 C2 F7 108.037
C1 C2 F8 108.037 C2 C1 H3 110.778
C2 C1 F5 108.037 C2 C1 F6 108.037
H3 C1 F5 110.395 H3 C1 F6 110.395
H4 C2 F7 110.395 H4 C2 F8 110.395
F5 C1 F6 109.125 F7 C2 F8 109.125
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 0.315      
2 C 0.315      
3 H 0.246      
4 H 0.246      
5 F -0.280      
6 F -0.280      
7 F -0.280      
8 F -0.280      


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 -27.896 -2.654 0.000
y -2.654 -34.649 0.000
z 0.000 0.000 -35.045
Traceless
 xyz
x 6.951 -2.654 0.000
y -2.654 -3.178 0.000
z 0.000 0.000 -3.772
Polar
3z2-r2-7.544
x2-y26.753
xy-2.654
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.879 0.033 0.000
y 0.033 2.805 0.000
z 0.000 0.000 3.168


<r2> (average value of r2) Å2
<r2> 145.012
(<r2>)1/2 12.042