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 C2H4F2 (1,2-difluoroethane)

using model chemistry: CCSD(T)/aug-cc-pVQZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2H anti 1Ag
Energy calculated at CCSD(T)/aug-cc-pVQZ
 hartrees
Energy at 0K-278.026493
Energy at 298.15K 
HF Energy-277.057631
Nuclear repulsion energy125.814638
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 CCSD(T)/aug-cc-pVQZ
Rotational Constants (cm-1) from geometry optimized at CCSD(T)/aug-cc-pVQZ
ABC
1.06748 0.12966 0.12093

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/aug-cc-pVQZ

Point Group is C2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.426 0.626 0.000
C2 -0.426 -0.626 0.000
F3 -0.426 1.721 0.000
F4 0.426 -1.721 0.000
H5 1.051 0.672 0.892
H6 1.051 0.672 -0.892
H7 -1.051 -0.672 0.892
H8 -1.051 -0.672 -0.892

Atom - Atom Distances (Å)
  C1 C2 F3 F4 H5 H6 H7 H8
C11.51401.38702.34641.09011.09012.15892.1589
C21.51402.34641.38702.15892.15891.09011.0901
F31.38702.34643.54492.01932.01932.62842.6284
F42.34641.38703.54492.62842.62842.01932.0193
H51.09012.15892.01932.62841.78312.49543.0670
H61.09012.15892.01932.62841.78313.06702.4954
H72.15891.09012.62842.01932.49543.06701.7831
H82.15891.09012.62842.01933.06702.49541.7831

picture of 1,2-difluoroethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 F4 107.882 C1 C2 H7 110.952
C1 C2 H8 110.952 C2 C1 F3 107.882
C2 C1 H5 110.952 C2 C1 H6 110.952
F3 C1 H5 108.619 F3 C1 H6 108.619
F4 C2 H7 108.619 F4 C2 H8 108.619
H5 C1 H6 109.737 H7 C2 H8 109.737
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability