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 CH3CHF2 (Ethane, 1,1-difluoro-)

using model chemistry: QCISD/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at QCISD/cc-pVTZ
 hartrees
Energy at 0K-277.924113
Energy at 298.15K 
HF Energy-277.055098
Nuclear repulsion energy132.766591
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 QCISD/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 A' 3168 3027 16.72      
2 A' 3114 2975 34.78      
3 A' 3078 2941 3.12      
4 A' 1505 1438 6.25      
5 A' 1468 1403 71.34      
6 A' 1411 1349 0.49      
7 A' 1191 1138 91.30      
8 A' 1173 1121 33.50      
9 A' 890 851 7.00      
10 A' 580 554 5.74      
11 A' 476 455 13.08      
12 A" 3165 3024 10.48      
13 A" 1507 1440 0.06      
14 A" 1421 1358 25.00      
15 A" 1193 1140 151.79      
16 A" 983 939 47.23      
17 A" 386 369 0.06      
18 A" 239 228 0.07      

Unscaled Zero Point Vibrational Energy (zpe) 13474.5 cm-1
Scaled (by 0.9555) Zero Point Vibrational Energy (zpe) 12874.8 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 QCISD/cc-pVTZ
ABC
0.31853 0.30108 0.17364

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.323 0.162 0.000
C2 -0.902 1.032 0.000
H3 1.260 0.719 0.000
F4 0.323 -0.645 1.093
F5 0.323 -0.645 -1.093
H6 -1.788 0.401 0.000
H7 -0.907 1.662 0.887
H8 -0.907 1.662 -0.887

Atom - Atom Distances (Å)
  C1 C2 H3 F4 F5 H6 H7 H8
C11.50221.08951.35921.35922.12482.13292.1329
C21.50222.18432.34702.34701.08841.08821.0882
H31.08952.18431.98301.98303.06472.52452.5245
F41.35922.34701.98302.18672.59742.62263.2801
F51.35922.34701.98302.18672.59743.28012.6226
H62.12481.08843.06472.59742.59741.77631.7763
H72.13291.08822.52452.62263.28011.77631.7748
H82.13291.08822.52453.28012.62261.77631.7748

picture of Ethane, 1,1-difluoro- state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H6 109.160 C1 C2 H7 109.819
C1 C2 H8 109.819 C2 C1 H3 113.927
C2 C1 F4 110.117 C2 C1 F5 110.117
H3 C1 F4 107.653 H3 C1 F5 107.653
F4 C1 F5 107.109 H6 C2 H7 109.383
H6 C2 H8 109.383 H7 C2 H8 109.263
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability