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: MP2/CEP-121G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/CEP-121G
 hartrees
Energy at 0K-61.367678
Energy at 298.15K 
HF Energy-60.956951
Nuclear repulsion energy73.651498
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 MP2/CEP-121G
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' 3140 3064 40.21 22.86 0.03 0.06
2 A' 3120 3045 5.01 109.99 0.47 0.64
3 A' 3006 2934 4.78 126.97 0.01 0.03
4 A' 1516 1480 6.29 10.93 0.75 0.86
5 A' 1469 1434 35.81 2.17 0.60 0.75
6 A' 1393 1360 28.97 3.11 0.73 0.84
7 A' 1178 1149 28.97 3.27 0.29 0.45
8 A' 1089 1063 76.21 5.09 0.66 0.80
9 A' 836 816 23.13 10.46 0.13 0.23
10 A' 514 502 13.98 1.67 0.37 0.54
11 A' 416 406 16.20 2.00 0.74 0.85
12 A" 3122 3047 14.17 51.24 0.75 0.86
13 A" 1509 1473 5.70 10.66 0.75 0.86
14 A" 1362 1329 28.54 7.33 0.75 0.86
15 A" 1124 1097 67.98 5.70 0.75 0.86
16 A" 887 866 115.93 8.58 0.75 0.86
17 A" 362 353 0.05 0.61 0.75 0.86
18 A" 230 225 0.11 0.00 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 13135.7 cm-1
Scaled (by 0.976) Zero Point Vibrational Energy (zpe) 12820.5 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 MP2/CEP-121G
ABC
0.28494 0.28249 0.15906

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.333 0.203 0.000
C2 -0.932 1.059 0.000
H3 1.298 0.723 0.000
F4 0.333 -0.671 1.160
F5 0.333 -0.671 -1.160
H6 -1.811 0.400 0.000
H7 -0.947 1.693 0.899
H8 -0.947 1.693 -0.899

Atom - Atom Distances (Å)
  C1 C2 H3 F4 F5 H6 H7 H8
C11.52741.09581.45261.45262.15292.15982.1598
C21.52742.25512.43732.43731.09861.09961.0996
H31.09582.25512.05412.05413.12542.60542.6054
F41.45262.43732.05412.31952.66252.70113.3859
F51.45262.43732.05412.31952.66253.38592.7011
H62.15291.09863.12542.66252.66251.79581.7958
H72.15981.09962.60542.70113.38591.79581.7971
H82.15981.09962.60543.38592.70111.79581.7971

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 109.040 C1 C2 H7 109.524
C1 C2 H8 109.524 C2 C1 H3 117.616
C2 C1 F4 109.719 C2 C1 F5 109.719
H3 C1 F4 106.586 H3 C1 F5 106.586
F4 C1 F5 105.962 H6 C2 H7 109.566
H6 C2 H8 109.566 H7 C2 H8 109.607
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability