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 C2H6 (Ethane)

using model chemistry: CISD/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D3D 1A1g
Energy calculated at CISD/STO-3G
 hartrees
Energy at 0K-78.444329
Energy at 298.15K-78.450188
HF Energy-78.303669
Nuclear repulsion energy41.573521
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 CISD/STO-3G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1g 3342 3342 0.00      
2 A1g 1630 1630 0.00      
3 A1g 1115 1115 0.00      
4 A1u 297 297 0.00      
5 A2u 3331 3331 6.81      
6 A2u 1595 1595 1.06      
7 Eg 3488 3488 0.00      
7 Eg 3488 3488 0.00      
8 Eg 1708 1708 0.00      
8 Eg 1708 1708 0.00      
9 Eg 1358 1358 0.00      
9 Eg 1358 1358 0.00      
10 Eu 3500 3500 7.67      
10 Eu 3500 3500 7.67      
11 Eu 1724 1724 1.86      
11 Eu 1724 1724 1.86      
12 Eu 912 912 2.92      
12 Eu 912 912 2.92      

Unscaled Zero Point Vibrational Energy (zpe) 18346.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 18346.4 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 CISD/STO-3G
ABC
2.59898 0.64574 0.64574

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/STO-3G

Point Group is D3d

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.779
C2 0.000 0.000 -0.779
H3 0.000 1.036 1.171
H4 -0.897 -0.518 1.171
H5 0.897 -0.518 1.171
H6 0.000 -1.036 -1.171
H7 -0.897 0.518 -1.171
H8 0.897 0.518 -1.171

Atom - Atom Distances (Å)
  C1 C2 H3 H4 H5 H6 H7 H8
C11.55841.10731.10731.10732.20812.20812.2081
C21.55842.20812.20812.20811.10731.10731.1073
H31.10732.20811.79391.79393.12662.56082.5608
H41.10732.20811.79391.79392.56082.56083.1266
H51.10732.20811.79391.79392.56083.12662.5608
H62.20811.10733.12662.56082.56081.79391.7939
H72.20811.10732.56082.56083.12661.79391.7939
H82.20811.10732.56083.12662.56081.79391.7939

picture of Ethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H6 110.722 C1 C2 H7 110.722
C1 C2 H8 110.722 C2 C1 H3 110.722
C2 C1 H4 110.722 C2 C1 H5 110.722
H3 C1 H4 108.192 H3 C1 H5 108.192
H4 C1 H5 108.192 H6 C2 H7 108.192
H6 C2 H8 108.192 H7 C2 H8 108.192
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability