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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: CISD/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at CISD/6-31G**
 hartrees
Energy at 0K-263.402371
Energy at 298.15K-263.397166
Nuclear repulsion energy210.109082
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/6-31G**
Rotational Constants (cm-1) from geometry optimized at CISD/6-31G**
ABC
0.21697 0.20052 0.10421

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/6-31G**

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.398
N2 0.000 0.000 -1.398
C3 0.000 1.125 0.694
C4 0.000 -1.125 0.694
C5 0.000 -1.125 -0.694
C6 0.000 1.125 -0.694
H7 0.000 2.050 1.245
H8 0.000 -2.050 1.245
H9 0.000 -2.050 -1.245
H10 0.000 2.050 -1.245

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.79551.32721.32722.37492.37492.05522.05523.34433.3443
N22.79552.37492.37491.32721.32723.34433.34432.05522.0552
C31.32722.37492.25022.64371.38761.07633.22213.71992.1479
C41.32722.37492.25021.38762.64373.22211.07632.14793.7199
C52.37491.32722.64371.38762.25023.71992.14791.07633.2221
C62.37491.32721.38762.64372.25022.14793.71993.22211.0763
H72.05523.34431.07633.22213.71992.14794.09914.79612.4900
H82.05523.34433.22211.07632.14793.71994.09912.49004.7961
H93.34432.05523.71992.14791.07633.22214.79612.49004.0991
H103.34432.05522.14793.71993.22211.07632.49004.79614.0991

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.033 N1 C3 H7 117.161
N1 C4 C5 122.033 N1 C4 H8 117.161
N2 C5 C4 122.033 N2 C5 H9 117.161
N2 C6 C3 122.033 N2 C6 H10 117.161
C3 N1 C4 115.934 C3 C6 H10 120.806
C4 C5 H9 120.806 C5 N2 C6 115.934
C5 C4 H8 120.806 C6 C3 H7 120.806
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability