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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-263.048384
Energy at 298.15K-263.043124
Nuclear repulsion energy207.306943
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
0.20801 0.19808 0.10146

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 1.404
N2 0.000 0.000 -1.404
C3 0.000 1.152 0.699
C4 0.000 -1.152 0.699
C5 0.000 -1.152 -0.699
C6 0.000 1.152 -0.699
H7 0.000 2.073 1.265
H8 0.000 -2.073 1.265
H9 0.000 -2.073 -1.265
H10 0.000 2.073 -1.265

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.80761.35061.35062.39792.39792.07762.07763.37963.3796
N22.80762.39792.39791.35061.35063.37963.37962.07762.0776
C31.35062.39792.30432.69531.39821.08103.27453.77632.1696
C41.35062.39792.30431.39822.69533.27451.08102.16963.7763
C52.39791.35062.69531.39822.30433.77632.16961.08103.2745
C62.39791.35061.39822.69532.30432.16963.77633.27451.0810
H72.07763.37961.08103.27453.77632.16964.14604.85732.5307
H82.07763.37963.27451.08102.16963.77634.14602.53074.8573
H93.37962.07763.77632.16961.08103.27454.85732.53074.1460
H103.37962.07762.16963.77633.27451.08102.53074.85734.1460

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.452 N1 C3 H7 116.958
N1 C4 C5 121.452 N1 C4 H8 116.958
N2 C5 C4 121.452 N2 C5 H9 116.958
N2 C6 C3 121.452 N2 C6 H10 116.958
C3 N1 C4 117.096 C3 C6 H10 121.590
C4 C5 H9 121.590 C5 N2 C6 117.096
C5 C4 H8 121.590 C6 C3 H7 121.590
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability