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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP2=FULL/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 MP2=FULL/6-31G
 hartrees
Energy at 0K-263.129621
Energy at 298.15K-263.135420
HF Energy-262.547805
Nuclear repulsion energy204.758385
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=FULL/6-31G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Ag 3240 3079 0.00      
2 Ag 1568 1489 0.00      
3 Ag 1268 1205 0.00      
4 Ag 991 941 0.00      
5 Ag 616 585 0.00      
6 Au 942 895 0.00      
7 Au 337 321 0.00      
8 B1g 929 882 0.00      
9 B1u 3218 3057 9.03      
10 B1u 1495 1420 13.28      
11 B1u 1147 1090 0.00      
12 B1u 1003 953 26.25      
13 B2g 932 886 0.00      
14 B2g 735 699 0.00      
15 B2u 3232 3071 47.63      
16 B2u 1438 1366 29.60      
17 B2u 1217 1156 7.26      
18 B2u 1082 1028 9.72      
19 B3g 3214 3053 0.00      
20 B3g 1497 1422 0.00      
21 B3g 1383 1314 0.00      
22 B3g 712 677 0.00      
23 B3u 788 748 33.60      
24 B3u 425 404 29.40      

Unscaled Zero Point Vibrational Energy (zpe) 16703.4 cm-1
Scaled (by 0.9501) Zero Point Vibrational Energy (zpe) 15869.9 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=FULL/6-31G
ABC
0.20385 0.19226 0.09894

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.431
N2 0.000 0.000 -1.431
C3 0.000 1.164 0.704
C4 0.000 -1.164 0.704
C5 0.000 -1.164 -0.704
C6 0.000 1.164 -0.704
H7 0.000 2.090 1.275
H8 0.000 -2.090 1.275
H9 0.000 -2.090 -1.275
H10 0.000 2.090 -1.275

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.86181.37281.37282.43172.43172.09612.09613.41923.4192
N22.86182.43172.43171.37281.37283.41923.41922.09612.0961
C31.37282.43172.32892.72131.40781.08783.30443.80912.1848
C41.37282.43172.32891.40782.72133.30441.08782.18483.8091
C52.43171.37282.72131.40782.32893.80912.18481.08783.3044
C62.43171.37281.40782.72132.32892.18483.80913.30441.0878
H72.09613.41921.08783.30443.80912.18484.18054.89692.5501
H82.09613.41923.30441.08782.18483.80914.18052.55014.8969
H93.41922.09613.80912.18481.08783.30444.89692.55014.1805
H103.41922.09612.18483.80913.30441.08782.55014.89694.1805

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.978 N1 C3 H7 116.352
N1 C4 C5 121.978 N1 C4 H8 116.352
N2 C5 C4 121.978 N2 C5 H9 116.352
N2 C6 C3 121.978 N2 C6 H10 116.352
C3 N1 C4 116.044 C3 C6 H10 121.670
C4 C5 H9 121.670 C5 N2 C6 116.044
C5 C4 H8 121.670 C6 C3 H7 121.670
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability