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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP2=FULL/6-311G*

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/6-311G*
 hartrees
Energy at 0K-263.703675
Energy at 298.15K-263.709527
HF Energy-262.729495
Nuclear repulsion energy208.118858
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/6-311G*
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 3226 3055 0.00      
2 Ag 1626 1540 0.00      
3 Ag 1265 1198 0.00      
4 Ag 1033 979 0.00      
5 Ag 602 570 0.00      
6 Au 954 904 0.00      
7 Au 340 322 0.00      
8 B1g 938 888 0.00      
9 B1u 3207 3037 3.97      
10 B1u 1515 1435 3.08      
11 B1u 1168 1106 5.24      
12 B1u 1040 985 37.63      
13 B2g 957 906 0.00      
14 B2g 760 720 0.00      
15 B2u 3221 3051 54.67      
16 B2u 1454 1377 35.47      
17 B2u 1351 1280 0.02      
18 B2u 1095 1037 9.09      
19 B3g 3206 3037 0.00      
20 B3g 1573 1489 0.00      
21 B3g 1378 1305 0.00      
22 B3g 715 677 0.00      
23 B3u 796 754 38.52      
24 B3u 420 398 22.79      

Unscaled Zero Point Vibrational Energy (zpe) 16920.3 cm-1
Scaled (by 0.9471) Zero Point Vibrational Energy (zpe) 16025.2 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/6-311G*
ABC
0.21411 0.19571 0.10225

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-311G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.419
N2 0.000 0.000 -1.419
C3 0.000 1.132 0.698
C4 0.000 -1.132 0.698
C5 0.000 -1.132 -0.698
C6 0.000 1.132 -0.698
H7 0.000 2.065 1.257
H8 0.000 -2.065 1.257
H9 0.000 -2.065 -1.257
H10 0.000 2.065 -1.257

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.83701.34191.34192.40072.40072.07142.07143.37983.3798
N22.83702.40072.40071.34191.34193.37983.37982.07142.0714
C31.34192.40072.26472.66081.39681.08733.24583.74802.1666
C41.34192.40072.26471.39682.66083.24581.08732.16663.7480
C52.40071.34192.66081.39682.26473.74802.16661.08733.2458
C62.40071.34191.39682.66082.26472.16663.74803.24581.0873
H72.07143.37981.08733.24583.74802.16664.13014.83522.5142
H82.07143.37983.24581.08732.16663.74804.13012.51424.8352
H93.37982.07143.74802.16661.08733.24584.83522.51424.1301
H103.37982.07142.16663.74803.24581.08732.51424.83524.1301

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.454 N1 C3 H7 116.627
N1 C4 C5 122.454 N1 C4 H8 116.627
N2 C5 C4 122.454 N2 C5 H9 116.627
N2 C6 C3 122.454 N2 C6 H10 116.627
C3 N1 C4 115.092 C3 C6 H10 120.919
C4 C5 H9 120.919 C5 N2 C6 115.092
C5 C4 H8 120.919 C6 C3 H7 120.919
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability