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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-263.530423
Energy at 298.15K-263.536283
HF Energy-262.679599
Nuclear repulsion energy208.098874
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 3245 3058 0.00      
2 Ag 1643 1548 0.00      
3 Ag 1282 1208 0.00      
4 Ag 1044 983 0.00      
5 Ag 606 571 0.00      
6 Au 968 912 0.00      
7 Au 345 325 0.00      
8 B1g 948 894 0.00      
9 B1u 3227 3040 5.59      
10 B1u 1534 1445 4.03      
11 B1u 1178 1110 3.15      
12 B1u 1042 982 38.10      
13 B2g 956 901 0.00      
14 B2g 754 711 0.00      
15 B2u 3241 3053 48.93      
16 B2u 1473 1388 33.82      
17 B2u 1368 1289 0.10      
18 B2u 1114 1050 12.01      
19 B3g 3226 3040 0.00      
20 B3g 1592 1500 0.00      
21 B3g 1398 1317 0.00      
22 B3g 719 678 0.00      
23 B3u 805 759 26.80      
24 B3u 427 402 24.46      

Unscaled Zero Point Vibrational Energy (zpe) 17067.4 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 16080.9 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
0.21323 0.19647 0.10225

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 1.415
N2 0.000 0.000 -1.415
C3 0.000 1.135 0.697
C4 0.000 -1.135 0.697
C5 0.000 -1.135 -0.697
C6 0.000 1.135 -0.697
H7 0.000 2.067 1.257
H8 0.000 -2.067 1.257
H9 0.000 -2.067 -1.257
H10 0.000 2.067 -1.257

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.83091.34321.34322.39812.39812.07352.07353.37873.3787
N22.83092.39812.39811.34321.34323.37873.37872.07352.0735
C31.34322.39812.26982.66381.39411.08773.25093.75142.1651
C41.34322.39812.26981.39412.66383.25091.08772.16513.7514
C52.39811.34322.66381.39412.26983.75142.16511.08773.2509
C62.39811.34321.39412.66382.26982.16513.75143.25091.0877
H72.07353.37871.08773.25093.75142.16514.13494.83912.5139
H82.07353.37873.25091.08772.16513.75144.13492.51394.8391
H93.37872.07353.75142.16511.08773.25094.83912.51394.1349
H103.37872.07352.16513.75143.25091.08772.51394.83914.1349

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.333 N1 C3 H7 116.688
N1 C4 C5 122.333 N1 C4 H8 116.688
N2 C5 C4 122.333 N2 C5 H9 116.688
N2 C6 C3 122.333 N2 C6 H10 116.688
C3 N1 C4 115.335 C3 C6 H10 120.980
C4 C5 H9 120.980 C5 N2 C6 115.335
C5 C4 H8 120.980 C6 C3 H7 120.980
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability