return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP2=FULL/6-31+G**

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/6-31+G**
 hartrees
Energy at 0K-263.579600
Energy at 298.15K-263.585404
HF Energy-262.694261
Nuclear repulsion energy208.017792
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/6-31+G**
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 3274 3075 0.00      
2 Ag 1634 1535 0.00      
3 Ag 1273 1196 0.00      
4 Ag 1036 973 0.00      
5 Ag 605 568 0.00      
6 Au 946 889 0.00      
7 Au 330 310 0.00      
8 B1g 939 882 0.00      
9 B1u 3256 3058 1.61      
10 B1u 1525 1433 0.66      
11 B1u 1171 1100 6.52      
12 B1u 1037 974 28.19      
13 B2g 926 870 0.00      
14 B2g 691 649 0.00      
15 B2u 3270 3071 46.62      
16 B2u 1465 1376 33.69      
17 B2u 1369 1286 0.26      
18 B2u 1105 1038 11.28      
19 B3g 3255 3057 0.00      
20 B3g 1587 1490 0.00      
21 B3g 1391 1307 0.00      
22 B3g 715 672 0.00      
23 B3u 797 748 36.04      
24 B3u 415 390 26.26      

Unscaled Zero Point Vibrational Energy (zpe) 17006.9 cm-1
Scaled (by 0.9392) Zero Point Vibrational Energy (zpe) 15972.9 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/6-31+G**
ABC
0.21302 0.19619 0.10213

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.417
N2 0.000 0.000 -1.417
C3 0.000 1.136 0.698
C4 0.000 -1.136 0.698
C5 0.000 -1.136 -0.698
C6 0.000 1.136 -0.698
H7 0.000 2.065 1.254
H8 0.000 -2.065 1.254
H9 0.000 -2.065 -1.254
H10 0.000 2.065 -1.254

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.83321.34431.34432.40052.40052.07122.07123.37573.3757
N22.83322.40052.40051.34431.34433.37573.37572.07122.0712
C31.34432.40052.27212.66671.39601.08243.24883.74902.1616
C41.34432.40052.27211.39602.66673.24881.08242.16163.7490
C52.40051.34432.66671.39602.27213.74902.16161.08243.2488
C62.40051.34431.39602.66672.27212.16163.74903.24881.0824
H72.07123.37571.08243.24883.74902.16164.12964.83142.5078
H82.07123.37573.24881.08242.16163.74904.12962.50784.8314
H93.37572.07123.74902.16161.08243.24884.83142.50784.1296
H103.37572.07122.16163.74903.24881.08242.50784.83144.1296

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.316 N1 C3 H7 116.780
N1 C4 C5 122.316 N1 C4 H8 116.780
N2 C5 C4 122.316 N2 C5 H9 116.780
N2 C6 C3 122.316 N2 C6 H10 116.780
C3 N1 C4 115.368 C3 C6 H10 120.904
C4 C5 H9 120.904 C5 N2 C6 115.368
C5 C4 H8 120.904 C6 C3 H7 120.904
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability