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: CCD/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 CCD/6-31G**
 hartrees
Energy at 0K-263.551973
Energy at 298.15K-263.557896
HF Energy-262.687687
Nuclear repulsion energy208.565154
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 CCD/6-31G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Ag 3277 3073 0.00      
2 Ag 1693 1587 0.00      
3 Ag 1290 1209 0.00      
4 Ag 1064 998 0.00      
5 Ag 614 576 0.00      
6 Au 992 930 0.00      
7 Au 364 342 0.00      
8 B1g 960 900 0.00      
9 B1u 3256 3053 7.75      
10 B1u 1566 1469 1.84      
11 B1u 1192 1117 3.67      
12 B1u 1057 991 35.37      
13 B2g 974 913 0.00      
14 B2g 752 705 0.00      
15 B2u 3272 3067 58.11      
16 B2u 1484 1391 33.89      
17 B2u 1180 1107 12.50      
18 B2u 1124 1054 16.91      
19 B3g 3255 3052 0.00      
20 B3g 1637 1535 0.00      
21 B3g 1409 1321 0.00      
22 B3g 726 681 0.00      
23 B3u 818 767 22.25      
24 B3u 433 406 23.59      

Unscaled Zero Point Vibrational Energy (zpe) 17194.8 cm-1
Scaled (by 0.9376) Zero Point Vibrational Energy (zpe) 16121.8 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 CCD/6-31G**
ABC
0.21443 0.19700 0.10267

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.413
N2 0.000 0.000 -1.413
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 2.062 1.251
H8 0.000 -2.062 1.251
H9 0.000 -2.062 -1.251
H10 0.000 2.062 -1.251

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.82591.33881.33882.39472.39472.06852.06853.36863.3686
N22.82592.39472.39471.33881.33883.36863.36862.06852.0685
C31.33882.39472.26332.65881.39511.08253.24143.74122.1591
C41.33882.39472.26331.39512.65883.24141.08252.15913.7412
C52.39471.33882.65881.39512.26333.74122.15911.08253.2414
C62.39471.33881.39512.65882.26332.15913.74123.24141.0825
H72.06853.36861.08253.24143.74122.15914.12434.82362.5015
H82.06853.36863.24141.08252.15913.74124.12432.50154.8236
H93.36862.06853.74122.15911.08253.24144.82362.50154.1243
H103.36862.06852.15913.74123.24141.08252.50154.82364.1243

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.299 N1 C3 H7 116.968
N1 C4 C5 122.299 N1 C4 H8 116.968
N2 C5 C4 122.299 N2 C5 H9 116.968
N2 C6 C3 122.299 N2 C6 H10 116.968
C3 N1 C4 115.401 C3 C6 H10 120.733
C4 C5 H9 120.733 C5 N2 C6 115.401
C5 C4 H8 120.733 C6 C3 H7 120.733
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability