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: CID/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 CID/6-31G*
 hartrees
Energy at 0K-263.372902
Energy at 298.15K-263.378964
HF Energy-262.682560
Nuclear repulsion energy210.033277
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 CID/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 3335 3081 0.00      
2 Ag 1754 1620 0.00      
3 Ag 1328 1227 0.00      
4 Ag 1106 1022 0.00      
5 Ag 633 585 0.00      
6 Au 1051 971 0.00      
7 Au 391 361 0.00      
8 B1g 1002 926 0.00      
9 B1u 3313 3061 5.84      
10 B1u 1616 1493 2.17      
11 B1u 1231 1137 7.39      
12 B1u 1086 1003 38.50      
13 B2g 1029 950 0.00      
14 B2g 797 736 0.00      
15 B2u 3329 3075 54.04      
16 B2u 1528 1412 42.34      
17 B2u 1207 1115 10.85      
18 B2u 1155 1067 27.80      
19 B3g 3312 3060 0.00      
20 B3g 1711 1581 0.00      
21 B3g 1450 1339 0.00      
22 B3g 752 695 0.00      
23 B3u 855 790 26.95      
24 B3u 459 424 26.77      

Unscaled Zero Point Vibrational Energy (zpe) 17714.8 cm-1
Scaled (by 0.9237) Zero Point Vibrational Energy (zpe) 16363.2 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 CID/6-31G*
ABC
0.21680 0.20050 0.10417

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.397
N2 0.000 0.000 -1.397
C3 0.000 1.125 0.694
C4 0.000 -1.125 0.694
C5 0.000 -1.125 -0.694
C6 0.000 1.125 -0.694
H7 0.000 2.052 1.249
H8 0.000 -2.052 1.249
H9 0.000 -2.052 -1.249
H10 0.000 2.052 -1.249

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.79471.32711.32712.37472.37472.05752.05753.34883.3488
N22.79472.37472.37471.32711.32713.34883.34882.05752.0575
C31.32712.37472.25052.64391.38761.08043.22563.72432.1526
C41.32712.37472.25051.38762.64393.22561.08042.15263.7243
C52.37471.32712.64391.38762.25053.72432.15261.08043.2256
C62.37471.32711.38762.64392.25052.15263.72433.22561.0804
H72.05753.34881.08043.22563.72432.15264.10434.80472.4980
H82.05753.34883.22561.08042.15263.72434.10432.49804.8047
H93.34882.05753.72432.15261.08043.22564.80472.49804.1043
H103.34882.05752.15263.72433.22561.08042.49804.80474.1043

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.015 N1 C3 H7 117.064
N1 C4 C5 122.015 N1 C4 H8 117.064
N2 C5 C4 122.015 N2 C5 H9 117.064
N2 C6 C3 122.015 N2 C6 H10 117.064
C3 N1 C4 115.971 C3 C6 H10 120.921
C4 C5 H9 120.921 C5 N2 C6 115.971
C5 C4 H8 120.921 C6 C3 H7 120.921
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability