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: MP3/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP3/6-31G*
 hartrees
Energy at 0K-263.518014
Energy at 298.15K-263.523919
HF Energy-262.680536
Nuclear repulsion energy208.512754
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 MP3/6-31G*
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 3260 3060 0.00      
2 Ag 1694 1590 0.00      
3 Ag 1294 1214 0.00      
4 Ag 1069 1003 0.00      
5 Ag 618 580 0.00      
6 Au 980 920 0.00      
7 Au 366 344 0.00      
8 B1g 956 897 0.00      
9 B1u 3240 3041 5.47      
10 B1u 1566 1470 3.11      
11 B1u 1195 1121 5.47      
12 B1u 1058 993 37.22      
13 B2g 961 902 0.00      
14 B2g 754 708 0.00      
15 B2u 3255 3056 48.93      
16 B2u 1485 1394 38.02      
17 B2u 1168 1096 14.46      
18 B2u 1128 1059 16.49      
19 B3g 3239 3040 0.00      
20 B3g 1637 1537 0.00      
21 B3g 1409 1323 0.00      
22 B3g 729 684 0.00      
23 B3u 813 763 28.46      
24 B3u 433 406 24.41      

Unscaled Zero Point Vibrational Energy (zpe) 17152.5 cm-1
Scaled (by 0.9386) Zero Point Vibrational Energy (zpe) 16099.4 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 MP3/6-31G*
ABC
0.21442 0.19692 0.10265

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP3/6-31G*

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 1.131 0.698
C4 0.000 -1.131 0.698
C5 0.000 -1.131 -0.698
C6 0.000 1.131 -0.698
H7 0.000 2.064 1.255
H8 0.000 -2.064 1.255
H9 0.000 -2.064 -1.255
H10 0.000 2.064 -1.255

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.82581.33861.33862.39462.39462.07032.07033.37293.3729
N22.82582.39462.39461.33861.33863.37293.37292.07032.0703
C31.33862.39462.26282.65831.39511.08653.24383.74472.1636
C41.33862.39462.26281.39512.65833.24381.08652.16363.7447
C52.39461.33862.65831.39512.26283.74472.16361.08653.2438
C62.39461.33861.39512.65832.26282.16363.74473.24381.0865
H72.07033.37291.08653.24383.74472.16364.12844.83122.5093
H82.07033.37293.24381.08652.16363.74474.12842.50934.8312
H93.37292.07033.74472.16361.08653.24384.83122.50934.1284
H103.37292.07032.16363.74473.24381.08652.50934.83124.1284

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.304 N1 C3 H7 116.847
N1 C4 C5 122.304 N1 C4 H8 116.847
N2 C5 C4 122.304 N2 C5 H9 116.847
N2 C6 C3 122.304 N2 C6 H10 116.847
C3 N1 C4 115.391 C3 C6 H10 120.849
C4 C5 H9 120.849 C5 N2 C6 115.391
C5 C4 H8 120.849 C6 C3 H7 120.849
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability