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: HSEh1PBE/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at HSEh1PBE/3-21G
 hartrees
Energy at 0K-262.558775
Energy at 298.15K-262.564765
HF Energy-262.558775
Nuclear repulsion energy207.888315
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 HSEh1PBE/3-21G
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 3243 3124 0.00      
2 Ag 1588 1530 0.00      
3 Ag 1278 1231 0.00      
4 Ag 1041 1003 0.00      
5 Ag 630 607 0.00      
6 Au 1063 1024 0.00      
7 Au 350 337 0.00      
8 B1g 984 948 0.00      
9 B1u 3218 3100 9.89      
10 B1u 1517 1461 18.54      
11 B1u 1175 1132 0.11      
12 B1u 1025 987 31.11      
13 B2g 1059 1020 0.00      
14 B2g 815 785 0.00      
15 B2u 3233 3115 45.74      
16 B2u 1454 1401 30.87      
17 B2u 1203 1159 2.36      
18 B2u 1096 1055 8.97      
19 B3g 3214 3096 0.00      
20 B3g 1542 1485 0.00      
21 B3g 1405 1354 0.00      
22 B3g 737 710 0.00      
23 B3u 838 808 42.64      
24 B3u 453 436 23.96      

Unscaled Zero Point Vibrational Energy (zpe) 17079.9 cm-1
Scaled (by 0.9633) Zero Point Vibrational Energy (zpe) 16453.1 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 HSEh1PBE/3-21G
ABC
0.20954 0.19905 0.10208

See section I.F.4 to change rotational constant units
Geometric Data calculated at HSEh1PBE/3-21G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.403
N2 0.000 0.000 -1.403
C3 0.000 1.146 0.695
C4 0.000 -1.146 0.695
C5 0.000 -1.146 -0.695
C6 0.000 1.146 -0.695
H7 0.000 2.076 1.253
H8 0.000 -2.076 1.253
H9 0.000 -2.076 -1.253
H10 0.000 2.076 -1.253

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.80681.34751.34752.39142.39142.08102.08103.37103.3710
N22.80682.39142.39141.34751.34753.37103.37102.08102.0810
C31.34752.39142.29282.68161.39061.08363.26993.76522.1584
C41.34752.39142.29281.39062.68163.26991.08362.15843.7652
C52.39141.34752.68161.39062.29283.76522.15841.08363.2699
C62.39141.34751.39062.68162.29282.15843.76523.26991.0836
H72.08103.37101.08363.26993.76522.15844.15114.84882.5058
H82.08103.37103.26991.08362.15843.76524.15112.50584.8488
H93.37102.08103.76522.15841.08363.26994.84882.50584.1511
H103.37102.08102.15843.76523.26991.08362.50584.84884.1511

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.703 N1 C3 H7 117.329
N1 C4 C5 121.703 N1 C4 H8 117.329
N2 C5 C4 121.703 N2 C5 H9 117.329
N2 C6 C3 121.703 N2 C6 H10 117.329
C3 N1 C4 116.595 C3 C6 H10 120.968
C4 C5 H9 120.968 C5 N2 C6 116.595
C5 C4 H8 120.968 C6 C3 H7 120.968
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability