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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: CISD/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 CISD/6-31G*
 hartrees
Energy at 0K-263.376192
Energy at 298.15K-263.382251
HF Energy-262.682508
Nuclear repulsion energy209.958522
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 CISD/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 3333 3086 0.00      
2 Ag 1750 1621 0.00      
3 Ag 1327 1228 0.00      
4 Ag 1104 1022 0.00      
5 Ag 633 586 0.00      
6 Au 1051 973 0.00      
7 Au 390 361 0.00      
8 B1g 1002 928 0.00      
9 B1u 3311 3065 6.11      
10 B1u 1614 1494 2.17      
11 B1u 1229 1138 7.28      
12 B1u 1085 1004 38.18      
13 B2g 1029 953 0.00      
14 B2g 796 737 0.00      
15 B2u 3327 3080 55.31      
16 B2u 1526 1413 41.88      
17 B2u 1202 1113 9.93      
18 B2u 1152 1067 29.06      
19 B3g 3310 3064 0.00      
20 B3g 1708 1581 0.00      
21 B3g 1449 1342 0.00      
22 B3g 751 696 0.00      
23 B3u 855 792 26.93      
24 B3u 458 424 26.62      

Unscaled Zero Point Vibrational Energy (zpe) 17695.2 cm-1
Scaled (by 0.9258) Zero Point Vibrational Energy (zpe) 16382.2 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 CISD/6-31G*
ABC
0.21667 0.20033 0.10409

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.398
N2 0.000 0.000 -1.398
C3 0.000 1.126 0.694
C4 0.000 -1.126 0.694
C5 0.000 -1.126 -0.694
C6 0.000 1.126 -0.694
H7 0.000 2.053 1.249
H8 0.000 -2.053 1.249
H9 0.000 -2.053 -1.249
H10 0.000 2.053 -1.249

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.79601.32761.32762.37572.37572.05802.05803.34993.3499
N22.79602.37572.37571.32761.32763.34993.34992.05802.0580
C31.32762.37572.25132.64481.38811.08063.22643.72532.1531
C41.32762.37572.25131.38812.64483.22641.08062.15313.7253
C52.37571.32762.64481.38812.25133.72532.15311.08063.2264
C62.37571.32761.38812.64482.25132.15313.72533.22641.0806
H72.05803.34991.08063.22643.72532.15314.10534.80582.4986
H82.05803.34993.22641.08062.15313.72534.10532.49864.8058
H93.34992.05803.72532.15311.08063.22644.80582.49864.1053
H103.34992.05802.15313.72533.22641.08062.49864.80584.1053

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.021 N1 C3 H7 117.058
N1 C4 C5 122.021 N1 C4 H8 117.058
N2 C5 C4 122.021 N2 C5 H9 117.058
N2 C6 C3 122.021 N2 C6 H10 117.058
C3 N1 C4 115.958 C3 C6 H10 120.921
C4 C5 H9 120.921 C5 N2 C6 115.958
C5 C4 H8 120.921 C6 C3 H7 120.921
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability