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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP2/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2/6-31G
 hartrees
Energy at 0K-263.121865
Energy at 298.15K-263.127661
HF Energy-262.547705
Nuclear repulsion energy204.728914
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 MP2/6-31G
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 3240 3100 0.00      
2 Ag 1567 1500 0.00      
3 Ag 1268 1213 0.00      
4 Ag 990 947 0.00      
5 Ag 616 589 0.00      
6 Au 940 899 0.00      
7 Au 337 323 0.00      
8 B1g 928 888 0.00      
9 B1u 3217 3078 9.09      
10 B1u 1494 1430 13.26      
11 B1u 1147 1097 0.00      
12 B1u 1003 960 26.26      
13 B2g 931 891 0.00      
14 B2g 735 703 0.00      
15 B2u 3232 3092 47.78      
16 B2u 1437 1375 29.60      
17 B2u 1217 1164 7.32      
18 B2u 1082 1035 9.70      
19 B3g 3213 3075 0.00      
20 B3g 1496 1432 0.00      
21 B3g 1383 1323 0.00      
22 B3g 712 681 0.00      
23 B3u 787 753 33.63      
24 B3u 425 406 29.42      

Unscaled Zero Point Vibrational Energy (zpe) 16698.2 cm-1
Scaled (by 0.9568) Zero Point Vibrational Energy (zpe) 15976.8 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 MP2/6-31G
ABC
0.20380 0.19220 0.09891

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.431
N2 0.000 0.000 -1.431
C3 0.000 1.165 0.704
C4 0.000 -1.165 0.704
C5 0.000 -1.165 -0.704
C6 0.000 1.165 -0.704
H7 0.000 2.091 1.275
H8 0.000 -2.091 1.275
H9 0.000 -2.091 -1.275
H10 0.000 2.091 -1.275

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.86241.37301.37302.43212.43212.09632.09633.41973.4197
N22.86242.43212.43211.37301.37303.41973.41972.09632.0963
C31.37302.43212.32922.72171.40801.08793.30483.80962.1850
C41.37302.43212.32921.40802.72173.30481.08792.18503.8096
C52.43211.37302.72171.40802.32923.80962.18501.08793.3048
C62.43211.37301.40802.72172.32922.18503.80963.30481.0879
H72.09633.41971.08793.30483.80962.18504.18104.89742.5502
H82.09633.41973.30481.08792.18503.80964.18102.55024.8974
H93.41972.09633.80962.18501.08793.30484.89742.55024.1810
H103.41972.09632.18503.80963.30481.08792.55024.89744.1810

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.981 N1 C3 H7 116.354
N1 C4 C5 121.981 N1 C4 H8 116.354
N2 C5 C4 121.981 N2 C5 H9 116.354
N2 C6 C3 121.981 N2 C6 H10 116.354
C3 N1 C4 116.039 C3 C6 H10 121.665
C4 C5 H9 121.665 C5 N2 C6 116.039
C5 C4 H8 121.665 C6 C3 H7 121.665
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability