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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-263.534670
Energy at 298.15K-263.540532
HF Energy-262.686524
Nuclear repulsion energy208.026519
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 3273 3065 0.00      
2 Ag 1643 1539 0.00      
3 Ag 1277 1196 0.00      
4 Ag 1041 975 0.00      
5 Ag 604 565 0.00      
6 Au 969 908 0.00      
7 Au 343 321 0.00      
8 B1g 949 889 0.00      
9 B1u 3253 3047 6.50      
10 B1u 1533 1436 2.80      
11 B1u 1174 1100 2.76      
12 B1u 1039 973 36.17      
13 B2g 959 898 0.00      
14 B2g 742 695 0.00      
15 B2u 3268 3060 52.51      
16 B2u 1471 1378 31.41      
17 B2u 1364 1277 0.06      
18 B2u 1110 1039 12.47      
19 B3g 3252 3046 0.00      
20 B3g 1590 1489 0.00      
21 B3g 1394 1306 0.00      
22 B3g 717 671 0.00      
23 B3u 806 754 22.68      
24 B3u 423 396 23.69      

Unscaled Zero Point Vibrational Energy (zpe) 17096.4 cm-1
Scaled (by 0.9365) Zero Point Vibrational Energy (zpe) 16010.8 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
0.21322 0.19607 0.10214

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 1.418
N2 0.000 0.000 -1.418
C3 0.000 1.135 0.698
C4 0.000 -1.135 0.698
C5 0.000 -1.135 -0.698
C6 0.000 1.135 -0.698
H7 0.000 2.065 1.253
H8 0.000 -2.065 1.253
H9 0.000 -2.065 -1.253
H10 0.000 2.065 -1.253

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.83521.34431.34432.40072.40072.07192.07193.37633.3763
N22.83522.40072.40071.34431.34433.37633.37632.07192.0719
C31.34432.40072.27052.66501.39531.08343.24853.74842.1613
C41.34432.40072.27051.39532.66503.24851.08342.16133.7484
C52.40071.34432.66501.39532.27053.74842.16131.08343.2485
C62.40071.34431.39532.66502.27052.16133.74843.24851.0834
H72.07193.37631.08343.24853.74842.16134.13074.83182.5066
H82.07193.37633.24851.08342.16133.74844.13072.50664.8318
H93.37632.07193.74842.16131.08343.24854.83182.50664.1307
H103.37632.07192.16133.74843.24851.08342.50664.83184.1307

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.381 N1 C3 H7 116.765
N1 C4 C5 122.381 N1 C4 H8 116.765
N2 C5 C4 122.381 N2 C5 H9 116.765
N2 C6 C3 122.381 N2 C6 H10 116.765
C3 N1 C4 115.238 C3 C6 H10 120.854
C4 C5 H9 120.854 C5 N2 C6 115.238
C5 C4 H8 120.854 C6 C3 H7 120.854
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability