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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP2/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2/6-311G**
 hartrees
Energy at 0K-263.619887
Energy at 298.15K-263.625740
HF Energy-262.736125
Nuclear repulsion energy207.952992
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 MP2/6-311G**
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 3221 3061 0.00      
2 Ag 1617 1536 0.00      
3 Ag 1257 1195 0.00      
4 Ag 1029 977 0.00      
5 Ag 599 569 0.00      
6 Au 961 913 0.00      
7 Au 338 321 0.00      
8 B1g 939 893 0.00      
9 B1u 3202 3042 3.82      
10 B1u 1504 1429 2.28      
11 B1u 1162 1105 4.55      
12 B1u 1036 984 35.56      
13 B2g 962 915 0.00      
14 B2g 751 714 0.00      
15 B2u 3217 3056 51.44      
16 B2u 1442 1370 32.06      
17 B2u 1346 1279 0.00      
18 B2u 1088 1034 10.02      
19 B3g 3201 3042 0.00      
20 B3g 1564 1486 0.00      
21 B3g 1368 1300 0.00      
22 B3g 711 675 0.00      
23 B3u 798 759 30.97      
24 B3u 416 396 22.16      

Unscaled Zero Point Vibrational Energy (zpe) 16864.6 cm-1
Scaled (by 0.9502) Zero Point Vibrational Energy (zpe) 16024.7 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 MP2/6-311G**
ABC
0.21396 0.19519 0.10207

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311G**

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.421
N2 0.000 0.000 -1.421
C3 0.000 1.133 0.699
C4 0.000 -1.133 0.699
C5 0.000 -1.133 -0.699
C6 0.000 1.133 -0.699
H7 0.000 2.067 1.256
H8 0.000 -2.067 1.256
H9 0.000 -2.067 -1.256
H10 0.000 2.067 -1.256

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.84191.34301.34302.40362.40362.07332.07333.38163.3816
N22.84192.40362.40361.34301.34303.38163.38162.07332.0733
C31.34302.40362.26522.66201.39831.08733.24733.74922.1665
C41.34302.40362.26521.39832.66203.24731.08732.16653.7492
C52.40361.34302.66201.39832.26523.74922.16651.08733.2473
C62.40361.34301.39832.66202.26522.16653.74923.24731.0873
H72.07333.38161.08733.24733.74922.16654.13344.83642.5112
H82.07333.38163.24731.08732.16653.74924.13342.51124.8364
H93.38162.07333.74922.16651.08733.24734.83642.51124.1334
H103.38162.07332.16653.74923.24731.08732.51124.83644.1334

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.509 N1 C3 H7 116.709
N1 C4 C5 122.509 N1 C4 H8 116.709
N2 C5 C4 122.509 N2 C5 H9 116.709
N2 C6 C3 122.509 N2 C6 H10 116.709
C3 N1 C4 114.982 C3 C6 H10 120.783
C4 C5 H9 120.783 C5 N2 C6 114.982
C5 C4 H8 120.783 C6 C3 H7 120.783
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability