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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP3=FULL/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 MP3=FULL/6-31G*
 hartrees
Energy at 0K-263.544251
Energy at 298.15K-263.550173
HF Energy-262.680852
Nuclear repulsion energy208.711419
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 MP3=FULL/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 3261 3060 0.00      
2 Ag 1696 1591 0.00      
3 Ag 1295 1215 0.00      
4 Ag 1071 1005 0.00      
5 Ag 619 581 0.00      
6 Au 988 927 0.00      
7 Au 368 345 0.00      
8 B1g 960 901 0.00      
9 B1u 3241 3041 5.50      
10 B1u 1568 1472 3.12      
11 B1u 1196 1123 5.45      
12 B1u 1060 995 37.41      
13 B2g 969 909 0.00      
14 B2g 761 714 0.00      
15 B2u 3256 3055 48.98      
16 B2u 1487 1396 38.14      
17 B2u 1172 1099 14.30      
18 B2u 1130 1060 16.17      
19 B3g 3240 3040 0.00      
20 B3g 1640 1539 0.00      
21 B3g 1411 1324 0.00      
22 B3g 731 686 0.00      
23 B3u 817 767 28.09      
24 B3u 436 409 24.55      

Unscaled Zero Point Vibrational Energy (zpe) 17186.3 cm-1
Scaled (by 0.9383) Zero Point Vibrational Energy (zpe) 16125.9 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 MP3=FULL/6-31G*
ABC
0.21472 0.19741 0.10285

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP3=FULL/6-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.406
N2 0.000 0.000 -1.406
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
N12.81251.33601.33602.39042.39042.07212.07213.37043.3704
N22.81252.39042.39041.33601.33603.37043.37042.07212.0721
C31.33602.39042.26642.66231.39701.08743.24813.74962.1661
C41.33602.39042.26641.39702.66233.24811.08742.16613.7496
C52.39041.33602.66231.39702.26643.74962.16611.08743.2481
C62.39041.33601.39702.66232.26642.16613.74963.24811.0874
H72.07213.37041.08743.24813.74962.16614.13334.83692.5124
H82.07213.37043.24811.08742.16613.74964.13332.51244.8369
H93.37042.07213.74962.16611.08743.24814.83692.51244.1333
H103.37042.07212.16613.74963.24811.08742.51244.83694.1333

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.987 N1 C3 H7 117.157
N1 C4 C5 121.987 N1 C4 H8 117.157
N2 C5 C4 121.987 N2 C5 H9 117.157
N2 C6 C3 121.987 N2 C6 H10 117.157
C3 N1 C4 116.025 C3 C6 H10 120.855
C4 C5 H9 120.855 C5 N2 C6 116.025
C5 C4 H8 120.855 C6 C3 H7 120.855
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability