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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP4/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP4/3-21G
 hartrees
Energy at 0K-261.811955
Energy at 298.15K-261.817787
HF Energy-261.187773
Nuclear repulsion energy204.790881
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 MP4/3-21G
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 3182 3085        
2 Ag 1519 1473        
3 Ag 1248 1210        
4 Ag 966 937        
5 Ag 619 600        
6 Au 997 967        
7 Au 345 334        
8 B1g 946 918        
9 B1u 3156 3061        
10 B1u 1485 1440        
11 B1u 1140 1106        
12 B1u 976 947        
13 B2g 989 959        
14 B2g 775 752        
15 B2u 3172 3077        
16 B2u 1423 1380        
17 B2u 1091 1058        
18 B2u 1003 973        
19 B3g 3153 3057        
20 B3g 1449 1405        
21 B3g 1363 1322        
22 B3g 715 693        
23 B3u 803 779        
24 B3u 432 419        

Unscaled Zero Point Vibrational Energy (zpe) 16474.6 cm-1
Scaled (by 0.9698) Zero Point Vibrational Energy (zpe) 15977.1 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 MP4/3-21G
ABC
0.20384 0.19244 0.09899

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/3-21G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.432
N2 0.000 0.000 -1.432
C3 0.000 1.164 0.703
C4 0.000 -1.164 0.703
C5 0.000 -1.164 -0.703
C6 0.000 1.164 -0.703
H7 0.000 2.096 1.266
H8 0.000 -2.096 1.266
H9 0.000 -2.096 -1.266
H10 0.000 2.096 -1.266

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.86441.37341.37342.43142.43142.10232.10233.41613.4161
N22.86442.43142.43141.37341.37343.41613.41612.10232.1023
C31.37342.43142.32732.71871.40531.08883.30763.80752.1777
C41.37342.43142.32731.40532.71873.30761.08882.17773.8075
C52.43141.37342.71871.40532.32733.80752.17771.08883.3076
C62.43141.37341.40532.71872.32732.17773.80753.30761.0888
H72.10233.41611.08883.30763.80752.17774.19144.89632.5311
H82.10233.41613.30761.08882.17773.80754.19142.53114.8963
H93.41612.10233.80752.17771.08883.30764.89632.53114.1914
H103.41612.10232.17773.80753.30761.08882.53114.89634.1914

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.085 N1 C3 H7 116.786
N1 C4 C5 122.085 N1 C4 H8 116.786
N2 C5 C4 122.085 N2 C5 H9 116.786
N2 C6 C3 122.085 N2 C6 H10 116.786
C3 N1 C4 115.830 C3 C6 H10 121.129
C4 C5 H9 121.129 C5 N2 C6 115.830
C5 C4 H8 121.129 C6 C3 H7 121.129
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability