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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP2/CEP-121G

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/CEP-121G
 hartrees
Energy at 0K-44.053250
Energy at 298.15K-44.058846
HF Energy-43.486359
Nuclear repulsion energy102.789100
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/CEP-121G
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 3106 0.00      
2 Ag 1524 1487 0.00      
3 Ag 1231 1201 0.00      
4 Ag 946 923 0.00      
5 Ag 596 582 0.00      
6 Au 709 692 0.00      
7 Au 302 294 0.00      
8 B1g 887 866 0.00      
9 B1u 3159 3083 6.19      
10 B1u 1454 1420 9.36      
11 B1u 1117 1090 0.61      
12 B1u 979 956 22.70      
13 B2g 833 813 0.00      
14 B2g 708 691 0.00      
15 B2u 3175 3099 66.27      
16 B2u 1397 1363 34.13      
17 B2u 1179 1151 11.32      
18 B2u 1043 1018 7.17      
19 B3g 3156 3080 0.00      
20 B3g 1463 1428 0.00      
21 B3g 1353 1320 0.00      
22 B3g 688 672 0.00      
23 B3u 759 741 46.93      
24 B3u 413 403 27.45      

Unscaled Zero Point Vibrational Energy (zpe) 16124.6 cm-1
Scaled (by 0.976) Zero Point Vibrational Energy (zpe) 15737.6 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/CEP-121G
ABC
0.20083 0.18665 0.09674

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.453
N2 0.000 0.000 -1.453
C3 0.000 1.174 0.714
C4 0.000 -1.174 0.714
C5 0.000 -1.174 -0.714
C6 0.000 1.174 -0.714
H7 0.000 2.102 1.287
H8 0.000 -2.102 1.287
H9 0.000 -2.102 -1.287
H10 0.000 2.102 -1.287

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.90641.38691.38692.46492.46492.10892.10893.45383.4538
N22.90642.46492.46491.38691.38693.45383.45382.10892.1089
C31.38692.46492.34732.74801.42871.09113.32573.83902.2064
C41.38692.46492.34731.42872.74803.32571.09112.20643.8390
C52.46491.38692.74801.42872.34733.83902.20641.09113.3257
C62.46491.38691.42872.74802.34732.20643.83903.32571.0911
H72.10893.45381.09113.32573.83902.20644.20474.93012.5741
H82.10893.45383.32571.09112.20643.83904.20472.57414.9301
H93.45382.10893.83902.20641.09113.32574.93012.57414.2047
H103.45382.10892.20643.83903.32571.09112.57414.93014.2047

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.192 N1 C3 H7 116.146
N1 C4 C5 122.192 N1 C4 H8 116.146
N2 C5 C4 122.192 N2 C5 H9 116.146
N2 C6 C3 122.192 N2 C6 H10 116.146
C3 N1 C4 115.617 C3 C6 H10 121.662
C4 C5 H9 121.662 C5 N2 C6 115.617
C5 C4 H8 121.662 C6 C3 H7 121.662
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability