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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: MP2/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-263.787654
Energy at 298.15K-263.793564
HF Energy-262.767711
Nuclear repulsion energy208.676379
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/cc-pVTZ
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 3223 3061 0.00      
2 Ag 1617 1535 0.00      
3 Ag 1255 1192 0.00      
4 Ag 1031 979 0.00      
5 Ag 598 568 0.00      
6 Au 1002 951 0.00      
7 Au 350 332 0.00      
8 B1g 952 904 0.00      
9 B1u 3203 3042 2.15      
10 B1u 1507 1431 1.75      
11 B1u 1163 1104 3.53      
12 B1u 1035 983 37.38      
13 B2g 993 943 0.00      
14 B2g 776 737 0.00      
15 B2u 3219 3056 44.53      
16 B2u 1449 1376 31.03      
17 B2u 1361 1292 0.13      
18 B2u 1089 1034 11.22      
19 B3g 3202 3040 0.00      
20 B3g 1565 1486 0.00      
21 B3g 1370 1301 0.00      
22 B3g 709 673 0.00      
23 B3u 811 770 29.66      
24 B3u 425 403 23.44      

Unscaled Zero Point Vibrational Energy (zpe) 16952.1 cm-1
Scaled (by 0.9495) Zero Point Vibrational Energy (zpe) 16096.1 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 MP2/cc-pVTZ
ABC
0.21481 0.19711 0.10279

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/cc-pVTZ

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.414
N2 0.000 0.000 -1.414
C3 0.000 1.130 0.696
C4 0.000 -1.130 0.696
C5 0.000 -1.130 -0.696
C6 0.000 1.130 -0.696
H7 0.000 2.061 1.249
H8 0.000 -2.061 1.249
H9 0.000 -2.061 -1.249
H10 0.000 2.061 -1.249

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.82741.33891.33892.39372.39372.06802.06803.36713.3671
N22.82742.39372.39371.33891.33893.36713.36712.06802.0680
C31.33892.39372.26102.65541.39251.08253.23943.73772.1561
C41.33892.39372.26101.39252.65543.23941.08252.15613.7377
C52.39371.33892.65541.39252.26103.73772.15611.08253.2394
C62.39371.33891.39252.65542.26102.15613.73773.23941.0825
H72.06803.36711.08253.23943.73772.15614.12294.82012.4972
H82.06803.36713.23941.08252.15613.73774.12292.49724.8201
H93.36712.06803.73772.15611.08253.23944.82012.49724.1229
H103.36712.06802.15613.73773.23941.08252.49724.82014.1229

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.401 N1 C3 H7 116.918
N1 C4 C5 122.401 N1 C4 H8 116.918
N2 C5 C4 122.401 N2 C5 H9 116.918
N2 C6 C3 122.401 N2 C6 H10 116.918
C3 N1 C4 115.199 C3 C6 H10 120.681
C4 C5 H9 120.681 C5 N2 C6 115.199
C5 C4 H8 120.681 C6 C3 H7 120.681
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability