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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: CCD/cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at CCD/cc-pVDZ
 hartrees
Energy at 0K-263.558922
Energy at 298.15K-263.564858
HF Energy-262.700499
Nuclear repulsion energy207.489214
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 CCD/cc-pVDZ
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 3230 3090 0.00      
2 Ag 1678 1605 0.00      
3 Ag 1264 1209 0.00      
4 Ag 1055 1009 0.00      
5 Ag 608 581 0.00      
6 Au 1007 963 0.00      
7 Au 368 352 0.00      
8 B1g 955 914 0.00      
9 B1u 3208 3069 5.82      
10 B1u 1540 1473 1.16      
11 B1u 1177 1126 4.04      
12 B1u 1051 1005 36.49      
13 B2g 989 947 0.00      
14 B2g 768 735 0.00      
15 B2u 3225 3085 52.84      
16 B2u 1455 1392 35.52      
17 B2u 1175 1124 14.36      
18 B2u 1104 1056 11.91      
19 B3g 3207 3068 0.00      
20 B3g 1617 1547 0.00      
21 B3g 1375 1315 0.00      
22 B3g 718 687 0.00      
23 B3u 814 779 26.38      
24 B3u 431 412 20.12      

Unscaled Zero Point Vibrational Energy (zpe) 17008.0 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 16271.5 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 CCD/cc-pVDZ
ABC
0.21359 0.19393 0.10164

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.425
N2 0.000 0.000 -1.425
C3 0.000 1.132 0.702
C4 0.000 -1.132 0.702
C5 0.000 -1.132 -0.702
C6 0.000 1.132 -0.702
H7 0.000 2.077 1.258
H8 0.000 -2.077 1.258
H9 0.000 -2.077 -1.258
H10 0.000 2.077 -1.258

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.85031.34341.34342.40982.40982.08382.08383.39353.3935
N22.85032.40982.40981.34341.34343.39353.39352.08382.0838
C31.34342.40982.26442.66451.40421.09653.25723.76072.1763
C41.34342.40982.26441.40422.66453.25721.09652.17633.7607
C52.40981.34342.66451.40422.26443.76072.17631.09653.2572
C62.40981.34341.40422.66452.26442.17633.76073.25721.0965
H72.08383.39351.09653.25723.76072.17634.15424.85712.5168
H82.08383.39353.25721.09652.17633.76074.15422.51684.8571
H93.39352.08383.76072.17631.09653.25724.85712.51684.1542
H103.39352.08382.17633.76073.25721.09652.51684.85714.1542

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.563 N1 C3 H7 116.951
N1 C4 C5 122.563 N1 C4 H8 116.951
N2 C5 C4 122.563 N2 C5 H9 116.951
N2 C6 C3 122.563 N2 C6 H10 116.951
C3 N1 C4 114.874 C3 C6 H10 120.486
C4 C5 H9 120.486 C5 N2 C6 114.874
C5 C4 H8 120.486 C6 C3 H7 120.486
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability