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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: CCD/6-31+G**

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/6-31+G**
 hartrees
Energy at 0K-263.566492
Energy at 298.15K-263.572361
HF Energy-262.695092
Nuclear repulsion energy208.381806
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/6-31+G**
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 3278 3088 0.00      
2 Ag 1683 1586 0.00      
3 Ag 1286 1212 0.00      
4 Ag 1059 997 0.00      
5 Ag 615 579 0.00      
6 Au 967 911 0.00      
7 Au 353 333 0.00      
8 B1g 947 893 0.00      
9 B1u 3258 3070 2.56      
10 B1u 1558 1468 0.37      
11 B1u 1188 1120 6.68      
12 B1u 1054 993 27.40      
13 B2g 938 884 0.00      
14 B2g 708 667 0.00      
15 B2u 3273 3084 50.86      
16 B2u 1477 1392 35.04      
17 B2u 1182 1114 17.99      
18 B2u 1119 1054 16.00      
19 B3g 3257 3069 0.00      
20 B3g 1631 1537 0.00      
21 B3g 1405 1324 0.00      
22 B3g 724 682 0.00      
23 B3u 806 760 35.25      
24 B3u 425 401 25.66      

Unscaled Zero Point Vibrational Energy (zpe) 17094.7 cm-1
Scaled (by 0.9423) Zero Point Vibrational Energy (zpe) 16108.3 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/6-31+G**
ABC
0.21398 0.19668 0.10248

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

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 1.133 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 2.063 1.252
H8 0.000 -2.063 1.252
H9 0.000 -2.063 -1.252
H10 0.000 2.063 -1.252

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.82731.33991.33992.39692.39692.06932.06933.37103.3710
N22.82732.39692.39691.33991.33993.37103.37102.06932.0693
C31.33992.39692.26612.66211.39701.08243.24373.74442.1611
C41.33992.39692.26611.39702.66213.24371.08242.16113.7444
C52.39691.33992.66211.39702.26613.74442.16111.08243.2437
C62.39691.33991.39702.66212.26612.16113.74443.24371.0824
H72.06933.37101.08243.24373.74442.16114.12614.82672.5046
H82.06933.37103.24371.08242.16113.74444.12612.50464.8267
H93.37102.06933.74442.16111.08243.24374.82672.50464.1261
H103.37102.06932.16113.74443.24371.08242.50464.82674.1261

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.259 N1 C3 H7 116.969
N1 C4 C5 122.259 N1 C4 H8 116.969
N2 C5 C4 122.259 N2 C5 H9 116.969
N2 C6 C3 122.259 N2 C6 H10 116.969
C3 N1 C4 115.483 C3 C6 H10 120.772
C4 C5 H9 120.772 C5 N2 C6 115.483
C5 C4 H8 120.772 C6 C3 H7 120.772
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability