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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: CCD/6-31G*

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/6-31G*
 hartrees
Energy at 0K-263.519941
Energy at 298.15K-263.525840
HF Energy-262.680228
Nuclear repulsion energy208.380821
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/6-31G*
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 3233 3060 0.00      
2 Ag 1687 1597 0.00      
3 Ag 1288 1219 0.00      
4 Ag 1064 1007 0.00      
5 Ag 615 582 0.00      
6 Au 980 928 0.00      
7 Au 365 345 0.00      
8 B1g 951 900 0.00      
9 B1u 3212 3041 6.61      
10 B1u 1558 1475 2.89      
11 B1u 1190 1127 4.33      
12 B1u 1057 1000 37.45      
13 B2g 961 909 0.00      
14 B2g 756 716 0.00      
15 B2u 3227 3055 53.26      
16 B2u 1479 1400 36.59      
17 B2u 1178 1115 13.51      
18 B2u 1125 1064 15.10      
19 B3g 3211 3040 0.00      
20 B3g 1634 1547 0.00      
21 B3g 1403 1328 0.00      
22 B3g 727 688 0.00      
23 B3u 810 767 27.22      
24 B3u 434 410 24.34      

Unscaled Zero Point Vibrational Energy (zpe) 17072.2 cm-1
Scaled (by 0.9465) Zero Point Vibrational Energy (zpe) 16158.8 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/6-31G*
ABC
0.21404 0.19682 0.10253

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.413
N2 0.000 0.000 -1.413
C3 0.000 1.132 0.698
C4 0.000 -1.132 0.698
C5 0.000 -1.132 -0.698
C6 0.000 1.132 -0.698
H7 0.000 2.067 1.256
H8 0.000 -2.067 1.256
H9 0.000 -2.067 -1.256
H10 0.000 2.067 -1.256

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.82611.33931.33932.39532.39532.07272.07273.37603.3760
N22.82612.39532.39531.33931.33933.37603.37602.07272.0727
C31.33932.39532.26462.66001.39551.08873.24753.74872.1661
C41.33932.39532.26461.39552.66003.24751.08872.16613.7487
C52.39531.33932.66001.39552.26463.74872.16611.08873.2475
C62.39531.33931.39552.66002.26462.16613.74873.24751.0887
H72.07273.37601.08873.24753.74872.16614.13364.83742.5127
H82.07273.37603.24751.08872.16613.74874.13362.51274.8374
H93.37602.07273.74872.16611.08873.24754.83742.51274.1336
H103.37602.07272.16613.74873.24751.08872.51274.83744.1336

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.281 N1 C3 H7 116.849
N1 C4 C5 122.281 N1 C4 H8 116.849
N2 C5 C4 122.281 N2 C5 H9 116.849
N2 C6 C3 122.281 N2 C6 H10 116.849
C3 N1 C4 115.438 C3 C6 H10 120.870
C4 C5 H9 120.870 C5 N2 C6 115.438
C5 C4 H8 120.870 C6 C3 H7 120.870
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability