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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: CISD/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at CISD/3-21G
 hartrees
Energy at 0K-261.690159
Energy at 298.15K-261.696252
Nuclear repulsion energy207.799199
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 CISD/3-21G
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 3306 3112 0.00      
2 Ag 1637 1541 0.00      
3 Ag 1313 1236 0.00      
4 Ag 1056 994 0.00      
5 Ag 650 612 0.00      
6 Au 1084 1021 0.00      
7 Au 393 370 0.00      
8 B1g 1014 954 0.00      
9 B1u 3279 3086 11.16      
10 B1u 1567 1475 16.57      
11 B1u 1199 1129 0.41      
12 B1u 1057 995 35.70      
13 B2g 1072 1009 0.00      
14 B2g 826 777 0.00      
15 B2u 3295 3102 39.82      
16 B2u 1493 1406 29.50      
17 B2u 1134 1068 19.24      
18 B2u 1047 985 2.23      
19 B3g 3275 3082 0.00      
20 B3g 1573 1480 0.00      
21 B3g 1445 1360 0.00      
22 B3g 756 711 0.00      
23 B3u 862 812 36.47      
24 B3u 471 443 26.91      

Unscaled Zero Point Vibrational Energy (zpe) 17401.2 cm-1
Scaled (by 0.9413) Zero Point Vibrational Energy (zpe) 16379.8 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 CISD/3-21G
ABC
0.20869 0.19937 0.10196

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/3-21G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.401
N2 0.000 0.000 -1.401
C3 0.000 1.150 0.696
C4 0.000 -1.150 0.696
C5 0.000 -1.150 -0.696
C6 0.000 1.150 -0.696
H7 0.000 2.073 1.254
H8 0.000 -2.073 1.254
H9 0.000 -2.073 -1.254
H10 0.000 2.073 -1.254

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.80241.34891.34892.39142.39142.07832.07833.36843.3684
N22.80242.39142.39141.34891.34893.36843.36842.07832.0783
C31.34892.39142.29952.68771.39151.07883.27083.76662.1571
C41.34892.39142.29951.39152.68773.27081.07882.15713.7666
C52.39141.34892.68771.39152.29953.76662.15711.07883.2708
C62.39141.34891.39152.68772.29952.15713.76663.27081.0788
H72.07833.36841.07883.27083.76662.15714.14614.84542.5075
H82.07833.36843.27081.07882.15713.76664.14612.50754.8454
H93.36842.07833.76662.15711.07883.27084.84542.50754.1461
H103.36842.07832.15713.76663.27081.07882.50754.84544.1461

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.532 N1 C3 H7 117.322
N1 C4 C5 121.532 N1 C4 H8 117.322
N2 C5 C4 121.532 N2 C5 H9 117.322
N2 C6 C3 121.532 N2 C6 H10 117.322
C3 N1 C4 116.937 C3 C6 H10 121.147
C4 C5 H9 121.147 C5 N2 C6 116.937
C5 C4 H8 121.147 C6 C3 H7 121.147
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability