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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: BLYP/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 BLYP/cc-pVDZ
 hartrees
Energy at 0K-264.239648
Energy at 298.15K-264.245395
Nuclear repulsion energy206.326280
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 BLYP/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 3079 3084 0.00      
2 Ag 1551 1553 0.00      
3 Ag 1208 1210 0.00      
4 Ag 1001 1002 0.00      
5 Ag 590 591 0.00      
6 Au 959 960 0.00      
7 Au 320 320 0.00      
8 B1g 909 911 0.00      
9 B1u 3057 3062 12.74      
10 B1u 1453 1455 1.24      
11 B1u 1123 1125 2.63      
12 B1u 997 998 35.68      
13 B2g 949 951 0.00      
14 B2g 751 752 0.00      
15 B2u 3073 3078 90.83      
16 B2u 1389 1391 25.76      
17 B2u 1208 1210 0.41      
18 B2u 1050 1052 8.48      
19 B3g 3057 3062 0.00      
20 B3g 1502 1504 0.00      
21 B3g 1318 1320 0.00      
22 B3g 695 696 0.00      
23 B3u 773 774 18.07      
24 B3u 410 411 16.37      

Unscaled Zero Point Vibrational Energy (zpe) 16209.6 cm-1
Scaled (by 1.0016) Zero Point Vibrational Energy (zpe) 16235.5 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 BLYP/cc-pVDZ
ABC
0.21037 0.19256 0.10054

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.430
N2 0.000 0.000 -1.430
C3 0.000 1.141 0.704
C4 0.000 -1.141 0.704
C5 0.000 -1.141 -0.704
C6 0.000 1.141 -0.704
H7 0.000 2.089 1.269
H8 0.000 -2.089 1.269
H9 0.000 -2.089 -1.269
H10 0.000 2.089 -1.269

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.85931.35241.35242.42012.42012.09502.09503.41263.4126
N22.85932.42012.42011.35241.35243.41263.41262.09502.0950
C31.35242.42012.28302.68261.40861.10293.27933.78532.1889
C41.35242.42012.28301.40862.68263.27931.10292.18893.7853
C52.42011.35242.68261.40862.28303.78532.18891.10293.2793
C62.42011.35241.40862.68262.28302.18893.78533.27931.1029
H72.09503.41261.10293.27933.78532.18894.17774.88812.5379
H82.09503.41263.27931.10292.18893.78534.17772.53794.8881
H93.41262.09503.78532.18891.10293.27934.88812.53794.1777
H103.41262.09502.18893.78533.27931.10292.53794.88814.1777

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.433 N1 C3 H7 116.771
N1 C4 C5 122.433 N1 C4 H8 116.771
N2 C5 C4 122.433 N2 C5 H9 116.771
N2 C6 C3 122.433 N2 C6 H10 116.771
C3 N1 C4 115.134 C3 C6 H10 120.796
C4 C5 H9 120.796 C5 N2 C6 115.134
C5 C4 H8 120.796 C6 C3 H7 120.796
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.112      
2 N -0.112      
3 C 0.074      
4 C 0.074      
5 C 0.074      
6 C 0.074      
7 H -0.018      
8 H -0.018      
9 H -0.018      
10 H -0.018      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.000 0.000
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -35.335 0.000 0.000
y 0.000 -27.923 0.000
z 0.000 0.000 -40.143
Traceless
 xyz
x -1.302 0.000 0.000
y 0.000 9.816 0.000
z 0.000 0.000 -8.514
Polar
3z2-r2-17.027
x2-y2-7.412
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.428 0.000 0.000
y 0.000 10.620 0.000
z 0.000 0.000 8.444


<r2> (average value of r2) Å2
<r2> 0.000
(<r2>)1/2 0.000