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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: B1B95/CEP-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 B1B95/CEP-31G*
 hartrees
Energy at 0K-44.735973
Energy at 298.15K-44.741784
Nuclear repulsion energy104.803616
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 B1B95/CEP-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 3204 3067 0.00      
2 Ag 1650 1580 0.00      
3 Ag 1248 1195 0.00      
4 Ag 1045 1000 0.00      
5 Ag 586 561 0.00      
6 Au 997 954 0.00      
7 Au 339 325 0.00      
8 B1g 953 913 0.00      
9 B1u 3177 3041 4.48      
10 B1u 1502 1438 0.06      
11 B1u 1165 1115 14.76      
12 B1u 1010 967 23.12      
13 B2g 981 939 0.00      
14 B2g 763 730 0.00      
15 B2u 3195 3058 85.18      
16 B2u 1439 1377 43.20      
17 B2u 1289 1234 4.03      
18 B2u 1088 1041 4.67      
19 B3g 3170 3034 0.00      
20 B3g 1601 1532 0.00      
21 B3g 1346 1288 0.00      
22 B3g 689 659 0.00      
23 B3u 808 774 47.30      
24 B3u 417 399 19.50      

Unscaled Zero Point Vibrational Energy (zpe) 16830.8 cm-1
Scaled (by 0.9572) Zero Point Vibrational Energy (zpe) 16110.4 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 B1B95/CEP-31G*
ABC
0.21298 0.19137 0.10080

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/CEP-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.431
N2 0.000 0.000 -1.431
C3 0.000 1.134 0.711
C4 0.000 -1.134 0.711
C5 0.000 -1.134 -0.711
C6 0.000 1.134 -0.711
H7 0.000 2.080 1.265
H8 0.000 -2.080 1.265
H9 0.000 -2.080 -1.265
H10 0.000 2.080 -1.265

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.86251.34331.34332.42392.42392.08632.08633.40523.4052
N22.86252.42392.42391.34331.34333.40523.40522.08632.0863
C31.34332.42392.26782.67681.42211.09623.26103.77262.1908
C41.34332.42392.26781.42212.67683.26101.09622.19083.7726
C52.42391.34332.67681.42212.26783.77262.19081.09623.2610
C62.42391.34331.42212.67682.26782.19083.77263.26101.0962
H72.08633.40521.09623.26103.77262.19084.15944.86852.5302
H82.08633.40523.26101.09622.19083.77264.15942.53024.8685
H93.40522.08633.77262.19081.09623.26104.86852.53024.1594
H103.40522.08632.19083.77263.26101.09622.53024.86854.1594

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.423 N1 C3 H7 117.216
N1 C4 C5 122.423 N1 C4 H8 117.216
N2 C5 C4 122.423 N2 C5 H9 117.216
N2 C6 C3 122.423 N2 C6 H10 117.216
C3 N1 C4 115.154 C3 C6 H10 120.362
C4 C5 H9 120.362 C5 N2 C6 115.154
C5 C4 H8 120.362 C6 C3 H7 120.362
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/CEP-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N 0.319      
2 N 0.319      
3 C -0.419      
4 C -0.419      
5 C -0.419      
6 C -0.419      
7 H 0.260      
8 H 0.260      
9 H 0.260      
10 H 0.260      


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 -35.418 0.000 0.000
y 0.000 -25.572 0.000
z 0.000 0.000 -40.828
Traceless
 xyz
x -2.218 0.000 0.000
y 0.000 12.552 0.000
z 0.000 0.000 -10.333
Polar
3z2-r2-20.667
x2-y2-9.847
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.796 0.000 0.000
y 0.000 9.481 0.000
z 0.000 0.000 8.372


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