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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: wB97X-D/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 wB97X-D/cc-pVDZ
 hartrees
Energy at 0K-264.236444
Energy at 298.15K-264.242397
HF Energy-264.236444
Nuclear repulsion energy208.977322
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 wB97X-D/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 3232 3078 0.00      
2 Ag 1664 1585 0.00      
3 Ag 1271 1211 0.00      
4 Ag 1060 1010 0.00      
5 Ag 614 585 0.00      
6 Au 1015 967 0.00      
7 Au 360 343 0.00      
8 B1g 954 909 0.00      
9 B1u 3212 3060 2.34      
10 B1u 1539 1466 0.25      
11 B1u 1181 1125 11.26      
12 B1u 1043 994 28.35      
13 B2g 999 952 0.00      
14 B2g 778 741 0.00      
15 B2u 3226 3073 56.77      
16 B2u 1462 1393 35.68      
17 B2u 1246 1187 7.76      
18 B2u 1108 1056 11.81      
19 B3g 3211 3059 0.00      
20 B3g 1635 1558 0.00      
21 B3g 1385 1319 0.00      
22 B3g 725 691 0.00      
23 B3u 814 775 34.93      
24 B3u 437 416 26.43      

Unscaled Zero Point Vibrational Energy (zpe) 17085.4 cm-1
Scaled (by 0.9526) Zero Point Vibrational Energy (zpe) 16275.5 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 wB97X-D/cc-pVDZ
ABC
0.21480 0.19836 0.10313

See section I.F.4 to change rotational constant units
Geometric Data calculated at wB97X-D/cc-pVDZ

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 1.133 0.698
C4 0.000 -1.133 0.698
C5 0.000 -1.133 -0.698
C6 0.000 1.133 -0.698
H7 0.000 2.067 1.255
H8 0.000 -2.067 1.255
H9 0.000 -2.067 -1.255
H10 0.000 2.067 -1.255

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.80271.33321.33322.38582.38582.07182.07183.36573.3657
N22.80272.38582.38581.33321.33323.36573.36572.07182.0718
C31.33322.38582.26562.66151.39671.08733.24753.74872.1652
C41.33322.38582.26561.39672.66153.24751.08732.16523.7487
C52.38581.33322.66151.39672.26563.74872.16521.08733.2475
C62.38581.33321.39672.66152.26562.16523.74873.24751.0873
H72.07183.36571.08733.24753.74872.16524.13334.83592.5103
H82.07183.36573.24751.08732.16523.74874.13332.51034.8359
H93.36572.07183.74872.16521.08733.24754.83592.51034.1333
H103.36572.07182.16523.74873.24751.08732.51034.83594.1333

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.824 N1 C3 H7 117.370
N1 C4 C5 121.824 N1 C4 H8 117.370
N2 C5 C4 121.824 N2 C5 H9 117.370
N2 C6 C3 121.824 N2 C6 H10 117.370
C3 N1 C4 116.352 C3 C6 H10 120.806
C4 C5 H9 120.806 C5 N2 C6 116.352
C5 C4 H8 120.806 C6 C3 H7 120.806
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at wB97X-D/cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.191      
2 N -0.191      
3 C -0.070      
4 C -0.070      
5 C -0.070      
6 C -0.070      
7 H 0.165      
8 H 0.165      
9 H 0.165      
10 H 0.165      


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 -36.157 0.000 0.000
y 0.000 -26.395 0.000
z 0.000 0.000 -41.790
Traceless
 xyz
x -2.065 0.000 0.000
y 0.000 12.578 0.000
z 0.000 0.000 -10.514
Polar
3z2-r2-21.027
x2-y2-9.762
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.887 0.000 0.000
y 0.000 10.416 0.000
z 0.000 0.000 9.213


<r2> (average value of r2) Å2
<r2> 115.017
(<r2>)1/2 10.725