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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: B1B95/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 B1B95/cc-pVDZ
 hartrees
Energy at 0K-264.229168
Energy at 298.15K-264.235058
Nuclear repulsion energy209.001631
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/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 3196 3072 0.00      
2 Ag 1654 1590 0.00      
3 Ag 1250 1201 0.00      
4 Ag 1057 1016 0.00      
5 Ag 596 572 0.00      
6 Au 1002 963 0.00      
7 Au 343 330 0.00      
8 B1g 944 907 0.00      
9 B1u 3173 3050 6.40      
10 B1u 1516 1457 0.77      
11 B1u 1169 1124 7.39      
12 B1u 1029 989 35.90      
13 B2g 989 950 0.00      
14 B2g 778 748 0.00      
15 B2u 3190 3066 64.65      
16 B2u 1443 1387 34.49      
17 B2u 1277 1227 2.06      
18 B2u 1096 1054 7.72      
19 B3g 3173 3050 0.00      
20 B3g 1616 1554 0.00      
21 B3g 1354 1301 0.00      
22 B3g 713 686 0.00      
23 B3u 801 770 23.17      
24 B3u 424 408 18.82      

Unscaled Zero Point Vibrational Energy (zpe) 16891.0 cm-1
Scaled (by 0.9612) Zero Point Vibrational Energy (zpe) 16235.6 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/cc-pVDZ
ABC
0.21577 0.19775 0.10318

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/cc-pVDZ

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.409
N2 0.000 0.000 -1.409
C3 0.000 1.127 0.697
C4 0.000 -1.127 0.697
C5 0.000 -1.127 -0.697
C6 0.000 1.127 -0.697
H7 0.000 2.066 1.255
H8 0.000 -2.066 1.255
H9 0.000 -2.066 -1.255
H10 0.000 2.066 -1.255

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.81811.33291.33292.38812.38812.07202.07203.37153.3715
N22.81812.38812.38811.33291.33293.37153.37152.07202.0720
C31.33292.38812.25312.64911.39331.09323.24133.74212.1662
C41.33292.38812.25311.39332.64913.24131.09322.16623.7421
C52.38811.33292.64911.39332.25313.74212.16621.09323.2413
C62.38811.33291.39332.64912.25312.16623.74213.24131.0932
H72.07203.37151.09323.24133.74212.16624.13264.83522.5101
H82.07203.37153.24131.09322.16623.74214.13262.51014.8352
H93.37152.07203.74212.16621.09323.24134.83522.51014.1326
H103.37152.07202.16623.74213.24131.09322.51014.83524.1326

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.309 N1 C3 H7 116.971
N1 C4 C5 122.309 N1 C4 H8 116.971
N2 C5 C4 122.309 N2 C5 H9 116.971
N2 C6 C3 122.309 N2 C6 H10 116.971
C3 N1 C4 115.382 C3 C6 H10 120.720
C4 C5 H9 120.720 C5 N2 C6 115.382
C5 C4 H8 120.720 C6 C3 H7 120.720
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.175      
2 N -0.175      
3 C 0.070      
4 C 0.070      
5 C 0.070      
6 C 0.070      
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 -35.287 0.000 0.000
y 0.000 -27.026 0.000
z 0.000 0.000 -39.798
Traceless
 xyz
x -1.875 0.000 0.000
y 0.000 10.517 0.000
z 0.000 0.000 -8.641
Polar
3z2-r2-17.283
x2-y2-8.261
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.412 0.000 0.000
y 0.000 10.098 0.000
z 0.000 0.000 8.096


<r2> (average value of r2) Å2
<r2> 114.539
(<r2>)1/2 10.702