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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: B97D3/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at B97D3/6-31G*
 hartrees
Energy at 0K-264.143855
Energy at 298.15K-264.149603
HF Energy-264.143855
Nuclear repulsion energy 
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 B97D3/6-31G*
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 3128 3066 0.00      
2 Ag 1584 1553 0.00      
3 Ag 1238 1214 0.00      
4 Ag 1022 1002 0.00      
5 Ag 598 586 0.00      
6 Au 953 935 0.00      
7 Au 318 312 0.00      
8 B1g 917 899 0.00      
9 B1u 3105 3044 17.78      
10 B1u 1491 1462 1.15      
11 B1u 1147 1125 3.36      
12 B1u 1009 989 34.43      
13 B2g 949 931 0.00      
14 B2g 755 740 0.00      
15 B2u 3121 3059 109.05      
16 B2u 1425 1397 27.54      
17 B2u 1241 1217 0.60      
18 B2u 1073 1052 11.05      
19 B3g 3105 3044 0.00      
20 B3g 1540 1510 0.00      
21 B3g 1357 1331 0.00      
22 B3g 707 693 0.00      
23 B3u 775 760 20.06      
24 B3u 415 407 20.09      

Unscaled Zero Point Vibrational Energy (zpe) 16485.8 cm-1
Scaled (by 0.9804) Zero Point Vibrational Energy (zpe) 16162.7 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 B97D3/6-31G*
ABC
0.21228 0.19504 0.10165

See section I.F.4 to change rotational constant units
Geometric Data calculated at B97D3/6-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.419
N2 0.000 0.000 -1.419
C3 0.000 1.137 0.701
C4 0.000 -1.137 0.701
C5 0.000 -1.137 -0.701
C6 0.000 1.137 -0.701
H7 0.000 2.075 1.263
H8 0.000 -2.075 1.263
H9 0.000 -2.075 -1.263
H10 0.000 2.075 -1.263

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.83801.34461.34462.40602.40602.08082.08083.39113.3911
N22.83802.40602.40601.34461.34463.39113.39112.08082.0808
C31.34462.40602.27412.67191.40261.09333.26083.76512.1768
C41.34462.40602.27411.40262.67193.26081.09332.17683.7651
C52.40601.34462.67191.40262.27413.76512.17681.09333.2608
C62.40601.34461.40262.67192.27412.17683.76513.26081.0933
H72.08083.39111.09333.26083.76512.17684.14994.85832.5262
H82.08083.39113.26081.09332.17683.76514.14992.52624.8583
H93.39112.08083.76512.17681.09333.26084.85832.52624.1499
H103.39112.08082.17683.76513.26081.09332.52624.85834.1499

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.798 N1 C3 H7 117.286
N1 C4 C5 121.798 N1 C4 H8 117.286
N2 C5 C4 121.798 N2 C5 H9 117.286
N2 C6 C3 121.798 N2 C6 H10 117.286
C3 N1 C4 116.404 C3 C6 H10 120.916
C4 C5 H9 120.916 C5 N2 C6 116.404
C5 C4 H8 120.916 C6 C3 H7 120.916
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B97D3/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.368      
2 N -0.368      
3 C 0.028      
4 C 0.028      
5 C 0.028      
6 C 0.028      
7 H 0.156      
8 H 0.156      
9 H 0.156      
10 H 0.156      


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 -35.084 0.000 0.000
y 0.000 -26.689 0.000
z 0.000 0.000 -40.157
Traceless
 xyz
x -1.661 0.000 0.000
y 0.000 10.932 0.000
z 0.000 0.000 -9.271
Polar
3z2-r2-18.542
x2-y2-8.396
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.082 0.000 0.000
y 0.000 10.061 0.000
z 0.000 0.000 8.218


<r2> (average value of r2) Å2
<r2> 115.848
(<r2>)1/2 10.763