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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: HF/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at HF/6-311G**
 hartrees
Energy at 0K-262.739968
Energy at 298.15K-262.746193
Nuclear repulsion energy211.149988
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 HF/6-311G**
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 3354 3047 0.00      
2 Ag 1794 1630 0.00      
3 Ag 1347 1224 0.00      
4 Ag 1121 1018 0.00      
5 Ag 654 595 0.00      
6 Au 1120 1017 0.00      
7 Au 425 386 0.00      
8 B1g 1042 946 0.00      
9 B1u 3330 3025 5.77      
10 B1u 1654 1503 1.09      
11 B1u 1252 1138 10.64      
12 B1u 1120 1018 40.43      
13 B2g 1096 996 0.00      
14 B2g 838 761 0.00      
15 B2u 3348 3041 67.26      
16 B2u 1557 1414 48.02      
17 B2u 1186 1078 0.79      
18 B2u 1087 987 61.82      
19 B3g 3329 3024 0.00      
20 B3g 1749 1589 0.00      
21 B3g 1482 1346 0.00      
22 B3g 776 705 0.00      
23 B3u 892 810 34.93      
24 B3u 485 441 27.41      

Unscaled Zero Point Vibrational Energy (zpe) 18017.9 cm-1
Scaled (by 0.9085) Zero Point Vibrational Energy (zpe) 16369.3 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 HF/6-311G**
ABC
0.21860 0.20305 0.10527

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-311G**

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.385
N2 0.000 0.000 -1.385
C3 0.000 1.121 0.693
C4 0.000 -1.121 0.693
C5 0.000 -1.121 -0.693
C6 0.000 1.121 -0.693
H7 0.000 2.044 1.245
H8 0.000 -2.044 1.245
H9 0.000 -2.044 -1.245
H10 0.000 2.044 -1.245

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.77061.31741.31742.36092.36092.04852.04853.33063.3306
N22.77062.36092.36091.31741.31743.33063.33062.04852.0485
C31.31742.36092.24132.63491.38541.07543.21203.71022.1459
C41.31742.36092.24131.38542.63493.21201.07542.14593.7102
C52.36091.31742.63491.38542.24133.71022.14591.07543.2120
C62.36091.31741.38542.63492.24132.14593.71023.21201.0754
H72.04853.33061.07543.21203.71022.14594.08724.78562.4892
H82.04853.33063.21201.07542.14593.71024.08722.48924.7856
H93.33062.04853.71022.14591.07543.21204.78562.48924.0872
H103.33062.04852.14593.71023.21201.07542.48924.78564.0872

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.717 N1 C3 H7 117.404
N1 C4 C5 121.717 N1 C4 H8 117.404
N2 C5 C4 121.717 N2 C5 H9 117.404
N2 C6 C3 121.717 N2 C6 H10 117.404
C3 N1 C4 116.565 C3 C6 H10 120.878
C4 C5 H9 120.878 C5 N2 C6 116.565
C5 C4 H8 120.878 C6 C3 H7 120.878
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.320      
2 N -0.320      
3 C 0.043      
4 C 0.043      
5 C 0.043      
6 C 0.043      
7 H 0.117      
8 H 0.117      
9 H 0.117      
10 H 0.117      


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 -36.311 0.000 0.000
y 0.000 -26.524 0.000
z 0.000 0.000 -41.229
Traceless
 xyz
x -2.434 0.000 0.000
y 0.000 12.245 0.000
z 0.000 0.000 -9.811
Polar
3z2-r2-19.623
x2-y2-9.786
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.781 0.000 0.000
y 0.000 9.602 0.000
z 0.000 0.000 7.894


<r2> (average value of r2) Å2
<r2> 113.091
(<r2>)1/2 10.634