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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: B3LYP/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at B3LYP/cc-pVTZ
 hartrees
Energy at 0K-264.409482
Energy at 298.15K-264.415417
Nuclear repulsion energy209.367148
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 B3LYP/cc-pVTZ
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 3169 3063 0.00      
2 Ag 1617 1563 0.00      
3 Ag 1255 1213 0.00      
4 Ag 1042 1008 0.00      
5 Ag 613 592 0.00      
6 Au 1012 978 0.00      
7 Au 352 340 0.00      
8 B1g 950 918 0.00      
9 B1u 3148 3043 5.22      
10 B1u 1519 1468 1.21      
11 B1u 1167 1128 4.72      
12 B1u 1037 1003 38.79      
13 B2g 999 966 0.00      
14 B2g 784 758 0.00      
15 B2u 3163 3057 71.70      
16 B2u 1446 1398 31.43      
17 B2u 1217 1176 3.75      
18 B2u 1092 1055 12.09      
19 B3g 3147 3042 0.00      
20 B3g 1580 1527 0.00      
21 B3g 1379 1333 0.00      
22 B3g 721 697 0.00      
23 B3u 809 782 28.20      
24 B3u 437 422 22.81      

Unscaled Zero Point Vibrational Energy (zpe) 16826.6 cm-1
Scaled (by 0.9666) Zero Point Vibrational Energy (zpe) 16264.6 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 B3LYP/cc-pVTZ
ABC
0.21500 0.19964 0.10352

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/cc-pVTZ

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.400
N2 0.000 0.000 -1.400
C3 0.000 1.130 0.695
C4 0.000 -1.130 0.695
C5 0.000 -1.130 -0.695
C6 0.000 1.130 -0.695
H7 0.000 2.060 1.251
H8 0.000 -2.060 1.251
H9 0.000 -2.060 -1.251
H10 0.000 2.060 -1.251

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.80051.33181.33182.38092.38092.06592.06593.35813.3581
N22.80052.38092.38091.33181.33183.35813.35812.06592.0659
C31.33182.38092.26002.65371.39091.08393.23863.73762.1578
C41.33182.38092.26001.39092.65373.23861.08392.15783.7376
C52.38091.33182.65371.39092.26003.73762.15781.08393.2386
C62.38091.33181.39092.65372.26002.15783.73763.23861.0839
H72.06593.35811.08393.23863.73762.15784.12104.82142.5028
H82.06593.35813.23861.08392.15783.73764.12102.50284.8214
H93.35812.06593.73762.15781.08393.23864.82142.50284.1210
H103.35812.06592.15783.73763.23861.08392.50284.82144.1210

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.953 N1 C3 H7 117.191
N1 C4 C5 121.953 N1 C4 H8 117.191
N2 C5 C4 121.953 N2 C5 H9 117.191
N2 C6 C3 121.953 N2 C6 H10 117.191
C3 N1 C4 116.094 C3 C6 H10 120.856
C4 C5 H9 120.856 C5 N2 C6 116.094
C5 C4 H8 120.856 C6 C3 H7 120.856
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.153 0.000   -0.433
2 N -0.153 0.000   -0.433
3 C -0.053 0.000   0.174
4 C -0.053 0.000   0.174
5 C -0.053 0.000   0.174
6 C -0.053 0.000   0.174
7 H 0.130 0.000   0.043
8 H 0.130 0.000   0.043
9 H 0.130 0.000   0.043
10 H 0.130 0.000   0.043


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 0.000 0.000 0.000 0.000
AIM        
ESP 0.000 0.000 0.000 0.000


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -35.798 0.000 0.000
y 0.000 -27.169 0.000
z 0.000 0.000 -40.942
Traceless
 xyz
x -1.742 0.000 0.000
y 0.000 11.201 0.000
z 0.000 0.000 -9.459
Polar
3z2-r2-18.918
x2-y2-8.629
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.499 0.000 0.000
y 0.000 10.564 0.000
z 0.000 0.000 8.803


<r2> (average value of r2) Å2
<r2> 114.583
(<r2>)1/2 10.704