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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: B3LYP/Def2TZVPP

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/Def2TZVPP
 hartrees
Energy at 0K-264.418740
Energy at 298.15K-264.424662
HF Energy-264.418740
Nuclear repulsion energy209.381606
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/Def2TZVPP
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 3174 3055 0.00      
2 Ag 1616 1555 0.00      
3 Ag 1255 1208 0.00      
4 Ag 1043 1004 0.00      
5 Ag 613 590 0.00      
6 Au 1012 975 0.00      
7 Au 352 339 0.00      
8 B1g 950 914 0.00      
9 B1u 3154 3036 4.03      
10 B1u 1520 1463 0.81      
11 B1u 1168 1124 5.12      
12 B1u 1038 999 37.63      
13 B2g 1000 963 0.00      
14 B2g 783 754 0.00      
15 B2u 3168 3049 66.98      
16 B2u 1447 1393 31.46      
17 B2u 1219 1174 4.05      
18 B2u 1092 1051 12.20      
19 B3g 3152 3034 0.00      
20 B3g 1582 1523 0.00      
21 B3g 1379 1328 0.00      
22 B3g 722 695 0.00      
23 B3u 808 777 29.41      
24 B3u 436 420 23.44      

Unscaled Zero Point Vibrational Energy (zpe) 16840.2 cm-1
Scaled (by 0.9626) Zero Point Vibrational Energy (zpe) 16210.4 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/Def2TZVPP
ABC
0.21492 0.19977 0.10353

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/Def2TZVPP

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.395
N2 0.000 0.000 -1.395
C3 0.000 1.132 0.697
C4 0.000 -1.132 0.697
C5 0.000 -1.132 -0.697
C6 0.000 1.132 -0.697
H7 0.000 2.064 1.252
H8 0.000 -2.064 1.252
H9 0.000 -2.064 -1.252
H10 0.000 2.064 -1.252

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.78991.33041.33042.37842.37842.06852.06853.35663.3566
N22.78992.37842.37841.33041.33043.35663.35662.06852.0685
C31.33042.37842.26472.65891.39311.08453.24393.74332.1600
C41.33042.37842.26471.39312.65893.24391.08452.16003.7433
C52.37841.33042.65891.39312.26473.74332.16001.08453.2439
C62.37841.33041.39312.65892.26472.16003.74333.24391.0845
H72.06853.35661.08453.24393.74332.16004.12714.82782.5048
H82.06853.35663.24391.08452.16003.74334.12712.50484.8278
H93.35662.06853.74332.16001.08453.24394.82782.50484.1271
H103.35662.06852.16003.74333.24391.08452.50484.82784.1271

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.664 N1 C3 H7 117.502
N1 C4 C5 121.664 N1 C4 H8 117.502
N2 C5 C4 121.664 N2 C5 H9 117.502
N2 C6 C3 121.664 N2 C6 H10 117.502
C3 N1 C4 116.671 C3 C6 H10 120.834
C4 C5 H9 120.834 C5 N2 C6 116.671
C5 C4 H8 120.834 C6 C3 H7 120.834
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/Def2TZVPP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.218      
2 N -0.218      
3 C -0.019      
4 C -0.019      
5 C -0.019      
6 C -0.019      
7 H 0.128      
8 H 0.128      
9 H 0.128      
10 H 0.128      


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 -35.960 0.000 0.000
y 0.000 -27.237 0.000
z 0.000 0.000 -41.287
Traceless
 xyz
x -1.698 0.000 0.000
y 0.000 11.386 0.000
z 0.000 0.000 -9.688
Polar
3z2-r2-19.376
x2-y2-8.723
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.933 0.000 0.000
y 0.000 10.721 0.000
z 0.000 0.000 9.095


<r2> (average value of r2) Å2
<r2> 114.696
(<r2>)1/2 10.710