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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: B2PLYP/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 B2PLYP/6-31G*
 hartrees
Energy at 0K-264.040388
Energy at 298.15K-264.046266
HF Energy-263.765617
Nuclear repulsion energy208.342835
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 B2PLYP/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 3230 3066 0.00      
2 Ag 1640 1556 0.00      
3 Ag 1273 1208 0.00      
4 Ag 1045 992 0.00      
5 Ag 609 578 0.00      
6 Au 987 937 0.00      
7 Au 350 333 0.00      
8 B1g 949 901 0.00      
9 B1u 3210 3047 8.68      
10 B1u 1535 1457 2.20      
11 B1u 1175 1115 4.01      
12 B1u 1038 985 36.47      
13 B2g 977 927 0.00      
14 B2g 768 729 0.00      
15 B2u 3225 3061 66.86      
16 B2u 1464 1390 32.01      
17 B2u 1266 1202 3.01      
18 B2u 1106 1050 12.05      
19 B3g 3210 3046 0.00      
20 B3g 1594 1513 0.00      
21 B3g 1396 1325 0.00      
22 B3g 722 685 0.00      
23 B3u 807 766 21.65      
24 B3u 432 410 22.57      

Unscaled Zero Point Vibrational Energy (zpe) 17003.5 cm-1
Scaled (by 0.9492) Zero Point Vibrational Energy (zpe) 16139.7 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 B2PLYP/6-31G*
ABC
0.21364 0.19697 0.10248

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP/6-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.412
N2 0.000 0.000 -1.412
C3 0.000 1.134 0.698
C4 0.000 -1.134 0.698
C5 0.000 -1.134 -0.698
C6 0.000 1.134 -0.698
H7 0.000 2.066 1.256
H8 0.000 -2.066 1.256
H9 0.000 -2.066 -1.256
H10 0.000 2.066 -1.256

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.82411.33991.33992.39532.39532.07182.07183.37453.3745
N22.82412.39532.39531.33991.33993.37453.37452.07182.0718
C31.33992.39532.26762.66281.39591.08653.24803.74922.1651
C41.33992.39532.26761.39592.66283.24801.08652.16513.7492
C52.39531.33992.66281.39592.26763.74922.16511.08653.2480
C62.39531.33991.39592.66282.26762.16513.74923.24801.0865
H72.07183.37451.08653.24803.74922.16514.13184.83572.5123
H82.07183.37453.24801.08652.16513.74924.13182.51234.8357
H93.37452.07183.74922.16511.08653.24804.83572.51234.1318
H103.37452.07182.16513.74923.24801.08652.51234.83574.1318

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.203 N1 C3 H7 116.882
N1 C4 C5 122.203 N1 C4 H8 116.882
N2 C5 C4 122.203 N2 C5 H9 116.882
N2 C6 C3 122.203 N2 C6 H10 116.882
C3 N1 C4 115.594 C3 C6 H10 120.915
C4 C5 H9 120.915 C5 N2 C6 115.594
C5 C4 H8 120.915 C6 C3 H7 120.915
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.416      
2 N -0.416      
3 C 0.027      
4 C 0.027      
5 C 0.027      
6 C 0.027      
7 H 0.181      
8 H 0.181      
9 H 0.181      
10 H 0.181      


Electric dipole moments


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.014 0.000 0.000
y 0.000 9.716 0.000
z 0.000 0.000 7.941


<r2> (average value of r2) Å2
<r2> 115.244
(<r2>)1/2 10.735