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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: B1B95/CEP-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 B1B95/CEP-31G
 hartrees
Energy at 0K-44.646834
Energy at 298.15K-44.652670
Nuclear repulsion energy103.960302
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 B1B95/CEP-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 3246 3108 0.00      
2 Ag 1592 1524 0.00      
3 Ag 1249 1196 0.00      
4 Ag 1017 973 0.00      
5 Ag 591 566 0.00      
6 Au 1001 959 0.00      
7 Au 336 322 0.00      
8 B1g 962 921 0.00      
9 B1u 3216 3079 3.32      
10 B1u 1467 1404 8.32      
11 B1u 1136 1088 7.82      
12 B1u 999 957 19.10      
13 B2g 991 949 0.00      
14 B2g 773 740 0.00      
15 B2u 3236 3098 84.33      
16 B2u 1429 1368 48.03      
17 B2u 1263 1209 4.63      
18 B2u 1088 1042 3.36      
19 B3g 3207 3071 0.00      
20 B3g 1567 1500 0.00      
21 B3g 1358 1300 0.00      
22 B3g 692 663 0.00      
23 B3u 820 785 55.47      
24 B3u 432 413 26.37      

Unscaled Zero Point Vibrational Energy (zpe) 16833.1 cm-1
Scaled (by 0.9575) Zero Point Vibrational Energy (zpe) 16117.7 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 B1B95/CEP-31G
ABC
0.20678 0.19022 0.09908

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/CEP-31G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.435
N2 0.000 0.000 -1.435
C3 0.000 1.154 0.713
C4 0.000 -1.154 0.713
C5 0.000 -1.154 -0.713
C6 0.000 1.154 -0.713
H7 0.000 2.091 1.274
H8 0.000 -2.091 1.274
H9 0.000 -2.091 -1.274
H10 0.000 2.091 -1.274

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.86971.36081.36082.43842.43842.09702.09703.42163.4216
N22.86972.43842.43841.36081.36083.42163.42162.09702.0970
C31.36082.43842.30762.71301.42661.09183.29273.80472.1968
C41.36082.43842.30761.42662.71303.29271.09182.19683.8047
C52.43841.36082.71301.42662.30763.80472.19681.09183.2927
C62.43841.36081.42662.71302.30762.19683.80473.29271.0918
H72.09703.42161.09183.29273.80472.19684.18164.89642.5473
H82.09703.42163.29271.09182.19683.80474.18162.54734.8964
H93.42162.09703.80472.19681.09183.29274.89642.54734.1816
H103.42162.09702.19683.80473.29271.09182.54734.89644.1816

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.020 N1 C3 H7 117.100
N1 C4 C5 122.020 N1 C4 H8 117.100
N2 C5 C4 122.020 N2 C5 H9 117.100
N2 C6 C3 122.020 N2 C6 H10 117.100
C3 N1 C4 115.961 C3 C6 H10 120.880
C4 C5 H9 120.880 C5 N2 C6 115.961
C5 C4 H8 120.880 C6 C3 H7 120.880
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/CEP-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N 0.273      
2 N 0.273      
3 C -0.393      
4 C -0.393      
5 C -0.393      
6 C -0.393      
7 H 0.257      
8 H 0.257      
9 H 0.257      
10 H 0.257      


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 -35.858 0.000 0.000
y 0.000 -25.389 0.000
z 0.000 0.000 -43.456
Traceless
 xyz
x -1.435 0.000 0.000
y 0.000 14.268 0.000
z 0.000 0.000 -12.832
Polar
3z2-r2-25.664
x2-y2-10.469
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.550 0.000 0.000
y 0.000 9.349 0.000
z 0.000 0.000 8.180


<r2> (average value of r2) Å2
<r2> 0.000
(<r2>)1/2 0.000