return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: BLYP/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 BLYP/6-31G**
 hartrees
Energy at 0K-264.231329
Energy at 298.15K-264.237067
Nuclear repulsion energy206.642976
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 BLYP/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 3098 3074 0.00      
2 Ag 1555 1543 0.00      
3 Ag 1222 1212 0.00      
4 Ag 1002 995 0.00      
5 Ag 592 587 0.00      
6 Au 951 944 0.00      
7 Au 320 318 0.00      
8 B1g 914 907 0.00      
9 B1u 3076 3052 14.20      
10 B1u 1471 1459 1.30      
11 B1u 1130 1121 2.44      
12 B1u 997 989 34.64      
13 B2g 947 940 0.00      
14 B2g 749 743 0.00      
15 B2u 3091 3067 91.17      
16 B2u 1407 1396 24.36      
17 B2u 1209 1199 0.46      
18 B2u 1058 1050 10.97      
19 B3g 3076 3053 0.00      
20 B3g 1510 1499 0.00      
21 B3g 1342 1332 0.00      
22 B3g 699 694 0.00      
23 B3u 777 771 15.33      
24 B3u 414 411 19.21      

Unscaled Zero Point Vibrational Energy (zpe) 16303.1 cm-1
Scaled (by 0.9923) Zero Point Vibrational Energy (zpe) 16177.5 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 BLYP/6-31G**
ABC
0.21042 0.19356 0.10082

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.425
N2 0.000 0.000 -1.425
C3 0.000 1.142 0.703
C4 0.000 -1.142 0.703
C5 0.000 -1.142 -0.703
C6 0.000 1.142 -0.703
H7 0.000 2.083 1.265
H8 0.000 -2.083 1.265
H9 0.000 -2.083 -1.265
H10 0.000 2.083 -1.265

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.85081.35131.35132.41582.41582.08922.08923.40243.4024
N22.85082.41582.41581.35131.35133.40243.40242.08922.0892
C31.35132.41582.28442.68271.40661.09563.27373.77832.1815
C41.35132.41582.28441.40662.68273.27371.09562.18153.7783
C52.41581.35132.68271.40662.28443.77832.18151.09563.2737
C62.41581.35131.40662.68272.28442.18153.77833.27371.0956
H72.08923.40241.09563.27373.77832.18154.16604.87392.5297
H82.08923.40243.27371.09562.18153.77834.16602.52974.8739
H93.40242.08923.77832.18151.09563.27374.87392.52974.1660
H103.40242.08922.18153.77833.27371.09562.52974.87394.1660

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.301 N1 C3 H7 116.865
N1 C4 C5 122.301 N1 C4 H8 116.865
N2 C5 C4 122.301 N2 C5 H9 116.865
N2 C6 C3 122.301 N2 C6 H10 116.865
C3 N1 C4 115.397 C3 C6 H10 120.834
C4 C5 H9 120.834 C5 N2 C6 115.397
C5 C4 H8 120.834 C6 C3 H7 120.834
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.371      
2 N -0.371      
3 C 0.100      
4 C 0.100      
5 C 0.100      
6 C 0.100      
7 H 0.085      
8 H 0.085      
9 H 0.085      
10 H 0.085      


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 -35.084 0.000 0.000
y 0.000 -27.226 0.000
z 0.000 0.000 -40.389
Traceless
 xyz
x -1.276 0.000 0.000
y 0.000 10.510 0.000
z 0.000 0.000 -9.234
Polar
3z2-r2-18.468
x2-y2-7.858
xy0.000
xz0.000
yz0.000


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


<r2> (average value of r2) Å2
<r2> 116.764
(<r2>)1/2 10.806