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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: PBEPBE/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 PBEPBE/Def2TZVPP
 hartrees
Energy at 0K-264.094174
Energy at 298.15K-264.099925
HF Energy-264.094174
Nuclear repulsion energy208.118578
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 PBEPBE/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 3093 3055 0.00      
2 Ag 1563 1544 0.00      
3 Ag 1217 1202 0.00      
4 Ag 1016 1004 0.00      
5 Ag 589 582 0.00      
6 Au 968 956 0.00      
7 Au 311 307 0.00      
8 B1g 916 904 0.00      
9 B1u 3072 3035 5.54      
10 B1u 1466 1448 0.97      
11 B1u 1136 1122 5.01      
12 B1u 1001 989 33.59      
13 B2g 959 948 0.00      
14 B2g 760 751 0.00      
15 B2u 3087 3049 76.80      
16 B2u 1400 1383 28.81      
17 B2u 1236 1221 1.02      
18 B2u 1060 1047 9.44      
19 B3g 3072 3034 0.00      
20 B3g 1533 1515 0.00      
21 B3g 1329 1313 0.00      
22 B3g 697 689 0.00      
23 B3u 773 764 28.34      
24 B3u 409 404 20.87      

Unscaled Zero Point Vibrational Energy (zpe) 16330.3 cm-1
Scaled (by 0.9879) Zero Point Vibrational Energy (zpe) 16132.7 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 PBEPBE/Def2TZVPP
ABC
0.21312 0.19675 0.10230

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

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.404
N2 0.000 0.000 -1.404
C3 0.000 1.137 0.700
C4 0.000 -1.137 0.700
C5 0.000 -1.137 -0.700
C6 0.000 1.137 -0.700
H7 0.000 2.076 1.261
H8 0.000 -2.076 1.261
H9 0.000 -2.076 -1.261
H10 0.000 2.076 -1.261

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.80811.33741.33742.39192.39192.08122.08123.37853.3785
N22.80812.39192.39191.33741.33743.37853.37852.08122.0812
C31.33742.39192.27452.67111.40051.09383.26213.76482.1747
C41.33742.39192.27451.40052.67113.26211.09382.17473.7648
C52.39191.33742.67111.40052.27453.76482.17471.09383.2621
C62.39191.33741.40052.67112.27452.17473.76483.26211.0938
H72.08123.37851.09383.26213.76482.17474.15254.85862.5225
H82.08123.37853.26211.09382.17473.76484.15252.52254.8586
H93.37852.08123.76482.17471.09383.26214.85862.52254.1525
H103.37852.08122.17473.76483.26211.09382.52254.85864.1525

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.751 N1 C3 H7 117.394
N1 C4 C5 121.751 N1 C4 H8 117.394
N2 C5 C4 121.751 N2 C5 H9 117.394
N2 C6 C3 121.751 N2 C6 H10 117.394
C3 N1 C4 116.497 C3 C6 H10 120.854
C4 C5 H9 120.854 C5 N2 C6 116.497
C5 C4 H8 120.854 C6 C3 H7 120.854
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/Def2TZVPP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.171      
2 N -0.171      
3 C -0.022      
4 C -0.022      
5 C -0.022      
6 C -0.022      
7 H 0.108      
8 H 0.108      
9 H 0.108      
10 H 0.108      


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 -35.905 0.000 0.000
y 0.000 -27.352 0.000
z 0.000 0.000 -41.035
Traceless
 xyz
x -1.712 0.000 0.000
y 0.000 11.118 0.000
z 0.000 0.000 -9.406
Polar
3z2-r2-18.812
x2-y2-8.554
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.975 0.000 0.000
y 0.000 11.054 0.000
z 0.000 0.000 9.384


<r2> (average value of r2) Å2
<r2> 115.778
(<r2>)1/2 10.760