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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: B1B95/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-264.290660
Energy at 298.15K-264.296594
Nuclear repulsion energy210.317114
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/cc-pVTZ
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 3195 3058 0.00      
2 Ag 1649 1579 0.00      
3 Ag 1262 1208 0.00      
4 Ag 1061 1015 0.00      
5 Ag 599 574 0.00      
6 Au 1019 976 0.00      
7 Au 348 333 0.00      
8 B1g 958 917 0.00      
9 B1u 3173 3037 4.75      
10 B1u 1532 1466 0.93      
11 B1u 1178 1128 6.81      
12 B1u 1036 991 35.96      
13 B2g 1007 963 0.00      
14 B2g 788 754 0.00      
15 B2u 3188 3052 69.20      
16 B2u 1455 1393 34.50      
17 B2u 1254 1200 3.98      
18 B2u 1101 1054 11.28      
19 B3g 3172 3036 0.00      
20 B3g 1620 1551 0.00      
21 B3g 1379 1319 0.00      
22 B3g 717 686 0.00      
23 B3u 813 779 28.00      
24 B3u 431 412 22.28      

Unscaled Zero Point Vibrational Energy (zpe) 16966.5 cm-1
Scaled (by 0.9571) Zero Point Vibrational Energy (zpe) 16238.6 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/cc-pVTZ
ABC
0.21741 0.20112 0.10447

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/cc-pVTZ

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 1.123 0.693
C4 0.000 -1.123 0.693
C5 0.000 -1.123 -0.693
C6 0.000 1.123 -0.693
H7 0.000 2.053 1.247
H8 0.000 -2.053 1.247
H9 0.000 -2.053 -1.247
H10 0.000 2.053 -1.247

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.79021.32461.32462.37092.37092.05822.05823.34613.3461
N22.79022.37092.37091.32461.32463.34613.34612.05822.0582
C31.32462.37092.24632.63931.38571.08253.22403.72172.1513
C41.32462.37092.24631.38572.63933.22401.08252.15133.7217
C52.37091.32462.63931.38572.24633.72172.15131.08253.2240
C62.37091.32461.38572.63932.24632.15133.72173.22401.0825
H72.05823.34611.08253.22403.72172.15134.10584.80412.4944
H82.05823.34613.22401.08252.15133.72174.10582.49444.8041
H93.34612.05823.72172.15131.08253.22404.80412.49444.1058
H103.34612.05822.15133.72173.22401.08252.49444.80414.1058

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 122.016 N1 C3 H7 117.179
N1 C4 C5 122.016 N1 C4 H8 117.179
N2 C5 C4 122.016 N2 C5 H9 117.179
N2 C6 C3 122.016 N2 C6 H10 117.179
C3 N1 C4 115.968 C3 C6 H10 120.805
C4 C5 H9 120.805 C5 N2 C6 115.968
C5 C4 H8 120.805 C6 C3 H7 120.805
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.158      
2 N -0.158      
3 C -0.071      
4 C -0.071      
5 C -0.071      
6 C -0.071      
7 H 0.150      
8 H 0.150      
9 H 0.150      
10 H 0.150      


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 -35.514 0.000 0.000
y 0.000 -26.783 0.000
z 0.000 0.000 -40.351
Traceless
 xyz
x -1.948 0.000 0.000
y 0.000 11.149 0.000
z 0.000 0.000 -9.202
Polar
3z2-r2-18.404
x2-y2-8.731
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.468 0.000 0.000
y 0.000 10.406 0.000
z 0.000 0.000 8.690


<r2> (average value of r2) Å2
<r2> 113.494
(<r2>)1/2 10.653