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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: HF/aug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at HF/aug-cc-pVDZ
 hartrees
Energy at 0K-262.716519
Energy at 298.15K-262.722730
Nuclear repulsion energy210.554597
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 HF/aug-cc-pVDZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Ag 3365 3064 0.00      
2 Ag 1791 1631 0.00      
3 Ag 1340 1220 0.00      
4 Ag 1120 1020 0.00      
5 Ag 653 595 0.00      
6 Au 1103 1005 0.00      
7 Au 421 383 0.00      
8 B1g 1031 939 0.00      
9 B1u 3341 3043 3.14      
10 B1u 1645 1498 0.80      
11 B1u 1247 1135 8.81      
12 B1u 1113 1014 37.05      
13 B2g 1068 972 0.00      
14 B2g 826 752 0.00      
15 B2u 3359 3059 57.46      
16 B2u 1549 1410 46.84      
17 B2u 1187 1081 0.16      
18 B2u 1103 1005 84.93      
19 B3g 3340 3042 0.00      
20 B3g 1749 1593 0.00      
21 B3g 1472 1341 0.00      
22 B3g 770 701 0.00      
23 B3u 884 805 39.93      
24 B3u 484 440 27.69      

Unscaled Zero Point Vibrational Energy (zpe) 17980.9 cm-1
Scaled (by 0.9106) Zero Point Vibrational Energy (zpe) 16373.4 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 HF/aug-cc-pVDZ
ABC
0.21743 0.20190 0.10469

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/aug-cc-pVDZ

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.389
N2 0.000 0.000 -1.389
C3 0.000 1.123 0.695
C4 0.000 -1.123 0.695
C5 0.000 -1.123 -0.695
C6 0.000 1.123 -0.695
H7 0.000 2.052 1.247
H8 0.000 -2.052 1.247
H9 0.000 -2.052 -1.247
H10 0.000 2.052 -1.247

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N12.77861.32061.32062.36752.36752.05702.05703.34073.3407
N22.77862.36752.36751.32061.32063.34073.34072.05702.0570
C31.32062.36752.24642.64151.38961.08053.22293.72192.1524
C41.32062.36752.24641.38962.64153.22291.08052.15243.7219
C52.36751.32062.64151.38962.24643.72192.15241.08053.2229
C62.36751.32061.38962.64152.24642.15243.72193.22291.0805
H72.05703.34071.08053.22293.72192.15244.10414.80232.4938
H82.05703.34073.22291.08052.15243.72194.10412.49384.8023
H93.34072.05703.72192.15241.08053.22294.80232.49384.1041
H103.34072.05702.15243.72193.22291.08052.49384.80234.1041

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 121.730 N1 C3 H7 117.544
N1 C4 C5 121.730 N1 C4 H8 117.544
N2 C5 C4 121.730 N2 C5 H9 117.544
N2 C6 C3 121.730 N2 C6 H10 117.544
C3 N1 C4 116.540 C3 C6 H10 120.726
C4 C5 H9 120.726 C5 N2 C6 116.540
C5 C4 H8 120.726 C6 C3 H7 120.726
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/aug-cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.700      
2 N -0.700      
3 C 0.605      
4 C 0.605      
5 C 0.605      
6 C 0.605      
7 H -0.255      
8 H -0.255      
9 H -0.255      
10 H -0.255      


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 -36.875 0.000 0.000
y 0.000 -26.682 0.000
z 0.000 0.000 -41.525
Traceless
 xyz
x -2.772 0.000 0.000
y 0.000 12.518 0.000
z 0.000 0.000 -9.746
Polar
3z2-r2-19.492
x2-y2-10.193
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> 113.826
(<r2>)1/2 10.669