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All results from a given calculation for C4H4N2 (Pyrazine)

using model chemistry: BLYP/STO-3G

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/STO-3G
 hartrees
Energy at 0K-260.849017
Energy at 298.15K-260.854238
Nuclear repulsion energy200.473878
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/STO-3G
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 3330 3081 0.00      
2 Ag 1568 1450 0.00      
3 Ag 1237 1145 0.00      
4 Ag 974 901 0.00      
5 Ag 602 557 0.00      
6 Au 959 887 0.00      
7 Au 305 283 0.00      
8 B1g 905 837 0.00      
9 B1u 3310 3062 2.84      
10 B1u 1493 1381 22.72      
11 B1u 1106 1023 2.09      
12 B1u 985 911 3.17      
13 B2g 947 876 0.00      
14 B2g 727 672 0.00      
15 B2u 3325 3076 3.02      
16 B2u 1408 1303 35.01      
17 B2u 1123 1039 8.47      
18 B2u 1041 964 1.90      
19 B3g 3312 3065 0.00      
20 B3g 1478 1368 0.00      
21 B3g 1327 1227 0.00      
22 B3g 673 623 0.00      
23 B3u 770 712 12.27      
24 B3u 370 342 10.99      

Unscaled Zero Point Vibrational Energy (zpe) 16637.1 cm-1
Scaled (by 0.9252) Zero Point Vibrational Energy (zpe) 15392.7 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 BLYP/STO-3G
ABC
0.20259 0.17804 0.09476

See section I.F.4 to change rotational constant units
Geometric Data calculated at BLYP/STO-3G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.510
N2 0.000 0.000 -1.510
C3 0.000 1.164 0.712
C4 0.000 -1.164 0.712
C5 0.000 -1.164 -0.712
C6 0.000 1.164 -0.712
H7 0.000 2.125 1.270
H8 0.000 -2.125 1.270
H9 0.000 -2.125 -1.270
H10 0.000 2.125 -1.270

Atom - Atom Distances (Å)
  N1 N2 C3 C4 C5 C6 H7 H8 H9 H10
N13.02011.41131.41132.50822.50822.13812.13813.49923.4992
N23.02012.50822.50821.41131.41133.49923.49922.13812.1381
C31.41132.50822.32762.72841.42351.11143.33553.83962.2027
C41.41132.50822.32761.42352.72843.33551.11142.20273.8396
C52.50821.41132.72841.42352.32763.83962.20271.11143.3355
C62.50821.41131.42352.72842.32762.20273.83963.33551.1114
H72.13813.49921.11143.33553.83962.20274.24934.95092.5406
H82.13813.49923.33551.11142.20273.83964.24932.54064.9509
H93.49922.13813.83962.20271.11143.33554.95092.54064.2493
H103.49922.13812.20273.83963.33551.11142.54064.95094.2493

picture of Pyrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C3 C6 124.448 N1 C3 H7 115.382
N1 C4 C5 124.448 N1 C4 H8 115.382
N2 C5 C4 124.448 N2 C5 H9 115.382
N2 C6 C3 124.448 N2 C6 H10 115.382
C3 N1 C4 111.104 C3 C6 H10 120.170
C4 C5 H9 120.170 C5 N2 C6 111.104
C5 C4 H8 120.170 C6 C3 H7 120.170
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.187      
2 N -0.187      
3 C -0.002      
4 C -0.002      
5 C -0.002      
6 C -0.002      
7 H 0.096      
8 H 0.096      
9 H 0.096      
10 H 0.096      


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 -32.563 0.000 0.000
y 0.000 -26.110 0.000
z 0.000 0.000 -38.626
Traceless
 xyz
x -0.196 0.000 0.000
y 0.000 9.484 0.000
z 0.000 0.000 -9.289
Polar
3z2-r2-18.578
x2-y2-6.453
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.189 0.000 0.000
y 0.000 7.097 0.000
z 0.000 0.000 5.432


<r2> (average value of r2) Å2
<r2> 121.358
(<r2>)1/2 11.016