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 C3H3N2 (imidazolyl radical)

using model chemistry: SVWN/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 2B1
Energy calculated at SVWN/3-21G
 hartrees
Energy at 0K-223.036007
Energy at 298.15K-223.040098
HF Energy-223.036007
Nuclear repulsion energy151.190509
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 SVWN/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3215 3157 0.13      
2 A1 3200 3142 0.83      
3 A1 1332 1307 22.14      
4 A1 1261 1238 25.71      
5 A1 1124 1104 46.83      
6 A1 930 913 6.41      
7 A1 874 859 0.02      
8 A2 861 846 0.00      
9 A2 542 532 0.00      
10 B1 846 830 2.02      
11 B1 692 680 67.68      
12 B1 340 333 9.77      
13 B2 3185 3128 0.15      
14 B2 1415 1389 0.06      
15 B2 1240 1218 0.00      
16 B2 1155 1134 6.02      
17 B2 931 914 58.71      
18 B2 664 652 26.08      

Unscaled Zero Point Vibrational Energy (zpe) 11902.6 cm-1
Scaled (by 0.9819) Zero Point Vibrational Energy (zpe) 11687.1 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 SVWN/3-21G
ABC
0.34450 0.30074 0.16057

See section I.F.4 to change rotational constant units
Geometric Data calculated at SVWN/3-21G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.121
N2 0.000 1.177 0.373
N3 0.000 -1.177 0.373
C4 0.000 0.743 -0.888
C5 0.000 -0.743 -0.888
H6 0.000 0.000 2.209
H7 0.000 1.410 -1.748
H8 0.000 -1.410 -1.748

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8
C11.39481.39482.14172.14171.08763.19693.1969
N21.39482.35401.33302.29672.18092.13363.3452
N31.39482.35402.29671.33302.18093.34522.1336
C42.14171.33302.29671.48603.18431.08872.3186
C52.14172.29671.33301.48603.18432.31861.0887
H61.08762.18092.18093.18433.18434.20054.2005
H73.19692.13363.34521.08872.31864.20052.8200
H83.19693.34522.13362.31861.08874.20052.8200

picture of imidazolyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C4 103.447 C1 N3 C5 103.447
N2 C1 N3 115.101 N2 C1 H6 122.450
N2 C4 C5 109.002 N2 C4 H7 123.214
N3 C1 H6 122.450 N3 C5 C4 109.002
N3 C5 H8 123.214 C4 C5 H8 127.783
C5 C4 H7 127.783
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at SVWN/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.133      
2 N -0.427      
3 N -0.427      
4 C -0.019      
5 C -0.019      
6 H 0.267      
7 H 0.246      
8 H 0.246      


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 -1.510 1.510
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -29.598 0.000 0.000
y 0.000 -34.318 0.000
z 0.000 0.000 -21.801
Traceless
 xyz
x -1.538 0.000 0.000
y 0.000 -8.619 0.000
z 0.000 0.000 10.157
Polar
3z2-r220.313
x2-y24.721
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.093 0.000 0.000
y 0.000 5.406 0.000
z 0.000 0.000 7.040


<r2> (average value of r2) Å2
<r2> 77.772
(<r2>)1/2 8.819