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 C3H4N2 (2H-Imidazole)

using model chemistry: HF/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at HF/6-31G(2df,p)
 hartrees
Energy at 0K-224.749897
Energy at 298.15K-224.756133
HF Energy-224.749897
Nuclear repulsion energy168.129724
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/6-31G(2df,p)
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 3384 3064 17.61      
2 A1 3217 2913 7.01      
3 A1 1900 1720 36.81      
4 A1 1564 1416 0.87      
5 A1 1515 1372 17.26      
6 A1 1321 1196 1.35      
7 A1 1105 1001 2.66      
8 A1 1019 923 16.00      
9 A2 1265 1145 0.00      
10 A2 1050 951 0.00      
11 A2 593 537 0.00      
12 B1 3258 2950 2.83      
13 B1 1133 1026 24.33      
14 B1 926 838 2.22      
15 B1 400 362 38.41      
16 B2 3367 3049 10.55      
17 B2 1966 1780 0.18      
18 B2 1540 1394 40.81      
19 B2 1368 1239 2.16      
20 B2 1163 1053 42.58      
21 B2 998 904 71.17      

Unscaled Zero Point Vibrational Energy (zpe) 17025.2 cm-1
Scaled (by 0.9055) Zero Point Vibrational Energy (zpe) 15416.4 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/6-31G(2df,p)
ABC
0.36360 0.31212 0.17344

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-31G(2df,p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.191
N2 0.000 0.997 0.273
N3 0.000 -0.997 0.273
C4 0.000 0.727 -0.930
C5 0.000 -0.727 -0.930
H6 -0.887 0.000 1.814
H7 0.887 0.000 1.814
H8 0.000 1.455 -1.718
H9 0.000 -1.455 -1.718

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8 H9
C11.35541.35542.24192.24191.08401.08403.25263.2526
N21.35541.99341.23202.10162.03852.03852.04263.1578
N31.35541.99342.10161.23202.03852.03853.15782.0426
C42.24191.23202.10161.45432.97342.97341.07292.3199
C52.24192.10161.23201.45432.97342.97342.31991.0729
H61.08402.03852.03852.97342.97341.77483.92123.9212
H71.08402.03852.03852.97342.97341.77483.92123.9212
H83.25262.04263.15781.07292.31993.92123.92122.9093
H93.25263.15782.04262.31991.07293.92123.92122.9093

picture of 2H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C4 120.027 C1 N3 C5 120.027
N2 C1 N3 94.672 N2 C1 H6 112.903
N2 C1 H7 112.903 N2 C4 C5 102.637
N2 C4 H8 124.667 N3 C1 H6 112.903
N3 C1 H7 112.903 N3 C5 C4 102.637
N3 C5 H9 124.667 C4 C5 H9 132.695
C5 C4 H8 132.695 H6 C1 H7 109.906
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.074      
2 N -0.207      
3 N -0.207      
4 C -0.107      
5 C -0.107      
6 H 0.179      
7 H 0.179      
8 H 0.172      
9 H 0.172      


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 -1.108 1.108
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -28.212 0.000 0.000
y 0.000 -34.579 0.000
z 0.000 0.000 -21.596
Traceless
 xyz
x -0.125 0.000 0.000
y 0.000 -9.675 0.000
z 0.000 0.000 9.799
Polar
3z2-r219.599
x2-y26.367
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.609 0.000 0.000
y 0.000 4.885 0.000
z 0.000 0.000 7.591


<r2> (average value of r2) Å2
<r2> 76.031
(<r2>)1/2 8.720