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 (1H-Imidazole)

using model chemistry: HF/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at HF/6-311G**
 hartrees
Energy at 0K-224.869815
Energy at 298.15K-224.876040
HF Energy-224.869815
Nuclear repulsion energy165.033306
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/6-311G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3911 3553 94.60      
2 A' 3430 3116 3.61      
3 A' 3400 3088 3.40      
4 A' 3396 3085 7.79      
5 A' 1727 1569 25.34      
6 A' 1648 1497 25.44      
7 A' 1574 1430 22.38      
8 A' 1486 1350 9.32      
9 A' 1397 1269 0.58      
10 A' 1244 1130 5.38      
11 A' 1223 1111 4.79      
12 A' 1175 1067 14.54      
13 A' 1147 1042 60.57      
14 A' 1020 927 2.04      
15 A' 985 894 7.49      
16 A" 1002 911 0.03      
17 A" 971 882 19.03      
18 A" 837 760 53.85      
19 A" 731 664 13.38      
20 A" 691 628 5.33      
21 A" 542 492 126.26      

Unscaled Zero Point Vibrational Energy (zpe) 16766.7 cm-1
Scaled (by 0.9085) Zero Point Vibrational Energy (zpe) 15232.6 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 HF/6-311G**
ABC
0.33114 0.32195 0.16324

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-311G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.095 0.000
C2 -1.075 0.279 0.000
C3 1.110 0.288 0.000
N4 -0.741 -0.964 0.000
C5 0.630 -0.974 0.000
H6 -0.013 2.086 0.000
H7 -2.078 0.655 0.000
H8 2.104 0.678 0.000
H9 1.183 -1.890 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.34941.37192.18862.16270.99152.12392.14503.2108
C21.34942.18421.28722.11582.09641.07133.20383.1305
C31.37192.18422.23481.34992.11963.20841.06852.1794
N42.18861.28722.23481.37163.13652.09973.28562.1351
C52.16272.11581.34991.37163.12703.16032.21411.0698
H60.99152.09642.11963.13653.12702.51282.54214.1522
H72.12391.07133.20842.09973.16032.51284.18204.1362
H82.14503.20381.06853.28562.21412.54214.18202.7289
H93.21083.13052.17942.13511.06984.15224.13622.7289

picture of 1H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 N4 112.200 N1 C2 H7 122.237
N1 C3 C5 105.231 N1 C3 H8 122.544
C2 N1 C3 106.764 C2 N1 H6 126.489
C2 N4 C5 105.410 C3 N1 H6 126.746
C3 C5 N4 110.395 C3 C5 H9 128.122
N4 C2 H7 125.563 N4 C5 H9 121.483
C5 C3 H8 132.226
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.408      
2 C 0.254      
3 C 0.013      
4 N -0.392      
5 C -0.035      
6 H 0.238      
7 H 0.113      
8 H 0.113      
9 H 0.104      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.092 3.682 0.000 3.841
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.283 -3.523 0.000
y -3.523 -25.621 0.000
z 0.000 0.000 -31.973
Traceless
 xyz
x 2.513 -3.523 0.000
y -3.523 3.507 0.000
z 0.000 0.000 -6.021
Polar
3z2-r2-12.042
x2-y2-0.663
xy-3.523
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.758 -0.107 0.000
y -0.107 6.714 0.000
z 0.000 0.000 3.298


<r2> (average value of r2) Å2
<r2> 78.525
(<r2>)1/2 8.861