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All results from a given calculation for C3H4N2 (1H-Imidazole)

using model chemistry: ROMP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at ROMP2/3-21G*
 hartrees
Energy at 0K-224.027874
Energy at 298.15K-224.033862
HF Energy-223.543101
Nuclear repulsion energy160.241162
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 ROMP2/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3602 3602        
2 A' 3329 3329        
3 A' 3308 3308        
4 A' 3303 3303        
5 A' 1516 1516        
6 A' 1457 1457        
7 A' 1398 1398        
8 A' 1323 1323        
9 A' 1249 1249        
10 A' 1163 1163        
11 A' 1088 1088        
12 A' 1083 1083        
13 A' 1030 1030        
14 A' 953 953        
15 A' 908 908        
16 A" 848 848        
17 A" 817 817        
18 A" 734 734        
19 A" 680 680        
20 A" 656 656        
21 A" 611 611        

Unscaled Zero Point Vibrational Energy (zpe) 15528.2 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 15528.2 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 ROMP2/3-21G*
ABC
0.31220 0.30277 0.15371

See section I.F.4 to change rotational constant units
Geometric Data calculated at ROMP2/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.126 0.000
C2 -1.116 0.291 0.000
C3 1.137 0.302 0.000
N4 -0.760 -1.008 0.000
C5 0.660 -0.997 0.000
H6 -0.000 2.139 0.000
H7 -2.126 0.668 0.000
H8 2.138 0.702 0.000
H9 1.223 -1.915 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.39391.40412.26502.22351.01312.17442.17963.2779
C21.39392.25341.34702.19462.15861.07743.28003.2158
C31.40412.25342.30551.38432.16053.28321.07762.2191
N42.26501.34702.30551.42033.23722.16183.36462.1809
C52.22352.19461.38431.42033.20513.24572.25161.0768
H61.01312.15862.16053.23723.20512.58472.57654.2348
H72.17441.07743.28322.16183.24572.58474.26374.2294
H82.17963.28001.07763.36462.25162.57654.26372.7722
H93.27793.21582.21912.18091.07684.23484.22942.7722

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 111.451 N1 C2 H7 122.738
N1 C3 C5 105.767 N1 C3 H8 122.325
C2 N1 C3 107.294 C2 N1 H6 126.766
C2 N4 C5 104.912 C3 N1 H6 125.940
C3 C5 N4 110.576 C3 C5 H9 128.332
N4 C2 H7 125.811 N4 C5 H9 121.091
C5 C3 H8 131.908
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at ROMP2/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.865      
2 C 0.350      
3 C 0.028      
4 N -0.590      
5 C -0.078      
6 H 0.378      
7 H 0.267      
8 H 0.263      
9 H 0.247      


Electric dipole moments


Electric Quadrupole moment
Quadrupole components in D Å


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> 82.247
(<r2>)1/2 9.069