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All results from a given calculation for C3H4N2 (4H-Imidazole)

using model chemistry: MP2/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/3-21G
 hartrees
Energy at 0K-223.998345
Energy at 298.15K-224.004180
HF Energy-223.504949
Nuclear repulsion energy156.439623
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 MP2/3-21G
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' 3293 3143 7.36      
2 A' 3259 3110 5.38      
3 A' 3122 2980 0.01      
4 A' 1522 1453 15.69      
5 A' 1495 1427 9.08      
6 A' 1409 1345 0.78      
7 A' 1312 1252 2.95      
8 A' 1304 1244 11.44      
9 A' 1255 1198 12.79      
10 A' 974 929 30.03      
11 A' 917 875 5.17      
12 A' 889 849 4.87      
13 A' 811 774 8.35      
14 A' 767 732 14.88      
15 A" 3177 3032 0.36      
16 A" 1185 1131 0.04      
17 A" 1019 972 20.77      
18 A" 949 906 0.19      
19 A" 777 742 15.34      
20 A" 564 539 17.43      
21 A" 381 364 10.83      

Unscaled Zero Point Vibrational Energy (zpe) 15189.0 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 14497.9 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 MP2/3-21G
ABC
0.30211 0.27751 0.14878

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.162 0.558 0.000
C2 0.774 -0.891 0.000
N3 -0.505 -1.158 0.000
C4 -1.185 0.212 0.000
C5 0.000 1.177 0.000
H6 1.557 -1.634 0.000
H7 -1.807 0.296 0.896
H8 -1.807 0.296 -0.896
H9 -0.080 2.256 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.50072.39272.37251.31682.22713.11303.11302.1037
C21.50071.30652.24862.20841.07912.97932.97933.2609
N32.39271.30651.52992.38892.11642.14782.14783.4400
C42.37252.24861.52991.52773.30571.09431.09432.3226
C51.31682.20842.38891.52773.21322.20132.20131.0817
H62.22711.07912.11643.30573.21323.98083.98084.2200
H73.11302.97932.14781.09432.20133.98081.79242.7616
H83.11302.97932.14781.09432.20133.98081.79242.7616
H92.10373.26093.44002.32261.08174.22002.76162.7616

picture of 4H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 N3 116.772 N1 C2 H6 118.465
N1 C5 C4 112.829 N1 C5 H9 122.284
C2 N1 C5 103.031 C2 N3 C4 104.610
N3 C2 H6 124.763 N3 C4 C5 102.757
N3 C4 H7 108.722 N3 C4 H8 108.722
C4 C5 H9 124.887 C5 C4 H7 113.145
C5 C4 H8 113.145 H7 C4 H8 109.961
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability