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

using model chemistry: MP2/CEP-121G

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/CEP-121G
 hartrees
Energy at 0K-38.481620
Energy at 298.15K-38.487419
HF Energy-37.990956
Nuclear repulsion energy80.810169
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/CEP-121G
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' 3227 3149 8.25      
2 A' 3191 3115 7.95      
3 A' 3019 2947 2.33      
4 A' 1479 1444 11.37      
5 A' 1458 1423 18.93      
6 A' 1397 1363 3.44      
7 A' 1284 1253 11.55      
8 A' 1272 1241 5.93      
9 A' 1263 1233 12.05      
10 A' 960 937 36.82      
11 A' 931 908 6.06      
12 A' 908 887 1.10      
13 A' 825 805 16.78      
14 A' 806 787 3.92      
15 A" 3090 3016 4.30      
16 A" 1118 1091 0.03      
17 A" 1008 984 22.31      
18 A" 876 855 0.82      
19 A" 747 729 18.67      
20 A" 541 528 19.38      
21 A" 358 350 8.06      

Unscaled Zero Point Vibrational Energy (zpe) 14879.2 cm-1
Scaled (by 0.976) Zero Point Vibrational Energy (zpe) 14522.1 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 MP2/CEP-121G
ABC
0.29751 0.27503 0.14696

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.174 0.547 0.000
C2 0.785 -0.894 0.000
N3 -0.520 -1.155 0.000
C4 -1.191 0.211 0.000
C5 0.000 1.189 0.000
H6 1.562 -1.654 0.000
H7 -1.825 0.298 0.898
H8 -1.825 0.298 -0.898
H9 -0.050 2.277 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.49262.40132.38861.33762.23493.14023.14022.1191
C21.49261.33032.26392.22561.08693.00623.00623.2793
N32.40131.33031.52282.40112.14032.15002.15003.4649
C42.38862.26391.52281.54103.32531.10251.10252.3605
C51.33762.22562.40111.54103.24342.22062.22061.0897
H62.23491.08692.14033.32533.24344.01084.01084.2487
H73.14023.00622.15001.10252.22064.01081.79572.8066
H83.14023.00622.15001.10252.22064.01081.79572.8066
H92.11913.27933.46492.36051.08974.24872.80662.8066

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 116.443 N1 C2 H6 119.249
N1 C5 C4 111.959 N1 C5 H9 121.286
C2 N1 C5 103.561 C2 N3 C4 104.831
N3 C2 H6 124.308 N3 C4 C5 103.206
N3 C4 H7 108.907 N3 C4 H8 108.907
C4 C5 H9 126.756 C5 C4 H7 113.247
C5 C4 H8 113.247 H7 C4 H8 109.051
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability