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

using model chemistry: CID/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 CID/3-21G*
 hartrees
Energy at 0K-223.946572
Energy at 298.15K-223.952550
HF Energy-223.510685
Nuclear repulsion energy158.290785
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 CID/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' 3349 3116 8.73      
2 A' 3311 3081 5.53      
3 A' 3167 2946 0.33      
4 A' 1662 1546 23.43      
5 A' 1594 1483 6.49      
6 A' 1533 1427 12.30      
7 A' 1356 1262 16.65      
8 A' 1343 1249 1.72      
9 A' 1317 1225 11.48      
10 A' 1014 944 43.32      
11 A' 968 900 4.15      
12 A' 915 851 5.46      
13 A' 867 807 13.22      
14 A' 839 781 12.46      
15 A" 3214 2991 0.88      
16 A" 1227 1142 0.04      
17 A" 1062 988 21.75      
18 A" 1004 935 0.01      
19 A" 813 756 10.85      
20 A" 591 550 24.06      
21 A" 397 370 10.33      

Unscaled Zero Point Vibrational Energy (zpe) 15770.6 cm-1
Scaled (by 0.9305) Zero Point Vibrational Energy (zpe) 14674.6 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 CID/3-21G*
ABC
0.30849 0.28464 0.15233

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.136 0.555 0.000
C2 0.772 -0.882 0.000
N3 -0.484 -1.142 0.000
C4 -1.177 0.199 0.000
C5 0.000 1.169 0.000
H6 1.557 -1.615 0.000
H7 -1.799 0.283 0.892
H8 -1.799 0.283 -0.892
H9 -0.086 2.243 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.48272.34622.34031.29082.21133.07943.07942.0831
C21.48271.28232.22862.19131.07422.96002.96003.2403
N32.34621.28231.50972.36142.09462.13442.13443.4084
C42.34032.22861.50971.52573.28111.09031.09032.3173
C51.29082.19132.36141.52573.19002.19502.19501.0772
H62.21131.07422.09463.28113.19003.95723.95724.1932
H73.07942.96002.13441.09032.19503.95721.78302.7519
H83.07942.96002.13441.09032.19503.95721.78302.7519
H92.08313.24033.40842.31731.07724.19322.75192.7519

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 115.919 N1 C2 H6 118.858
N1 C5 C4 112.122 N1 C5 H9 122.954
C2 N1 C5 104.178 C2 N3 C4 105.633
N3 C2 H6 125.223 N3 C4 C5 102.147
N3 C4 H7 109.300 N3 C4 H8 109.300
C4 C5 H9 124.924 C5 C4 H7 113.029
C5 C4 H8 113.029 H7 C4 H8 109.712
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability