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

using model chemistry: MP4=FULL/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 MP4=FULL/3-21G
 hartrees
Energy at 0K-224.054399
Energy at 298.15K-224.060178
HF Energy-223.503639
Nuclear repulsion energy155.906412
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 MP4=FULL/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3237 3168        
2 A' 3201 3133        
3 A' 3069 3004        
4 A' 1504 1472        
5 A' 1493 1461        
6 A' 1405 1376        
7 A' 1292 1265        
8 A' 1284 1257        
9 A' 1248 1222        
10 A' 957 936        
11 A' 905 886        
12 A' 859 841        
13 A' 800 783        
14 A' 746 731        
15 A" 3120 3054        
16 A" 1173 1148        
17 A" 1001 980        
18 A" 926 907        
19 A" 764 748        
20 A" 553 542        
21 A" 375 367        

Unscaled Zero Point Vibrational Energy (zpe) 14956.1 cm-1
Scaled (by 0.9788) Zero Point Vibrational Energy (zpe) 14639.0 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 MP4=FULL/3-21G
ABC
0.30023 0.27522 0.14769

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4=FULL/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.164 -0.565 0.000
C2 -0.778 0.895 0.000
N3 0.502 1.162 0.000
C4 1.192 -0.208 0.000
C5 0.000 -1.182 0.000
H6 -1.567 1.637 0.000
H7 1.816 -0.291 0.899
H8 1.816 -0.291 -0.899
H9 0.087 -2.264 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.51012.39962.38251.31692.23893.12473.12472.1095
C21.51011.30712.25712.21721.08322.99062.99063.2750
N32.39961.30711.53412.39692.12192.15622.15623.4513
C42.38252.25711.53411.53903.31841.09811.09812.3344
C51.31692.21722.39691.53903.22482.21362.21361.0860
H62.23891.08322.12193.31843.22483.99623.99624.2371
H73.12472.99062.15621.09812.21363.99621.79892.7734
H83.12472.99062.15621.09812.21363.99621.79892.7734
H92.10953.27503.45132.33441.08604.23712.77342.7734

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 116.622 N1 C2 H6 118.459
N1 C5 C4 112.843 N1 C5 H9 122.487
C2 N1 C5 103.094 C2 N3 C4 104.925
N3 C2 H6 124.919 N3 C4 C5 102.517
N3 C4 H7 108.882 N3 C4 H8 108.882
C4 C5 H9 124.670 C5 C4 H7 113.094
C5 C4 H8 113.094 H7 C4 H8 109.993
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability