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

using model chemistry: MP2/cc-pVQZ

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/cc-pVQZ
 hartrees
Energy at 0K-225.816332
Energy at 298.15K-225.822245
HF Energy-224.888320
Nuclear repulsion energy161.091105
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/cc-pVQZ
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' 3259 3091 6.89      
2 A' 3238 3071 4.21      
3 A' 3087 2927 1.24      
4 A' 1608 1525 27.19      
5 A' 1524 1445 5.06      
6 A' 1403 1330 22.70      
7 A' 1325 1257 24.39      
8 A' 1307 1240 4.93      
9 A' 1259 1194 5.70      
10 A' 1054 1000 50.10      
11 A' 1014 962 10.85      
12 A' 961 912 2.82      
13 A' 878 833 10.11      
14 A' 876 831 7.01      
15 A" 3137 2975 0.00      
16 A" 1164 1104 0.53      
17 A" 997 945 16.03      
18 A" 956 907 1.44      
19 A" 750 711 5.93      
20 A" 562 533 18.74      
21 A" 357 339 6.00      

Unscaled Zero Point Vibrational Energy (zpe) 15357.3 cm-1
Scaled (by 0.9484) Zero Point Vibrational Energy (zpe) 14564.9 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/cc-pVQZ
ABC
0.32204 0.29507 0.15849

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/cc-pVQZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.195 0.362 0.000
C2 0.000 1.134 0.000
N3 1.118 0.498 0.000
C4 0.726 -0.900 0.000
C5 -0.762 -0.854 0.000
H6 -0.067 2.211 0.000
H7 1.131 -1.405 0.878
H8 1.131 -1.405 -0.878
H9 -1.433 -1.701 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.42272.31662.29801.29082.16593.05033.05032.0770
C21.42271.28602.15922.12911.07912.91472.91473.1767
N32.31661.28601.45132.31542.08302.09532.09533.3674
C42.29802.15921.45131.48863.21011.09141.09142.3024
C51.29082.12912.31541.48863.14292.15872.15871.0805
H62.16591.07912.08303.21013.14293.90893.90894.1438
H73.05032.91472.09531.09142.15873.90891.75702.7264
H83.05032.91472.09531.09142.15873.90891.75702.7264
H92.07703.17673.36742.30241.08054.14382.72642.7264

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 117.486 N1 C2 H6 119.294
N1 C5 C4 111.348 N1 C5 H9 122.058
C2 N1 C5 103.268 C2 N3 C4 103.988
N3 C2 H6 123.220 N3 C4 C5 103.910
N3 C4 H7 110.187 N3 C4 H8 110.187
C4 C5 H9 126.593 C5 C4 H7 112.681
C5 C4 H8 112.681 H7 C4 H8 107.204
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability