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All results from a given calculation for C3H4N2 (1H-Imidazole)

using model chemistry: G4

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at G4
 hartrees
Energy at 0K-226.100075
Energy at 298.15K-226.095337
HF Energy-226.231980
Nuclear repulsion energy163.336769
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 B3LYP/6-31G(2df,p)
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' 3669 3541 49.83      
2 A' 3283 3168 2.08      
3 A' 3253 3139 0.47      
4 A' 3250 3136 6.75      
5 A' 1562 1507 13.33      
6 A' 1509 1456 15.88      
7 A' 1435 1385 14.89      
8 A' 1369 1321 7.26      
9 A' 1287 1242 0.40      
10 A' 1165 1124 5.28      
11 A' 1153 1113 1.99      
12 A' 1102 1063 15.51      
13 A' 1079 1041 34.00      
14 A' 945 912 1.24      
15 A' 906 874 9.89      
16 A" 861 831 5.13      
17 A" 814 786 26.95      
18 A" 730 704 20.98      
19 A" 686 662 2.98      
20 A" 648 625 12.70      
21 A" 527 508 82.86      

Unscaled Zero Point Vibrational Energy (zpe) 15615.0 cm-1
Scaled (by 0.965) Zero Point Vibrational Energy (zpe) 15068.5 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 B3LYP/6-31G(2df,p)
ABC
0.32599 0.31400 0.15994

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.103 0.000
C2 -1.089 0.282 0.000
C3 1.118 0.299 0.000
N4 -0.742 -0.984 0.000
C5 0.635 -0.983 0.000
H6 -0.009 2.109 0.000
H7 -2.098 0.665 0.000
H8 2.115 0.707 0.000
H9 1.197 -1.904 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.36361.37772.21502.18061.00592.14362.15163.2369
C21.36362.20691.31252.13782.12251.07983.23153.1628
C31.37772.20692.25921.36942.13263.23731.07712.2041
N42.21501.31252.25921.37673.17872.13503.31952.1461
C52.18062.13781.36941.37673.15823.19142.24621.0793
H61.00592.12252.13263.17873.15822.54032.54454.1905
H72.14361.07983.23732.13503.19142.54034.21334.1783
H82.15163.23151.07713.31952.24622.54454.21332.7678
H93.23693.16282.20412.14611.07934.19054.17832.7678

picture of 1H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 N4 111.875 N1 C2 H7 122.087
N1 C3 C5 105.277 N1 C3 H8 122.052
C2 N1 C3 106.999 C2 N1 H6 126.591
C2 N4 C5 105.394 C3 N1 H6 126.409
C3 C5 N4 110.454 C3 C5 H9 128.142
N4 C2 H7 126.038 N4 C5 H9 121.404
C5 C3 H8 132.671
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.225      
2 C 0.020      
3 C -0.104      
4 N -0.248      
5 C -0.073      
6 H 0.267      
7 H 0.129      
8 H 0.127      
9 H 0.108      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.076 3.456 0.000 3.619
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 79.435
(<r2>)1/2 8.913