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

using model chemistry: QCISD/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at QCISD/6-31G*
 hartrees
Energy at 0K-225.524894
Energy at 298.15K-225.530830
HF Energy-224.794426
Nuclear repulsion energy160.056344
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 QCISD/6-31G*
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' 3256 3100 13.87      
2 A' 3233 3078 8.96      
3 A' 3082 2935 2.81      
4 A' 1690 1609 36.95      
5 A' 1605 1528 11.12      
6 A' 1478 1407 12.67      
7 A' 1353 1288 23.20      
8 A' 1343 1279 8.42      
9 A' 1306 1243 4.17      
10 A' 1049 999 58.53      
11 A' 1020 971 7.83      
12 A' 969 923 2.09      
13 A' 890 848 6.18      
14 A' 883 841 10.50      
15 A" 3124 2975 3.30      
16 A" 1189 1132 0.25      
17 A" 1029 980 13.22      
18 A" 959 913 0.02      
19 A" 775 738 6.24      
20 A" 563 536 24.85      
21 A" 373 355 6.11      

Unscaled Zero Point Vibrational Energy (zpe) 15582.5 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 14839.2 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 QCISD/6-31G*
ABC
0.31854 0.29036 0.15635

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.208 0.358 0.000
C2 0.000 1.139 0.000
N3 1.121 0.507 0.000
C4 0.737 -0.905 0.000
C5 -0.767 -0.857 0.000
H6 -0.073 2.224 0.000
H7 1.147 -1.411 0.886
H8 1.147 -1.411 -0.886
H9 -1.435 -1.716 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.43852.33392.31861.29212.18373.07503.07502.0858
C21.43851.28712.17312.13811.08702.93292.93293.1953
N32.33391.28711.46412.32922.09122.11312.11313.3880
C42.31862.17311.46411.50403.23211.09911.09912.3182
C51.29212.13812.32921.50403.15752.17982.17981.0885
H62.18371.08702.09123.23213.15753.93493.93494.1681
H73.07502.93292.11311.09912.17983.93491.77112.7465
H83.07502.93292.11311.09912.17983.93491.77112.7465
H92.08583.19533.38802.31821.08854.16812.74652.7465

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 117.700 N1 C2 H6 119.037
N1 C5 C4 111.813 N1 C5 H9 122.132
C2 N1 C5 102.941 C2 N3 C4 104.162
N3 C2 H6 123.264 N3 C4 C5 103.384
N3 C4 H7 110.239 N3 C4 H8 110.239
C4 C5 H9 126.055 C5 C4 H7 112.807
C5 C4 H8 112.807 H7 C4 H8 107.362
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability