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

using model chemistry: CISD/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 CISD/6-31G
 hartrees
Energy at 0K-225.109162
Energy at 298.15K-225.115180
HF Energy-224.669685
Nuclear repulsion energy158.696614
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 CISD/6-31G
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' 3362 3153 7.17      
2 A' 3323 3116 4.82      
3 A' 3146 2950 0.71      
4 A' 1688 1583 31.05      
5 A' 1612 1511 8.64      
6 A' 1527 1432 18.03      
7 A' 1361 1277 22.83      
8 A' 1346 1262 4.33      
9 A' 1337 1254 7.12      
10 A' 1026 962 52.76      
11 A' 992 931 1.33      
12 A' 963 903 4.35      
13 A' 891 836 15.69      
14 A' 886 831 6.77      
15 A" 3193 2994 2.10      
16 A" 1208 1133 0.09      
17 A" 1073 1006 18.03      
18 A" 982 921 0.17      
19 A" 814 763 10.03      
20 A" 589 552 29.45      
21 A" 402 377 9.02      

Unscaled Zero Point Vibrational Energy (zpe) 15859.7 cm-1
Scaled (by 0.9378) Zero Point Vibrational Energy (zpe) 14873.2 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 CISD/6-31G
ABC
0.30889 0.28821 0.15339

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.137 0.540 0.000
C2 0.773 -0.877 0.000
N3 -0.493 -1.130 0.000
C4 -1.170 0.200 0.000
C5 0.000 1.165 0.000
H6 1.546 -1.627 0.000
H7 -1.804 0.292 0.886
H8 -1.804 0.292 -0.886
H9 -0.070 2.243 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.46282.33362.33251.29802.20503.08233.08232.0874
C21.46281.29102.22212.18391.07682.96592.96593.2319
N32.33361.29101.49292.34792.09842.12812.12813.3997
C42.33252.22211.49291.51723.27371.09351.09352.3209
C51.29802.18392.34791.51723.19182.19192.19191.0799
H62.20501.07682.09843.27373.19183.96163.96164.1937
H73.08232.96592.12811.09352.19193.96161.77232.7572
H83.08232.96592.12811.09352.19193.96161.77232.7572
H92.08743.23193.39972.32091.07994.19372.75722.7572

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 115.717 N1 C2 H6 119.729
N1 C5 C4 111.665 N1 C5 H9 122.503
C2 N1 C5 104.408 C2 N3 C4 105.690
N3 C2 H6 124.554 N3 C4 C5 102.521
N3 C4 H7 109.768 N3 C4 H8 109.768
C4 C5 H9 125.832 C5 C4 H7 113.189
C5 C4 H8 113.189 H7 C4 H8 108.261
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability