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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-225.406786
Energy at 298.15K-225.412836
HF Energy-224.797118
Nuclear repulsion energy161.452410
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' 3354 3105 14.25      
2 A' 3330 3083 8.90      
3 A' 3174 2938 2.54      
4 A' 1787 1654 48.28      
5 A' 1699 1573 18.37      
6 A' 1520 1407 12.58      
7 A' 1407 1303 29.15      
8 A' 1394 1291 10.43      
9 A' 1352 1252 4.03      
10 A' 1100 1018 64.47      
11 A' 1066 987 13.22      
12 A' 999 925 1.69      
13 A' 925 857 3.71      
14 A' 915 847 13.94      
15 A" 3217 2978 3.17      
16 A" 1235 1143 0.24      
17 A" 1077 997 13.53      
18 A" 1022 946 0.28      
19 A" 809 749 4.49      
20 A" 588 544 28.22      
21 A" 385 356 6.25      

Unscaled Zero Point Vibrational Energy (zpe) 16176.7 cm-1
Scaled (by 0.9258) Zero Point Vibrational Energy (zpe) 14976.4 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
0.32372 0.29562 0.15906

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 -1.195 0.351 0.000
C2 0.000 1.130 0.000
N3 1.108 0.506 0.000
C4 0.734 -0.897 0.000
C5 -0.762 -0.850 0.000
H6 -0.077 2.207 0.000
H7 1.139 -1.401 0.879
H8 1.139 -1.401 -0.879
H9 -1.424 -1.704 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.42682.30852.29811.27732.16663.04823.04822.0683
C21.42681.27192.15642.12221.07922.91182.91183.1724
N32.30851.27191.45192.30992.07302.10022.10023.3611
C42.29812.15641.45191.49683.20821.09131.09132.3044
C51.27732.12222.30991.49683.13302.16542.16541.0808
H62.16661.07922.07303.20823.13303.90753.90754.1368
H73.04822.91182.10021.09132.16543.90751.75892.7264
H83.04822.91182.10021.09132.16543.90751.75892.7264
H92.06833.17243.36112.30441.08084.13682.72642.7264

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 117.491 N1 C2 H6 119.014
N1 C5 C4 111.628 N1 C5 H9 122.373
C2 N1 C5 103.266 C2 N3 C4 104.489
N3 C2 H6 123.496 N3 C4 C5 103.127
N3 C4 H7 110.539 N3 C4 H8 110.539
C4 C5 H9 125.999 C5 C4 H7 112.636
C5 C4 H8 112.636 H7 C4 H8 107.381
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability