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

using model chemistry: CCD/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CCD/3-21G*
 hartrees
Energy at 0K-224.019277
Energy at 298.15K-224.025137
HF Energy-223.507236
Nuclear repulsion energy156.853513
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 CCD/3-21G*
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' 3258 3116 8.63      
2 A' 3222 3082 6.56      
3 A' 3085 2951 0.88      
4 A' 1578 1510 12.59      
5 A' 1531 1464 8.84      
6 A' 1490 1425 4.88      
7 A' 1316 1258 10.94      
8 A' 1307 1250 2.09      
9 A' 1278 1222 9.38      
10 A' 983 941 30.87      
11 A' 929 889 5.30      
12 A' 887 848 3.77      
13 A' 828 792 11.54      
14 A' 791 757 10.32      
15 A" 3133 2997 1.57      
16 A" 1191 1139 0.08      
17 A" 1018 974 20.73      
18 A" 947 906 0.19      
19 A" 783 749 13.26      
20 A" 567 542 18.99      
21 A" 386 370 9.18      

Unscaled Zero Point Vibrational Energy (zpe) 15253.8 cm-1
Scaled (by 0.9565) Zero Point Vibrational Energy (zpe) 14590.2 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 CCD/3-21G*
ABC
0.30335 0.27903 0.14953

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.150 0.563 0.000
C2 0.776 -0.891 0.000
N3 -0.492 -1.154 0.000
C4 -1.186 0.204 0.000
C5 0.000 1.177 0.000
H6 1.565 -1.630 0.000
H7 -1.811 0.284 0.898
H8 -1.811 0.284 -0.898
H9 -0.087 2.258 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.50042.37512.36341.30372.23183.10663.10662.0986
C21.50041.29512.24752.20881.08142.98052.98053.2649
N32.37511.29511.52592.38272.11132.14882.14883.4360
C42.36342.24751.52591.53433.30721.09691.09692.3293
C51.30372.20882.38271.53433.21432.21012.21011.0842
H62.23181.08142.11133.30723.21433.98423.98424.2248
H73.10662.98052.14881.09692.21013.98421.79592.7702
H83.10662.98052.14881.09692.21013.98421.79592.7702
H92.09863.26493.43602.32931.08424.22482.77022.7702

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 116.149 N1 C2 H6 118.744
N1 C5 C4 112.513 N1 C5 H9 122.749
C2 N1 C5 103.726 C2 N3 C4 105.345
N3 C2 H6 125.107 N3 C4 C5 102.267
N3 C4 H7 108.930 N3 C4 H8 108.930
C4 C5 H9 124.738 C5 C4 H7 113.219
C5 C4 H8 113.219 H7 C4 H8 109.886
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability