return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C3H4N2 (2H-Imidazole)

using model chemistry: CCD/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CCD/6-31G**
 hartrees
Energy at 0K-225.471230
Energy at 298.15K-225.477257
HF Energy-224.731087
Nuclear repulsion energy166.570938
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/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 A1 3325 3117 11.64      
2 A1 3154 2957 0.97      
3 A1 1773 1663 23.25      
4 A1 1495 1402 3.67      
5 A1 1449 1358 10.57      
6 A1 1293 1213 2.94      
7 A1 1069 1002 1.29      
8 A1 960 900 13.95      
9 A2 1184 1110 0.00      
10 A2 898 842 0.00      
11 A2 541 507 0.00      
12 B1 3207 3007 0.59      
13 B1 1050 985 21.33      
14 B1 833 781 5.00      
15 B1 353 331 37.82      
16 B2 3309 3103 8.58      
17 B2 1834 1720 0.13      
18 B2 1461 1370 33.97      
19 B2 1289 1209 1.51      
20 B2 1113 1044 31.03      
21 B2 952 893 62.16      

Unscaled Zero Point Vibrational Energy (zpe) 16271.0 cm-1
Scaled (by 0.9376) Zero Point Vibrational Energy (zpe) 15255.7 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/6-31G**
ABC
0.36240 0.30280 0.17033

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.207
N2 0.000 0.997 0.281
N3 0.000 -0.997 0.281
C4 0.000 0.727 -0.948
C5 0.000 -0.727 -0.948
H6 -0.893 0.000 1.831
H7 0.893 0.000 1.831
H8 0.000 1.469 -1.731
H9 0.000 -1.469 -1.731

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8 H9
C11.36131.36132.27482.27481.08961.08963.28503.2850
N21.36131.99461.25802.11772.04862.04862.06613.1829
N31.36131.99462.11771.25802.04862.04863.18292.0661
C42.27481.25802.11771.45493.00863.00861.07862.3322
C52.27482.11771.25801.45493.00863.00862.33221.0786
H61.08962.04862.04863.00863.00861.78663.95543.9554
H71.08962.04862.04863.00863.00861.78663.95543.9554
H83.28502.06613.18291.07862.33223.95543.95542.9389
H93.28503.18292.06612.33221.07863.95543.95542.9389

picture of 2H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C4 120.508 C1 N3 C5 120.508
N2 C1 N3 94.211 N2 C1 H6 112.941
N2 C1 H7 112.941 N2 C4 C5 102.387
N2 C4 H8 124.143 N3 C1 H6 112.941
N3 C1 H7 112.941 N3 C5 C4 102.387
N3 C5 H9 124.143 C4 C5 H9 133.471
C5 C4 H8 133.471 H6 C1 H7 110.129
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability