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 (4H-Imidazole)

using model chemistry: MP2/aug-cc-pVQZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/aug-cc-pVQZ
 hartrees
Energy at 0K-225.824055
Energy at 298.15K-225.829960
HF Energy-224.889075
Nuclear repulsion energy161.011082
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 MP2/aug-cc-pVQZ
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' 3256 3092 6.30      
2 A' 3235 3072 3.79      
3 A' 3083 2928 1.52      
4 A' 1604 1523 29.21      
5 A' 1520 1443 5.70      
6 A' 1403 1332 23.13      
7 A' 1323 1256 24.61      
8 A' 1305 1239 4.87      
9 A' 1257 1194 4.83      
10 A' 1051 998 51.02      
11 A' 1012 961 11.25      
12 A' 960 911 2.93      
13 A' 876 832 9.38      
14 A' 874 830 6.23      
15 A" 3134 2976 0.02      
16 A" 1163 1105 0.56      
17 A" 994 944 16.30      
18 A" 954 906 1.42      
19 A" 747 710 5.96      
20 A" 561 533 18.65      
21 A" 355 337 5.84      

Unscaled Zero Point Vibrational Energy (zpe) 15331.9 cm-1
Scaled (by 0.9497) Zero Point Vibrational Energy (zpe) 14560.7 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 MP2/aug-cc-pVQZ
ABC
0.32159 0.29489 0.15833

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/aug-cc-pVQZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.196 0.362 0.000
C2 0.000 1.135 0.000
N3 1.118 0.498 0.000
C4 0.726 -0.900 0.000
C5 -0.762 -0.855 0.000
H6 -0.067 2.212 0.000
H7 1.132 -1.404 0.879
H8 1.132 -1.404 -0.879
H9 -1.434 -1.702 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.42372.31722.29921.29152.16723.05143.05142.0774
C21.42371.28662.16112.13081.07952.91612.91613.1785
N32.31721.28661.45202.31592.08442.09572.09573.3686
C42.29922.16111.45201.48903.21251.09181.09182.3036
C51.29152.13082.31591.48903.14482.15952.15951.0809
H62.16721.07952.08443.21253.14483.91083.91084.1458
H73.05142.91612.09571.09182.15953.91081.75872.7284
H83.05142.91612.09571.09182.15953.91081.75872.7284
H92.07743.17853.36862.30361.08094.14582.72842.7284

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 117.422 N1 C2 H6 119.303
N1 C5 C4 111.363 N1 C5 H9 121.999
C2 N1 C5 103.287 C2 N3 C4 104.042
N3 C2 H6 123.275 N3 C4 C5 103.887
N3 C4 H7 110.136 N3 C4 H8 110.136
C4 C5 H9 126.638 C5 C4 H7 112.694
C5 C4 H8 112.694 H7 C4 H8 107.296
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability