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

using model chemistry: QCISD(T)=FULL/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 QCISD(T)=FULL/6-31G*
 hartrees
Energy at 0K-225.575147
Energy at 298.15K-225.581041
HF Energy-224.793259
Nuclear repulsion energy159.743160
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 QCISD(T)=FULL/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' 3235 3235        
2 A' 3214 3214        
3 A' 3061 3061        
4 A' 1648 1648        
5 A' 1560 1560        
6 A' 1464 1464        
7 A' 1338 1338        
8 A' 1326 1326        
9 A' 1290 1290        
10 A' 1038 1038        
11 A' 1004 1004        
12 A' 960 960        
13 A' 879 879        
14 A' 874 874        
15 A" 3105 3105        
16 A" 1176 1176        
17 A" 1010 1010        
18 A" 938 938        
19 A" 761 761        
20 A" 556 556        
21 A" 366 366        

Unscaled Zero Point Vibrational Energy (zpe) 15401.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 15401.4 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 QCISD(T)=FULL/6-31G*
ABC
0.31731 0.28937 0.15578

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)=FULL/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.209 0.362 0.000
C2 0.000 1.141 0.000
N3 1.126 0.505 0.000
C4 0.735 -0.908 0.000
C5 -0.768 -0.858 0.000
H6 -0.071 2.227 0.000
H7 1.145 -1.415 0.887
H8 1.145 -1.415 -0.887
H9 -1.440 -1.716 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.43832.33992.32251.29792.18493.08023.08022.0912
C21.43831.29302.17652.14161.08842.93732.93733.1994
N32.33991.29301.46632.33412.09662.11482.11483.3943
C42.32252.17651.46631.50403.23661.10051.10052.3206
C51.29792.14162.33411.50403.16312.18102.18101.0897
H62.18491.08842.09663.23663.16313.94013.94014.1741
H73.08022.93732.11481.10052.18103.94011.77322.7499
H83.08022.93732.11481.10052.18103.94011.77322.7499
H92.09123.19943.39432.32061.08974.17412.74992.7499

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 117.795 N1 C2 H6 119.056
N1 C5 C4 111.760 N1 C5 H9 122.052
C2 N1 C5 102.898 C2 N3 C4 103.966
N3 C2 H6 123.150 N3 C4 C5 103.581
N3 C4 H7 110.140 N3 C4 H8 110.140
C4 C5 H9 126.188 C5 C4 H7 112.815
C5 C4 H8 112.815 H7 C4 H8 107.342
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability