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

using model chemistry: QCISD(T)/6-311G*

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)/6-311G*
 hartrees
Energy at 0K-225.634157
Energy at 298.15K-225.640034
HF Energy-224.837940
Nuclear repulsion energy159.634831
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)/6-311G*
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' 3207 3087        
2 A' 3183 3065        
3 A' 3040 2927        
4 A' 1627 1566        
5 A' 1537 1480        
6 A' 1442 1388        
7 A' 1318 1269        
8 A' 1309 1260        
9 A' 1272 1224        
10 A' 1027 989        
11 A' 1000 962        
12 A' 946 911        
13 A' 874 841        
14 A' 868 836        
15 A" 3083 2969        
16 A" 1168 1125        
17 A" 996 959        
18 A" 930 895        
19 A" 748 721        
20 A" 551 530        
21 A" 358 345        

Unscaled Zero Point Vibrational Energy (zpe) 15240.9 cm-1
Scaled (by 0.9628) Zero Point Vibrational Energy (zpe) 14673.9 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)/6-311G*
ABC
0.31751 0.28824 0.15551

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/6-311G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.212 0.359 0.000
C2 0.000 1.140 0.000
N3 1.126 0.508 0.000
C4 0.739 -0.907 0.000
C5 -0.769 -0.860 0.000
H6 -0.073 2.226 0.000
H7 1.149 -1.412 0.887
H8 1.149 -1.412 -0.887
H9 -1.444 -1.716 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.44152.34292.32541.29682.18693.08163.08162.0883
C21.44151.29172.17632.14281.08862.93582.93583.2006
N32.34291.29171.46722.33782.09542.11492.11493.3993
C42.32542.17631.46721.50893.23661.10021.10022.3281
C51.29682.14282.33781.50893.16362.18462.18461.0903
H62.18691.08862.09543.23663.16363.93883.93884.1741
H73.08162.93582.11491.10022.18463.93881.77482.7578
H83.08162.93582.11491.10022.18463.93881.77482.7578
H92.08833.20063.39932.32811.09034.17412.75782.7578

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 117.904 N1 C2 H6 118.964
N1 C5 C4 111.735 N1 C5 H9 121.817
C2 N1 C5 102.859 C2 N3 C4 103.974
N3 C2 H6 123.132 N3 C4 C5 103.529
N3 C4 H7 110.104 N3 C4 H8 110.104
C4 C5 H9 126.449 C5 C4 H7 112.776
C5 C4 H8 112.776 H7 C4 H8 107.529
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability