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

using model chemistry: CCSD(T)/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 CCSD(T)/6-31G*
 hartrees
Energy at 0K-225.553378
Energy at 298.15K-225.559266
HF Energy-224.792957
Nuclear repulsion energy159.616823
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 CCSD(T)/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' 3236 3113        
2 A' 3214 3092        
3 A' 3062 2946        
4 A' 1647 1585        
5 A' 1559 1500        
6 A' 1465 1409        
7 A' 1337 1286        
8 A' 1325 1275        
9 A' 1290 1241        
10 A' 1037 998        
11 A' 1003 965        
12 A' 960 923        
13 A' 878 845        
14 A' 873 840        
15 A" 3105 2987        
16 A" 1174 1129        
17 A" 1009 971        
18 A" 934 899        
19 A" 760 731        
20 A" 554 533        
21 A" 365 352        

Unscaled Zero Point Vibrational Energy (zpe) 15392.3 cm-1
Scaled (by 0.9621) Zero Point Vibrational Energy (zpe) 14808.9 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 CCSD(T)/6-31G*
ABC
0.31685 0.28883 0.15552

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.211 0.362 0.000
C2 0.000 1.142 0.000
N3 1.127 0.506 0.000
C4 0.736 -0.909 0.000
C5 -0.769 -0.859 0.000
H6 -0.071 2.228 0.000
H7 1.146 -1.415 0.887
H8 1.146 -1.415 -0.887
H9 -1.441 -1.717 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.43972.34222.32471.29882.18623.08243.08242.0921
C21.43971.29402.17832.14311.08852.93912.93913.2011
N32.34221.29401.46792.33622.09742.11632.11633.3965
C42.32472.17831.46791.50543.23851.10071.10072.3219
C51.29882.14312.33621.50543.16472.18242.18241.0899
H62.18621.08852.09743.23853.16473.94203.94204.1760
H73.08242.93912.11631.10072.18243.94201.77382.7512
H83.08242.93912.11631.10072.18243.94201.77382.7512
H92.09213.20113.39652.32191.08994.17602.75122.7512

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 117.818 N1 C2 H6 119.048
N1 C5 C4 111.784 N1 C5 H9 122.041
C2 N1 C5 102.877 C2 N3 C4 103.953
N3 C2 H6 123.134 N3 C4 C5 103.568
N3 C4 H7 110.140 N3 C4 H8 110.140
C4 C5 H9 126.175 C5 C4 H7 112.809
C5 C4 H8 112.809 H7 C4 H8 107.366
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability