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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-225.585600
Energy at 298.15K-225.591502
HF Energy-224.800258
Nuclear repulsion energy159.758177
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' 3278 3109        
2 A' 3259 3091        
3 A' 3103 2943        
4 A' 1651 1566        
5 A' 1562 1482        
6 A' 1468 1392        
7 A' 1345 1276        
8 A' 1329 1261        
9 A' 1294 1227        
10 A' 1038 985        
11 A' 1003 951        
12 A' 957 908        
13 A' 877 832        
14 A' 872 827        
15 A" 3151 2989        
16 A" 1176 1116        
17 A" 1012 960        
18 A" 943 894        
19 A" 763 724        
20 A" 553 525        
21 A" 362 343        

Unscaled Zero Point Vibrational Energy (zpe) 15497.3 cm-1
Scaled (by 0.9485) Zero Point Vibrational Energy (zpe) 14699.2 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
0.31751 0.28903 0.15569

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 -1.210 0.362 0.000
C2 0.000 1.141 0.000
N3 1.127 0.506 0.000
C4 0.736 -0.908 0.000
C5 -0.769 -0.859 0.000
H6 -0.071 2.221 0.000
H7 1.141 -1.413 0.883
H8 1.141 -1.413 -0.883
H9 -1.434 -1.714 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.43942.34232.32441.29822.18043.07573.07572.0879
C21.43941.29362.17722.14231.08232.93302.93303.1947
N32.34231.29361.46782.33672.09142.11252.11253.3900
C42.32442.17721.46781.50593.23131.09451.09452.3152
C51.29822.14232.33671.50593.15772.17612.17611.0834
H62.18041.08232.09143.23133.15773.93073.93074.1642
H73.07572.93302.11251.09452.17613.93071.76542.7394
H83.07572.93302.11251.09452.17613.93071.76542.7394
H92.08793.19473.39002.31521.08344.16422.73942.7394

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 117.881 N1 C2 H6 119.016
N1 C5 C4 111.763 N1 C5 H9 122.227
C2 N1 C5 102.872 C2 N3 C4 103.903
N3 C2 H6 123.103 N3 C4 C5 103.581
N3 C4 H7 110.219 N3 C4 H8 110.219
C4 C5 H9 126.010 C5 C4 H7 112.653
C5 C4 H8 112.653 H7 C4 H8 107.508
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability