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

using model chemistry: CCSD(T)/cc-pVTZ

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)/cc-pVTZ
 hartrees
Energy at 0K-225.808156
Energy at 298.15K-225.814076
HF Energy-224.872204
Nuclear repulsion energy160.280905
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)/cc-pVTZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3228 3147        
2 A' 3205 3125        
3 A' 3056 2979        
4 A' 1630 1589        
5 A' 1539 1500        
6 A' 1419 1383        
7 A' 1323 1289        
8 A' 1308 1275        
9 A' 1267 1236        
10 A' 1031 1005        
11 A' 997 971        
12 A' 945 922        
13 A' 875 853        
14 A' 871 849        
15 A" 3097 3019        
16 A" 1168 1138        
17 A" 1003 978        
18 A" 958 934        
19 A" 757 738        
20 A" 555 541        
21 A" 369 359        

Unscaled Zero Point Vibrational Energy (zpe) 15300.2 cm-1
Scaled (by 0.9748) Zero Point Vibrational Energy (zpe) 14914.6 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)/cc-pVTZ
ABC
0.31939 0.29113 0.15675

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.205 0.358 0.000
C2 0.000 1.138 0.000
N3 1.122 0.507 0.000
C4 0.735 -0.905 0.000
C5 -0.766 -0.857 0.000
H6 -0.073 2.217 0.000
H7 1.138 -1.410 0.882
H8 1.138 -1.410 -0.882
H9 -1.433 -1.710 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.43542.33202.31491.29202.17643.06583.06582.0805
C21.43541.28732.17042.13641.08142.92662.92663.1878
N32.33201.28731.46332.32862.08602.10992.10993.3824
C42.31492.17041.46331.50143.22391.09401.09402.3128
C51.29202.13642.32861.50143.15062.17052.17051.0830
H62.17641.08142.08603.22393.15063.92403.92404.1554
H73.06582.92662.10991.09402.17053.92401.76452.7354
H83.06582.92662.10991.09402.17053.92401.76452.7354
H92.08053.18783.38242.31281.08304.15542.73542.7354

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 117.751 N1 C2 H6 119.036
N1 C5 C4 111.712 N1 C5 H9 122.070
C2 N1 C5 103.002 C2 N3 C4 104.019
N3 C2 H6 123.213 N3 C4 C5 103.515
N3 C4 H7 110.358 N3 C4 H8 110.358
C4 C5 H9 126.218 C5 C4 H7 112.556
C5 C4 H8 112.556 H7 C4 H8 107.502
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability