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

using model chemistry: G2

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at G2
 hartrees
Energy at 0K-225.807323
Energy at 298.15K-225.802510
HF Energy-224.797819
Nuclear repulsion energy162.324284
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 HF/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' 3425 3227 20.89      
2 A' 3396 3200 14.93      
3 A' 3227 3040 8.52      
4 A' 1877 1768 76.90      
5 A' 1775 1673 34.10      
6 A' 1581 1490 6.72      
7 A' 1466 1381 35.37      
8 A' 1450 1366 18.64      
9 A' 1406 1325 4.23      
10 A' 1135 1069 81.81      
11 A' 1098 1034 16.91      
12 A' 1012 954 1.60      
13 A' 961 905 2.63      
14 A' 945 890 14.54      
15 A" 3264 3075 9.61      
16 A" 1293 1218 0.26      
17 A" 1138 1072 12.16      
18 A" 1090 1027 1.24      
19 A" 851 801 1.91      
20 A" 611 576 34.84      
21 A" 404 380 5.12      

Unscaled Zero Point Vibrational Energy (zpe) 16701.3 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 15735.9 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 MP2=FULL/6-31G*
ABC
0.31963 0.29165 0.15696

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.204 0.365 0.000
C2 0.000 1.136 0.000
N3 1.125 0.499 0.000
C4 0.729 -0.904 0.000
C5 -0.765 -0.856 0.000
H6 -0.068 2.219 0.000
H7 1.139 -1.409 0.883
H8 1.139 -1.409 -0.883
H9 -1.437 -1.709 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.42992.33272.31201.29752.17483.06883.06882.0873
C21.42991.29272.16682.13421.08512.92532.92533.1881
N32.33271.29271.45862.32582.09292.10322.10323.3829
C42.31202.16681.45861.49443.22351.09711.09712.3107
C51.29752.13422.32581.49443.15352.17062.17061.0863
H62.17481.08512.09293.22353.15353.92463.92464.1605
H73.06882.92532.10321.09712.17063.92461.76652.7401
H83.06882.92532.10321.09712.17063.92461.76652.7401
H92.08733.18813.38292.31071.08634.16052.74012.7401

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 117.345 N1 C2 H6 118.950
N1 C5 C4 111.447 N1 C5 H9 122.602
C2 N1 C5 103.679 C2 N3 C4 104.967
N3 C2 H6 123.705 N3 C4 C5 102.562
N3 C4 H7 110.929 N3 C4 H8 110.929
C4 C5 H9 125.950 C5 C4 H7 112.447
C5 C4 H8 112.447 H7 C4 H8 107.548
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability