return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C3H4N2 (2H-Imidazole)

using model chemistry: CISD/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CISD/6-311G*
 hartrees
Energy at 0K-225.402666
Energy at 298.15K-225.408784
HF Energy-224.771152
Nuclear repulsion energy167.407318
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 CISD/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 A1 3344 3094 14.27      
2 A1 3190 2952 0.97      
3 A1 1813 1678 25.59      
4 A1 1511 1398 5.42      
5 A1 1465 1356 17.76      
6 A1 1302 1205 3.59      
7 A1 1081 1000 1.44      
8 A1 980 907 15.38      
9 A2 1215 1125 0.00      
10 A2 957 886 0.00      
11 A2 564 522 0.00      
12 B1 3239 2997 0.48      
13 B1 1077 996 24.95      
14 B1 869 804 7.44      
15 B1 375 347 37.94      
16 B2 3328 3079 6.56      
17 B2 1878 1738 0.05      
18 B2 1484 1374 39.96      
19 B2 1306 1209 2.65      
20 B2 1132 1047 39.33      
21 B2 971 899 67.97      

Unscaled Zero Point Vibrational Energy (zpe) 16540.6 cm-1
Scaled (by 0.9253) Zero Point Vibrational Energy (zpe) 15305.0 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 CISD/6-311G*
ABC
0.36287 0.30798 0.17204

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.197
N2 0.000 0.997 0.277
N3 0.000 -0.997 0.277
C4 0.000 0.727 -0.938
C5 0.000 -0.727 -0.938
H6 -0.892 0.000 1.819
H7 0.892 0.000 1.819
H8 0.000 1.467 -1.722
H9 0.000 -1.467 -1.722

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8 H9
C11.35661.35662.25612.25611.08711.08713.26683.2668
N21.35661.99361.24512.10942.04122.04122.05333.1723
N31.35661.99362.10941.24512.04122.04123.17232.0533
C42.25611.24512.10941.45432.98792.98791.07722.3294
C52.25612.10941.24511.45432.98792.98792.32941.0772
H61.08712.04122.04122.98792.98791.78353.93493.9349
H71.08712.04122.04122.98792.98791.78353.93493.9349
H83.26682.05333.17231.07722.32943.93493.93492.9331
H93.26683.17232.05332.32941.07723.93493.93492.9331

picture of 2H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C4 120.204 C1 N3 C5 120.204
N2 C1 N3 94.576 N2 C1 H6 112.827
N2 C1 H7 112.827 N2 C4 C5 102.508
N2 C4 H8 124.146 N3 C1 H6 112.827
N3 C1 H7 112.827 N3 C5 C4 102.508
N3 C5 H9 124.146 C4 C5 H9 133.346
C5 C4 H8 133.346 H6 C1 H7 110.228
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability