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: QCISD(T)=FULL/cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at QCISD(T)=FULL/cc-pVDZ
 hartrees
Energy at 0K-225.521189
Energy at 298.15K-225.527136
HF Energy-224.739207
Nuclear repulsion energy165.475438
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 QCISD(T)=FULL/cc-pVDZ
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 3252 3119        
2 A1 3096 2969        
3 A1 1710 1640        
4 A1 1431 1372        
5 A1 1394 1337        
6 A1 1269 1217        
7 A1 1032 989        
8 A1 920 883        
9 A2 1148 1101        
10 A2 875 839        
11 A2 519 498        
12 B1 3152 3023        
13 B1 1010 968        
14 B1 810 777        
15 B1 337 323        
16 B2 3236 3104        
17 B2 1763 1691        
18 B2 1412 1354        
19 B2 1236 1185        
20 B2 1085 1041        
21 B2 928 890        

Unscaled Zero Point Vibrational Energy (zpe) 15807.4 cm-1
Scaled (by 0.959) Zero Point Vibrational Energy (zpe) 15159.3 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 QCISD(T)=FULL/cc-pVDZ
ABC
0.35885 0.29808 0.16818

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)=FULL/cc-pVDZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.214
N2 0.000 0.998 0.285
N3 0.000 -0.998 0.285
C4 0.000 0.734 -0.957
C5 0.000 -0.734 -0.957
H6 -0.904 0.000 1.846
H7 0.904 0.000 1.846
H8 0.000 1.498 -1.740
H9 0.000 -1.498 -1.740

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8 H9
C11.36371.36372.29202.29201.10271.10273.31223.3122
N21.36371.99511.26902.13082.06172.06172.08533.2131
N31.36371.99512.13081.26902.06172.06173.21312.0853
C42.29201.26902.13081.46863.03533.03531.09362.3653
C52.29202.13081.26901.46863.03533.03532.36531.0936
H61.10272.06172.06173.03533.03531.80743.99003.9900
H71.10272.06172.06173.03533.03531.80743.99003.9900
H83.31222.08533.21311.09362.36533.99003.99002.9952
H93.31223.21312.08532.36531.09363.99003.99002.9952

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 121.016 C1 N3 C5 121.016
N2 C1 N3 94.023 N2 C1 H6 112.999
N2 C1 H7 112.999 N2 C4 C5 101.972
N2 C4 H8 123.761 N3 C1 H6 112.999
N3 C1 H7 112.999 N3 C5 C4 101.972
N3 C5 H9 123.761 C4 C5 H9 134.267
C5 C4 H8 134.267 H6 C1 H7 110.079
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability