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 (4H-Imidazole)

using model chemistry: QCISD(T)/aug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at QCISD(T)/aug-cc-pVDZ
 hartrees
Energy at 0K-225.635424
Energy at 298.15K 
HF Energy-224.823981
Nuclear repulsion energy158.723752
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)/aug-cc-pVDZ
Rotational Constants (cm-1) from geometry optimized at QCISD(T)/aug-cc-pVDZ
ABC
0.31297 0.28592 0.15381

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.215 0.364 0.000
C2 0.000 1.150 0.000
N3 1.133 0.508 0.000
C4 0.740 -0.914 0.000
C5 -0.773 -0.865 0.000
H6 -0.070 2.242 0.000
H7 1.150 -1.422 0.894
H8 1.150 -1.422 -0.894
H9 -1.452 -1.726 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.44712.35272.33631.30662.19933.09613.09612.1034
C21.44711.30192.19242.15821.09412.95572.95573.2214
N32.35271.30191.47532.34942.10982.12732.12733.4166
C42.33632.19241.47531.51433.25781.10681.10682.3380
C51.30662.15822.34941.51433.18552.19282.19281.0962
H62.19931.09412.10983.25783.18553.96363.96364.2014
H73.09612.95572.12731.10682.19283.96361.78752.7682
H83.09612.95572.12731.10682.19283.96361.78752.7682
H92.10343.22143.41662.33801.09624.20142.76822.7682

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 117.604 N1 C2 H6 119.217
N1 C5 C4 111.624 N1 C5 H9 121.948
C2 N1 C5 103.091 C2 N3 C4 104.090
N3 C2 H6 123.179 N3 C4 C5 103.591
N3 C4 H7 110.129 N3 C4 H8 110.129
C4 C5 H9 126.428 C5 C4 H7 112.633
C5 C4 H8 112.633 H7 C4 H8 107.700
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability