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)/TZVP

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)/TZVP
 hartrees
Energy at 0K-225.604638
Energy at 298.15K-225.610517
HF Energy-224.792935
Nuclear repulsion energy166.333847
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)/TZVP
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 3259 3139        
2 A1 3091 2977        
3 A1 1687 1625        
4 A1 1443 1389        
5 A1 1403 1351        
6 A1 1256 1209        
7 A1 1033 995        
8 A1 926 892        
9 A2 1151 1109        
10 A2 797 767        
11 A2 503 485        
12 B1 3140 3024        
13 B1 1026 988        
14 B1 793 764        
15 B1 307 295        
16 B2 3245 3125        
17 B2 1745 1681        
18 B2 1407 1355        
19 B2 1264 1217        
20 B2 1088 1048        
21 B2 927 893        

Unscaled Zero Point Vibrational Energy (zpe) 15744.4 cm-1
Scaled (by 0.9632) Zero Point Vibrational Energy (zpe) 15165.0 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 QCISD(T)/TZVP
ABC
0.36166 0.30176 0.16989

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.209
N2 0.000 0.997 0.282
N3 0.000 -0.997 0.282
C4 0.000 0.729 -0.950
C5 0.000 -0.729 -0.950
H6 -0.898 0.000 1.831
H7 0.898 0.000 1.831
H8 0.000 1.476 -1.731
H9 0.000 -1.476 -1.731

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8 H9
C11.36171.36172.27902.27901.09231.09233.28983.2898
N21.36171.99471.26122.12062.04932.04932.06913.1889
N31.36171.99472.12061.26122.04932.04933.18892.0691
C42.27901.26122.12061.45703.01183.01181.08082.3385
C52.27902.12061.26121.45703.01183.01182.33851.0808
H61.09232.04932.04933.01183.01181.79653.95863.9586
H71.09232.04932.04933.01183.01181.79653.95863.9586
H83.28982.06913.18891.08082.33853.95863.95862.9517
H93.28983.18892.06912.33851.08083.95863.95862.9517

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 120.605 C1 N3 C5 120.605
N2 C1 N3 94.176 N2 C1 H6 112.792
N2 C1 H7 112.792 N2 C4 C5 102.307
N2 C4 H8 123.947 N3 C1 H6 112.792
N3 C1 H7 112.792 N3 C5 C4 102.307
N3 C5 H9 123.947 C4 C5 H9 133.746
C5 C4 H8 133.746 H6 C1 H7 110.645
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability