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/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-225.691881
Energy at 298.15K-225.697932
HF Energy-224.804719
Nuclear repulsion energy166.869364
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/cc-pVTZ
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 3263 3118 11.25      
2 A1 3106 2968 0.63      
3 A1 1739 1662 26.01      
4 A1 1450 1386 3.52      
5 A1 1417 1354 16.68      
6 A1 1266 1210 2.74      
7 A1 1044 998 1.38      
8 A1 942 900 15.22      
9 A2 1177 1125 0.00      
10 A2 937 895 0.00      
11 A2 548 524 0.00      
12 B1 3151 3011 0.01      
13 B1 1037 991 22.80      
14 B1 840 803 5.85      
15 B1 362 346 34.13      
16 B2 3249 3104 4.71      
17 B2 1796 1716 0.01      
18 B2 1426 1363 35.33      
19 B2 1268 1211 2.66      
20 B2 1096 1047 34.59      
21 B2 942 900 63.60      

Unscaled Zero Point Vibrational Energy (zpe) 16028.4 cm-1
Scaled (by 0.9555) Zero Point Vibrational Energy (zpe) 15315.1 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/cc-pVTZ
ABC
0.36210 0.30492 0.17092

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.203
N2 0.000 0.997 0.279
N3 0.000 -0.997 0.279
C4 0.000 0.729 -0.944
C5 0.000 -0.729 -0.944
H6 -0.893 0.000 1.826
H7 0.893 0.000 1.826
H8 0.000 1.471 -1.726
H9 0.000 -1.471 -1.726

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8 H9
C11.35911.35912.26752.26751.08891.08893.27763.2776
N21.35911.99411.25282.11562.04542.04542.06053.1803
N31.35911.99412.11561.25282.04542.04543.18032.0605
C42.26751.25282.11561.45733.00063.00061.07822.3348
C52.26752.11561.25281.45733.00063.00062.33481.0782
H61.08892.04542.04543.00063.00061.78583.94703.9470
H71.08892.04542.04543.00063.00061.78583.94703.9470
H83.27762.06053.18031.07822.33483.94703.94702.9430
H93.27763.18032.06052.33481.07823.94703.94702.9430

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 120.435 C1 N3 C5 120.435
N2 C1 N3 94.386 N2 C1 H6 112.887
N2 C1 H7 112.887 N2 C4 C5 102.372
N2 C4 H8 124.077 N3 C1 H6 112.887
N3 C1 H7 112.887 N3 C5 C4 102.372
N3 C5 H9 124.077 C4 C5 H9 133.551
C5 C4 H8 133.551 H6 C1 H7 110.174
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability