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 C3H3N2 (imidazolyl radical)

using model chemistry: CCSD(T)/cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 2B1
Energy calculated at CCSD(T)/cc-pVDZ
 hartrees
Energy at 0K-224.958250
Energy at 298.15K-224.962651
HF Energy-224.218468
Nuclear repulsion energy151.549882
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 CCSD(T)/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 3253 3184        
2 A1 3240 3171        
3 A1 1467 1436        
4 A1 1308 1280        
5 A1 1149 1124        
6 A1 988 967        
7 A1 904 884        
8 A2 863 845        
9 A2 554 543        
10 B1 852 834        
11 B1 764 748        
12 B1 517 506        
13 B2 3226 3158        
14 B2 1538 1506        
15 B2 1284 1257        
16 B2 1182 1157        
17 B2 995 974        
18 B2 766 750        

Unscaled Zero Point Vibrational Energy (zpe) 12424.9 cm-1
Scaled (by 0.9788) Zero Point Vibrational Energy (zpe) 12161.5 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 CCSD(T)/cc-pVDZ
ABC
0.35080 0.29862 0.16131

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.101
N2 0.000 1.182 0.375
N3 0.000 -1.182 0.375
C4 0.000 0.743 -0.880
C5 0.000 -0.743 -0.880
H6 0.000 0.000 2.195
H7 0.000 1.417 -1.744
H8 0.000 -1.417 -1.744

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8
C11.38721.38722.11602.11601.09443.17853.1785
N21.38722.36481.33032.29882.17032.13263.3540
N31.38722.36482.29881.33032.17033.35402.1326
C42.11601.33032.29881.48623.16411.09572.3264
C52.11602.29881.33031.48623.16412.32641.0957
H61.09442.17032.17033.16413.16414.18674.1867
H73.17852.13263.35401.09572.32644.18672.8338
H83.17853.35402.13262.32641.09574.18672.8338

picture of imidazolyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C4 102.253 C1 N3 C5 102.253
N2 C1 N3 116.932 N2 C1 H6 121.534
N2 C4 C5 109.282 N2 C4 H7 122.768
N3 C1 H6 121.534 N3 C5 C4 109.282
N3 C5 H8 122.768 C4 C5 H8 127.950
C5 C4 H7 127.950
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability