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)/aug-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)/aug-cc-pVDZ
 hartrees
Energy at 0K-224.999425
Energy at 298.15K-225.003798
HF Energy-224.230284
Nuclear repulsion energy151.330886
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)/aug-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 3243 3122        
2 A1 3235 3114        
3 A1 1440 1386        
4 A1 1298 1249        
5 A1 1140 1097        
6 A1 985 948        
7 A1 895 862        
8 A2 841 810        
9 A2 534 514        
10 B1 849 817        
11 B1 758 730        
12 B1 514 495        
13 B2 3221 3101        
14 B2 1512 1455        
15 B2 1276 1228        
16 B2 1171 1128        
17 B2 989 952        
18 B2 760 731        

Unscaled Zero Point Vibrational Energy (zpe) 12330.4 cm-1
Scaled (by 0.9625) Zero Point Vibrational Energy (zpe) 11868.0 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 CCSD(T)/aug-cc-pVDZ
ABC
0.34798 0.29917 0.16087

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.107
N2 0.000 1.181 0.376
N3 0.000 -1.181 0.376
C4 0.000 0.743 -0.885
C5 0.000 -0.743 -0.885
H6 0.000 0.000 2.200
H7 0.000 1.417 -1.746
H8 0.000 -1.417 -1.746

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8
C11.38901.38902.12602.12601.09253.18573.1857
N21.38902.36151.33422.29992.17292.13463.3543
N31.38902.36152.29991.33422.17293.35432.1346
C42.12601.33422.29991.48623.17271.09372.3258
C52.12602.29991.33421.48623.17272.32581.0937
H61.09252.17292.17293.17273.17274.19244.1924
H73.18572.13463.35431.09372.32584.19242.8349
H83.18573.35432.13462.32581.09374.19242.8349

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 102.630 C1 N3 C5 102.630
N2 C1 N3 116.438 N2 C1 H6 121.781
N2 C4 C5 109.151 N2 C4 H7 122.782
N3 C1 H6 121.781 N3 C5 C4 109.151
N3 C5 H8 122.782 C4 C5 H8 128.067
C5 C4 H7 128.067
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability