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/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/cc-pVDZ
 hartrees
Energy at 0K-224.928236
Energy at 298.15K-224.932695
HF Energy-224.219771
Nuclear repulsion energy152.029886
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/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 3275 3102 2.53      
2 A1 3263 3091 9.86      
3 A1 1499 1420 16.30      
4 A1 1324 1254 44.39      
5 A1 1164 1102 26.37      
6 A1 1002 949 2.05      
7 A1 918 870 4.05      
8 A2 884 838 0.00      
9 A2 569 539 0.00      
10 B1 865 819 0.70      
11 B1 777 736 20.96      
12 B1 532 504 28.82      
13 B2 3249 3078 1.18      
14 B2 1561 1478 17.63      
15 B2 1299 1230 0.00      
16 B2 1192 1129 5.91      
17 B2 1013 960 56.40      
18 B2 790 748 0.07      

Unscaled Zero Point Vibrational Energy (zpe) 12586.9 cm-1
Scaled (by 0.9473) Zero Point Vibrational Energy (zpe) 11923.6 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/cc-pVDZ
ABC
0.35263 0.30077 0.16232

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.099
N2 0.000 1.177 0.373
N3 0.000 -1.177 0.373
C4 0.000 0.743 -0.878
C5 0.000 -0.743 -0.878
H6 0.000 0.000 2.192
H7 0.000 1.415 -1.740
H8 0.000 -1.415 -1.740

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8
C11.38251.38252.11152.11151.09253.17243.1724
N21.38252.35351.32412.29102.16582.12713.3442
N31.38252.35352.29101.32412.16583.34422.1271
C42.11151.32412.29101.48513.15771.09382.3235
C52.11152.29101.32411.48513.15772.32351.0938
H61.09252.16582.16583.15773.15774.17884.1788
H73.17242.12713.34421.09382.32354.17882.8295
H83.17243.34422.12712.32351.09384.17882.8295

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 102.522 C1 N3 C5 102.522
N2 C1 N3 116.674 N2 C1 H6 121.663
N2 C4 C5 109.141 N2 C4 H7 122.938
N3 C1 H6 121.663 N3 C5 C4 109.141
N3 C5 H8 122.938 C4 C5 H8 127.921
C5 C4 H7 127.921
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability