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: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 2B1
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-225.003684
Energy at 298.15K 
HF Energy-224.222768
Nuclear repulsion energy154.352688
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 MP2/6-31G(2df,p)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 3303 3119 2.53      
2 A1 3294 3111 14.68      
3 A1 1477 1395 58.78      
4 A1 1407 1328 60.94      
5 A1 1237 1168 62.91      
6 A1 1077 1017 18.44      
7 A1 940 888 2.03      
8 A2 1041 983 0.00      
9 A2 614 580 0.00      
10 B1 998 943 2.96      
11 B1 908 857 7.98      
12 B1 537 507 38.80      
13 B2 3277 3095 0.24      
14 B2 1670 1578 54.57      
15 B2 1313 1240 0.21      
16 B2 1225 1157 36.33      
17 B2 993 938 50.13      
18 B2 265i 250i 0.23      

Unscaled Zero Point Vibrational Energy (zpe) 12522.5 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 11827.5 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 MP2/6-31G(2df,p)
ABC
0.36269 0.31152 0.16758

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.080
N2 0.000 1.164 0.370
N3 0.000 -1.164 0.370
C4 0.000 0.717 -0.865
C5 0.000 -0.717 -0.865
H6 0.000 0.000 2.162
H7 0.000 1.378 -1.722
H8 0.000 -1.378 -1.722

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8
C11.36331.36332.07362.07361.08143.12293.1229
N21.36332.32771.31392.25082.13622.10353.2923
N31.36332.32772.25081.31392.13623.29232.1035
C42.07361.31392.25081.43473.11091.08192.2637
C52.07362.25081.31391.43473.11092.26371.0819
H61.08142.13622.13623.11093.11094.12114.1211
H73.12292.10353.29231.08192.26374.12112.7558
H83.12293.29232.10352.26371.08194.12112.7558

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 101.515 C1 N3 C5 101.515
N2 C1 N3 117.237 N2 C1 H6 121.382
N2 C4 C5 109.866 N2 C4 H7 122.507
N3 C1 H6 121.382 N3 C5 C4 109.866
N3 C5 H8 122.507 C4 C5 H8 127.627
C5 C4 H7 127.627
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability