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 C3H3 (cyclopropenyl radical)

using model chemistry: MP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 2 yes CS 2A'

Conformer 1 (D3H)

Jump to S1C2
Vibrational Frequencies calculated at MP2/3-21G*
Rotational Constants (cm-1) from geometry optimized at MP2/3-21G*
See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G*
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (CS)

Jump to S1C1
Energy calculated at MP2/3-21G*
 hartrees
Energy at 0K-114.775646
Energy at 298.15K-114.777416
HF Energy-114.526109
Nuclear repulsion energy56.996290
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 MP2/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3362 3198 0.57      
2 A' 3171 3017 37.93      
3 A' 1569 1492 0.15      
4 A' 1181 1124 15.06      
5 A' 1054 1003 5.82      
6 A' 957 910 2.83      
7 A' 629 598 96.03      
8 A" 5836 5552 206923.90      
9 A" 3093 2942 3440.40      
10 A" 1086 1034 7.33      
11 A" 1030 979 12.82      
12 A" 870 828 0.18      

Unscaled Zero Point Vibrational Energy (zpe) 11918.4 cm-1
Scaled (by 0.9513) Zero Point Vibrational Energy (zpe) 11338.0 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 MP2/3-21G*
ABC
1.04336 0.84289 0.48037

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.038 0.919 0.000
H2 0.761 1.656 0.000
C3 -0.038 -0.431 0.666
C4 -0.038 -0.431 -0.666
H5 -0.040 -1.002 1.573
H6 -0.040 -1.002 -1.573

Atom - Atom Distances (Å)
  C1 H2 C3 C4 H5 H6
C11.08661.50501.50502.48322.4832
H21.08662.33152.33153.19113.1911
C31.50502.33151.33141.07262.3108
C41.50502.33151.33142.31081.0726
H52.48323.19111.07262.31083.1469
H62.48323.19112.31081.07263.1469

picture of cyclopropenyl radical state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C3 C4 63.749 C1 C3 H5 148.434
C1 C4 C3 63.749 C1 C4 H6 148.434
H2 C1 C3 127.475 H2 C1 C4 127.475
C3 C1 C4 52.502 C3 C4 H6 147.816
C4 C3 H5 147.816
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability