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 C5H5 (cyclopentadienyl radical)

using model chemistry: MP3/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 2 yes C2V 2B1

Conformer 1 (D5H)

Jump to S1C2
Vibrational Frequencies calculated at MP3/6-31G*
Rotational Constants (cm-1) from geometry optimized at MP3/6-31G*
See section I.F.4 to change rotational constant units
Geometric Data calculated at MP3/6-31G*
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C2V)

Jump to S1C1
Energy calculated at MP3/6-31G*
 hartrees
Energy at 0K-192.823100
Energy at 298.15K-192.827936
HF Energy-192.191725
Nuclear repulsion energy148.960728
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 MP3/6-31G*
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 3313 3110 0.43      
2 A1 3303 3100 8.84      
3 A1 3275 3074 1.25      
4 A1 1634 1533 0.00      
5 A1 1526 1432 2.01      
6 A1 1191 1118 0.75      
7 A1 1129 1060 10.74      
8 A1 1076 1010 7.74      
9 A1 867 814 0.29      
10 A2 854 802 0.00      
11 A2 831 780 0.00      
12 A2 526 494 0.00      
13 B1 878 824 7.69      
14 B1 734 689 20.07      
15 B1 688 646 81.94      
16 B1 506 475 10.65      
17 B2 5833 5475 64266.06      
18 B2 3283 3082 80.29      
19 B2 3275 3074 28.19      
20 B2 1419 1332 83.70      
21 B2 1337 1255 0.04      
22 B2 1196 1123 11.77      
23 B2 982 922 2.25      
24 B2 877 823 9.16      

Unscaled Zero Point Vibrational Energy (zpe) 20266.8 cm-1
Scaled (by 0.9386) Zero Point Vibrational Energy (zpe) 19022.4 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 MP3/6-31G*
ABC
0.31132 0.28460 0.14868

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP3/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.220
C2 0.000 1.119 0.394
C3 0.000 0.680 -1.005
C4 0.000 -0.680 -1.005
C5 0.000 -1.119 0.394
H6 0.000 0.000 2.302
H7 0.000 2.154 0.718
H8 0.000 1.339 -1.864
H9 0.000 -1.339 -1.864
H10 0.000 -2.154 0.718

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10
C11.39112.32702.32701.39111.08162.21193.36273.36272.2119
C21.39111.46672.27982.23892.21171.08442.26943.33853.2897
C32.32701.46671.36062.27983.37622.26791.08272.19453.3174
C42.32702.27981.36061.46673.37623.31742.19451.08272.2679
C51.39112.23892.27981.46672.21173.28973.33852.26941.0844
H61.08162.21173.37623.37622.21172.67364.37614.37612.6736
H72.21191.08442.26793.31743.28972.67362.70854.34444.3085
H83.36272.26941.08272.19453.33854.37612.70852.67794.3444
H93.36273.33852.19451.08272.26944.37614.34442.67792.7085
H102.21193.28973.31742.26791.08442.67364.30854.34442.7085

picture of cyclopentadienyl radical state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 108.997 C1 C2 H7 126.190
C1 C5 C4 108.997 C1 C5 H10 126.190
C2 C1 C5 107.162 C2 C1 H6 126.419
C2 C3 C4 107.422 C2 C3 H8 125.107
C3 C2 H7 124.813 C3 C4 C5 107.422
C3 C4 H9 127.471 C4 C3 H8 127.471
C4 C5 H10 124.813 C5 C1 H6 126.419
C5 C4 H9 125.107
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability