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 C5H6 (Bicyclo[2.1.0]pent-2-ene)

using model chemistry: MP2=FULL/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2=FULL/3-21G*
 hartrees
Energy at 0K-192.075086
Energy at 298.15K-192.081344
Nuclear repulsion energy157.817826
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=FULL/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 3305 3133 3.63      
2 A 3272 3102 23.52      
3 A 3270 3100 3.77      
4 A 3166 3001 16.12      
5 A 1545 1465 2.29      
6 A 1517 1438 2.30      
7 A 1289 1222 1.22      
8 A 1174 1113 2.36      
9 A 1121 1063 3.97      
10 A 1022 969 0.51      
11 A 952 903 2.32      
12 A 917 869 6.87      
13 A 794 753 13.18      
14 A 744 705 58.65      
15 A 441 418 7.11      
16 A 3289 3118 4.30      
17 A 3237 3068 7.63      
18 A 1328 1259 22.84      
19 A 1269 1203 0.10      
20 A 1161 1101 5.93      
21 A 1104 1047 9.98      
22 A 1080 1024 0.16      
23 A 917 869 11.93      
24 A 849 805 1.01      
25 A 840 796 0.07      
26 A 764 724 19.38      
27 A 453 429 2.62      

Unscaled Zero Point Vibrational Energy (zpe) 20410.0 cm-1
Scaled (by 0.948) Zero Point Vibrational Energy (zpe) 19348.7 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=FULL/3-21G*
ABC
0.34755 0.21211 0.16966

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.277 1.067 0.683
C2 -0.277 1.067 -0.683
C3 -0.277 -0.481 0.784
C4 -0.277 -0.481 -0.784
C5 0.951 -1.004 0.000
H6 -0.127 1.838 1.426
H7 -0.127 1.838 -1.426
H8 -0.873 -1.096 1.438
H9 -0.873 -1.096 -1.438
H10 1.859 -0.412 0.000
H11 1.086 -2.083 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11
C11.36531.55092.13202.50221.08162.25052.36763.08762.68643.4997
C21.36532.13201.55092.50222.25051.08163.08762.36762.68643.4997
C31.55092.13201.56741.54772.41063.20661.07822.38152.27652.2451
C42.13201.55091.56741.54773.20662.41062.38151.07822.27652.2451
C52.50222.50221.54771.54773.35723.35722.32462.32461.08401.0882
H61.08162.25052.41063.20663.35722.85283.02744.16793.32304.3453
H72.25051.08163.20662.41063.35722.85284.16793.02743.32304.3453
H82.36763.08761.07822.38152.32463.02744.16792.87663.16262.6231
H93.08762.36762.38151.07822.32464.16793.02742.87663.16262.6231
H102.68642.68642.27652.27651.08403.32303.32303.16263.16261.8416
H113.49973.49972.24512.24511.08824.34534.34532.62312.62311.8416

picture of Bicyclo[2.1.0]pent-2-ene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C4 93.735 C1 C2 H7 133.443
C1 C3 C4 86.265 C1 C3 C5 107.708
C1 C3 H8 127.535 C2 C1 C3 93.735
C2 C1 H6 133.443 C2 C4 C3 86.265
C2 C4 C5 107.708 C2 C4 H9 127.535
C3 C1 H6 131.791 C3 C4 C5 59.578
C3 C4 H9 127.379 C3 C5 C4 60.844
C3 C5 H10 118.713 C3 C5 H11 115.703
C4 C2 H7 131.791 C4 C3 C5 59.578
C4 C3 H8 127.379 C4 C5 H10 118.713
C4 C5 H11 115.703 C5 C3 H8 123.576
C5 C4 H9 123.576 H10 C5 H11 115.947
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability