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: MP2/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-31G
 hartrees
Energy at 0K-193.067985
Energy at 298.15K-193.074274
HF Energy-192.617028
Nuclear repulsion energy157.801593
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
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 3274 3133 6.10      
2 A 3254 3113 39.40      
3 A 3241 3101 7.31      
4 A 3142 3006 22.15      
5 A 1538 1471 3.96      
6 A 1529 1463 0.84      
7 A 1307 1250 0.82      
8 A 1196 1144 2.23      
9 A 1132 1083 2.83      
10 A 1055 1010 1.03      
11 A 971 929 3.63      
12 A 918 879 3.07      
13 A 799 765 5.13      
14 A 754 721 68.50      
15 A 436 417 5.99      
16 A 3258 3118 9.61      
17 A 3220 3081 11.18      
18 A 1335 1278 19.60      
19 A 1273 1218 0.02      
20 A 1160 1110 3.62      
21 A 1114 1066 11.01      
22 A 1074 1028 0.19      
23 A 930 890 6.81      
24 A 867 830 6.99      
25 A 823 787 0.54      
26 A 781 748 22.66      
27 A 457 437 2.22      

Unscaled Zero Point Vibrational Energy (zpe) 20419.3 cm-1
Scaled (by 0.9568) Zero Point Vibrational Energy (zpe) 19537.2 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
ABC
0.35056 0.21149 0.16849

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.272 1.071 0.687
C2 -0.272 1.071 -0.687
C3 -0.272 -0.468 0.780
C4 -0.272 -0.468 -0.780
C5 0.935 -1.028 0.000
H6 -0.115 1.843 1.436
H7 -0.115 1.843 -1.436
H8 -0.884 -1.083 1.431
H9 -0.884 -1.083 -1.431
H10 1.873 -0.473 0.000
H11 1.047 -2.115 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11
C11.37321.54262.12662.51731.08752.26442.36043.08262.73153.5162
C21.37322.12661.54262.51732.26441.08753.08262.36042.73153.5162
C31.54262.12661.56051.54262.40813.20651.08452.37562.28312.2496
C42.12661.54261.56051.54263.20652.40812.37561.08452.28312.2496
C52.51732.51731.54261.54263.37803.37802.31522.31521.09001.0923
H61.08752.26442.40813.20653.37802.87273.02594.16893.37404.3680
H72.26441.08753.20652.40813.37802.87274.16893.02593.37404.3680
H82.36043.08261.08452.37562.31523.02594.16892.86263.16592.6158
H93.08262.36042.37561.08452.31524.16893.02592.86263.16592.6158
H102.73152.73152.28312.28311.09003.37403.37403.16593.16591.8374
H113.51623.51622.24962.24961.09234.36804.36802.61582.61581.8374

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 93.481 C1 C2 H7 133.584
C1 C3 C4 86.519 C1 C3 C5 109.358
C1 C3 H8 127.045 C2 C1 C3 93.481
C2 C1 H6 133.584 C2 C4 C3 86.519
C2 C4 C5 109.358 C2 C4 H9 127.045
C3 C1 H6 131.808 C3 C4 C5 59.616
C3 C4 H9 126.895 C3 C5 C4 60.769
C3 C5 H10 119.277 C3 C5 H11 116.196
C4 C2 H7 131.808 C4 C3 C5 59.616
C4 C3 H8 126.895 C4 C5 H10 119.277
C4 C5 H11 116.196 C5 C3 H8 122.635
C5 C4 H9 122.635 H10 C5 H11 114.687
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability