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 C5H8 (Bicyclo[1.1.1]pentane)

using model chemistry: MP2=FULL/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D3H 1A1'
Energy calculated at MP2=FULL/6-31+G**
 hartrees
Energy at 0K-194.656956
Energy at 298.15K 
HF Energy-193.920721
Nuclear repulsion energy180.112786
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/6-31+G**
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' 3190 2996 0.00      
2 A1' 3129 2939 0.00      
3 A1' 1597 1500 0.00      
4 A1' 1157 1087 0.00      
5 A1' 923 867 0.00      
6 A1" 1014 953 0.00      
7 A2' 3203 3008 0.00      
8 A2' 992 932 0.00      
9 A2" 3185 2992 121.38      
10 A2" 1282 1204 44.91      
11 A2" 872 819 6.05      
12 E' 3207 3012 62.57      
12 E' 3207 3012 62.57      
13 E' 3126 2936 76.28      
13 E' 3126 2936 76.28      
14 E' 1546 1452 0.13      
14 E' 1546 1452 0.13      
15 E' 1286 1208 2.62      
15 E' 1286 1208 2.62      
16 E' 1141 1071 0.53      
16 E' 1141 1071 0.53      
17 E' 933 877 0.61      
17 E' 933 877 0.61      
18 E' 558 524 0.14      
18 E' 558 524 0.14      
19 E" 1244 1168 0.00      
19 E" 1244 1168 0.00      
20 E" 1165 1094 0.00      
20 E" 1165 1094 0.00      
21 E" 1044 980 0.00      
21 E" 1044 980 0.00      
22 E" 823 773 0.00      
22 E" 823 773 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 26345.4 cm-1
Scaled (by 0.9392) Zero Point Vibrational Energy (zpe) 24743.6 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/6-31+G**
ABC
0.24293 0.24293 0.21016

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

Point Group is D3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.936
C2 0.000 1.233 0.000
C3 1.068 -0.616 0.000
C4 -1.068 -0.616 0.000
C5 0.000 0.000 -0.936
H6 0.000 0.000 2.024
H7 0.000 0.000 -2.024
H8 0.903 1.844 0.000
H9 -0.903 1.844 0.000
H10 1.146 -1.704 0.000
H11 2.049 -0.140 0.000
H12 -2.049 -0.140 0.000
H13 -1.146 -1.704 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C11.54791.54791.54791.87201.08822.96022.25662.25662.25662.25662.25662.2566
C21.54792.13542.13541.54792.37012.37011.09021.09023.15242.46632.46633.1524
C31.54792.13542.13541.54792.37012.37012.46633.15241.09021.09023.15242.4663
C41.54792.13542.13541.54792.37012.37013.15242.46632.46633.15241.09021.0902
C51.87201.54791.54791.54792.96021.08822.25662.25662.25662.25662.25662.2566
H61.08822.37012.37012.37012.96024.04832.88332.88332.88332.88332.88332.8833
H72.96022.37012.37012.37011.08824.04832.88332.88332.88332.88332.88332.8833
H82.25661.09022.46633.15242.25662.88332.88331.80523.55652.29193.55654.0971
H92.25661.09023.15242.46632.25662.88332.88331.80524.09713.55652.29193.5565
H102.25663.15241.09022.46632.25662.88332.88333.55654.09711.80523.55652.2919
H112.25662.46631.09023.15242.25662.88332.88332.29193.55651.80524.09713.5565
H122.25662.46633.15241.09022.25662.88332.88333.55652.29193.55654.09711.8052
H132.25663.15242.46631.09022.25662.88332.88334.09713.55652.29193.55651.8052

picture of Bicyclo[1.1.1]pentane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C5 74.413 C1 C2 H8 116.533
C1 C2 H9 116.533 C1 C3 C5 74.413
C1 C3 H10 116.533 C1 C3 H11 116.533
C1 C4 C5 74.413 C1 C4 H12 116.533
C1 C4 H13 116.533 C2 C1 C3 87.222
C2 C1 C4 87.222 C2 C1 H6 127.206
C2 C5 C3 87.222 C2 C5 C4 87.222
C2 C5 H7 127.206 C3 C1 C4 87.222
C3 C1 H6 127.206 C3 C5 C4 87.222
C3 C5 H7 127.206 C4 C1 H6 127.206
C4 C5 H7 127.206 C5 C2 H8 116.533
C5 C2 H9 116.533 C5 C3 H10 116.533
C5 C3 H11 116.533 C5 C4 H12 116.533
C5 C4 H13 116.533 H8 C2 H9 111.767
H10 C3 H11 111.767 H12 C4 H13 111.767
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability