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: QCISD/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D3H 1A1'
Energy calculated at QCISD/6-31G*
 hartrees
Energy at 0K-194.604673
Energy at 298.15K 
HF Energy-193.904517
Nuclear repulsion energy179.250151
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 QCISD/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' 3139 2989 0.00      
2 A1' 3083 2936 0.00      
3 A1' 1597 1521 0.00      
4 A1' 1156 1101 0.00      
5 A1' 937 892 0.00      
6 A1" 1018 970 0.00      
7 A2' 3136 2986 0.00      
8 A2' 991 943 0.00      
9 A2" 3133 2984 115.13      
10 A2" 1294 1232 30.97      
11 A2" 873 831 4.99      
12 E' 3142 2993 63.75      
12 E' 3142 2993 63.75      
13 E' 3077 2931 66.65      
13 E' 3077 2931 66.65      
14 E' 1548 1474 0.09      
14 E' 1548 1474 0.09      
15 E' 1295 1233 1.36      
15 E' 1295 1233 1.36      
16 E' 1143 1089 0.32      
16 E' 1143 1089 0.32      
17 E' 928 884 0.63      
17 E' 928 884 0.63      
18 E' 562 535 0.23      
18 E' 562 535 0.23      
19 E" 1243 1183 0.00      
19 E" 1243 1183 0.00      
20 E" 1181 1124 0.00      
20 E" 1181 1124 0.00      
21 E" 1050 1000 0.00      
21 E" 1050 1000 0.00      
22 E" 817 778 0.00      
22 E" 817 778 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 26164.2 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 24916.2 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 QCISD/6-31G*
ABC
0.24067 0.24067 0.20824

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

Point Group is D3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.940
C2 0.000 1.238 0.000
C3 1.072 -0.619 0.000
C4 -1.072 -0.619 0.000
C5 0.000 0.000 -0.940
H6 0.000 0.000 2.036
H7 0.000 0.000 -2.036
H8 0.906 1.857 0.000
H9 -0.906 1.857 0.000
H10 1.155 -1.713 0.000
H11 2.061 -0.144 0.000
H12 -2.061 -0.144 0.000
H13 -1.155 -1.713 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C11.55431.55431.55431.88051.09552.97592.26992.26992.26992.26992.26992.2699
C21.55432.14362.14361.55432.38242.38241.09741.09743.16872.48112.48113.1687
C31.55432.14362.14361.55432.38242.38242.48113.16871.09741.09743.16872.4811
C41.55432.14362.14361.55432.38242.38243.16872.48112.48113.16871.09741.0974
C51.88051.55431.55431.55432.97591.09552.26992.26992.26992.26992.26992.2699
H61.09552.38242.38242.38242.97594.07142.90052.90052.90052.90052.90052.9005
H72.97592.38242.38242.38241.09554.07142.90052.90052.90052.90052.90052.9005
H82.26991.09742.48113.16872.26992.90052.90051.81203.57852.31013.57854.1221
H92.26991.09743.16872.48112.26992.90052.90051.81204.12213.57852.31013.5785
H102.26993.16871.09742.48112.26992.90052.90053.57854.12211.81203.57852.3101
H112.26992.48111.09743.16872.26992.90052.90052.31013.57851.81204.12213.5785
H122.26992.48113.16871.09742.26992.90052.90053.57852.31013.57854.12211.8120
H132.26993.16872.48111.09742.26992.90052.90054.12213.57852.31013.57851.8120

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 74.449 C1 C2 H8 116.698
C1 C2 H9 116.698 C1 C3 C5 74.449
C1 C3 H10 116.698 C1 C3 H11 116.698
C1 C4 C5 74.449 C1 C4 H12 116.698
C1 C4 H13 116.698 C2 C1 C3 87.195
C2 C1 C4 87.195 C2 C1 H6 127.225
C2 C5 C3 87.195 C2 C5 C4 87.195
C2 C5 H7 127.225 C3 C1 C4 87.195
C3 C1 H6 127.225 C3 C5 C4 87.195
C3 C5 H7 127.225 C4 C1 H6 127.225
C4 C5 H7 127.225 C5 C2 H8 116.698
C5 C2 H9 116.698 C5 C3 H10 116.698
C5 C3 H11 116.698 C5 C4 H12 116.698
C5 C4 H13 116.698 H8 C2 H9 111.301
H10 C3 H11 111.301 H12 C4 H13 111.301
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability