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: CCSD(T)/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 CCSD(T)/6-31+G**
 hartrees
Energy at 0K-194.704677
Energy at 298.15K 
HF Energy-193.920102
Nuclear repulsion energy179.106806
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 CCSD(T)/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' 3158 3030        
2 A1' 3157 3029        
3 A1' 3097 2972        
4 A1' 1586 1522        
5 A1' 1138 1092        
6 A1' 922 885        
7 A1" 1003 963        
8 A2' 980 940        
9 A2" 3150 3023        
10 A2" 1273 1222        
11 A2" 853 818        
12 E' 3164 3036        
12 E' 3164 3036        
13 E' 3092 2967        
13 E' 3092 2967        
14 E' 1538 1476        
14 E' 1538 1476        
15 E' 1274 1223        
15 E' 1274 1223        
16 E' 1132 1086        
16 E' 1131 1086        
17 E' 911 875        
17 E' 911 875        
18 E' 550 528        
18 E' 549 527        
19 E" 1230 1180        
19 E" 1229 1180        
20 E" 1160 1113        
20 E" 1160 1113        
21 E" 1034 992        
21 E" 1034 992        
22 E" 801 769        
22 E" 801 769        

Unscaled Zero Point Vibrational Energy (zpe) 26041.2 cm-1
Scaled (by 0.9596) Zero Point Vibrational Energy (zpe) 24989.1 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 CCSD(T)/6-31+G**
ABC
0.24005 0.24005 0.20777

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/6-31+G**

Point Group is D3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.943
C2 0.000 1.240 0.000
C3 1.074 -0.620 0.000
C4 -1.074 -0.620 0.000
C5 0.000 0.000 -0.943
H6 0.000 0.000 2.033
H7 0.000 0.000 -2.033
H8 0.904 1.855 0.000
H9 -0.904 1.855 0.000
H10 1.154 -1.710 0.000
H11 2.058 -0.144 0.000
H12 -2.058 -0.144 0.000
H13 -1.154 -1.710 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C11.55791.55791.55791.88521.09082.97602.26852.26852.26852.26852.26852.2685
C21.55792.14852.14851.55792.38192.38191.09321.09323.16852.48062.48063.1685
C31.55792.14852.14851.55792.38192.38192.48063.16851.09321.09323.16852.4806
C41.55792.14852.14851.55792.38192.38193.16852.48062.48063.16851.09321.0932
C51.88521.55791.55791.55792.97601.09082.26852.26852.26852.26852.26852.2685
H61.09082.38192.38192.38192.97604.06682.89692.89692.89692.89692.89692.8969
H72.97602.38192.38192.38191.09084.06682.89692.89692.89692.89692.89692.8969
H82.26851.09322.48063.16852.26852.89692.89691.80873.57382.30793.57384.1166
H92.26851.09323.16852.48062.26852.89692.89691.80874.11663.57382.30793.5738
H102.26853.16851.09322.48062.26852.89692.89693.57384.11661.80873.57382.3079
H112.26852.48061.09323.16852.26852.89692.89692.30793.57381.80874.11663.5738
H122.26852.48063.16851.09322.26852.89692.89693.57382.30793.57384.11661.8087
H132.26853.16852.48061.09322.26852.89692.89694.11663.57382.30793.57381.8087

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 74.462 C1 C2 H8 116.572
C1 C2 H9 116.572 C1 C3 C5 74.462
C1 C3 H10 116.572 C1 C3 H11 116.572
C1 C4 C5 74.462 C1 C4 H12 116.572
C1 C4 H13 116.572 C2 C1 C3 87.186
C2 C1 C4 87.186 C2 C1 H6 127.231
C2 C5 C3 87.186 C2 C5 C4 87.186
C2 C5 H7 127.231 C3 C1 C4 87.186
C3 C1 H6 127.231 C3 C5 C4 87.186
C3 C5 H7 127.231 C4 C1 H6 127.231
C4 C5 H7 127.231 C5 C2 H8 116.572
C5 C2 H9 116.572 C5 C3 H10 116.572
C5 C3 H11 116.572 C5 C4 H12 116.572
C5 C4 H13 116.572 H8 C2 H9 111.638
H10 C3 H11 111.638 H12 C4 H13 111.638
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability