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: MP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D3H 1A1'
Energy calculated at MP2/3-21G*
 hartrees
Energy at 0K-193.277423
Energy at 298.15K 
HF Energy-192.824039
Nuclear repulsion energy176.290682
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 MP2/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1' 3197 3042 0.00      
2 A1' 3107 2956 0.00      
3 A1' 1607 1529 0.00      
4 A1' 1121 1066 0.00      
5 A1' 946 900 0.00      
6 A1" 1034 984 0.00      
7 A2' 3178 3024 0.00      
8 A2' 974 927 0.00      
9 A2" 3183 3028 74.68      
10 A2" 1272 1210 36.64      
11 A2" 802 763 4.82      
12 E' 3185 3030 42.53      
12 E' 3185 3030 42.53      
13 E' 3103 2952 47.51      
13 E' 3103 2952 47.51      
14 E' 1565 1489 0.38      
14 E' 1565 1489 0.38      
15 E' 1270 1208 2.09      
15 E' 1270 1208 2.09      
16 E' 1129 1074 0.10      
16 E' 1129 1074 0.10      
17 E' 878 836 0.73      
17 E' 878 836 0.73      
18 E' 554 527 0.13      
18 E' 554 527 0.13      
19 E" 1274 1212 0.00      
19 E" 1274 1212 0.00      
20 E" 1172 1115 0.00      
20 E" 1172 1115 0.00      
21 E" 1084 1032 0.00      
21 E" 1084 1032 0.00      
22 E" 752 716 0.00      
22 E" 752 716 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 26177.4 cm-1
Scaled (by 0.9513) Zero Point Vibrational Energy (zpe) 24902.6 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 MP2/3-21G*
ABC
0.23151 0.23151 0.20158

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

Point Group is D3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.968
C2 0.000 1.264 0.000
C3 1.095 -0.632 0.000
C4 -1.095 -0.632 0.000
C5 0.000 0.000 -0.968
H6 0.000 0.000 2.055
H7 0.000 0.000 -2.055
H8 0.911 1.868 0.000
H9 -0.911 1.868 0.000
H10 1.162 -1.723 0.000
H11 2.073 -0.144 0.000
H12 -2.073 -0.144 0.000
H13 -1.162 -1.723 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C11.59201.59201.59201.93591.08723.02312.29252.29252.29252.29252.29252.2925
C21.59202.18932.18931.59202.41282.41281.09321.09323.20502.50622.50623.2050
C31.59202.18932.18931.59202.41282.41282.50623.20501.09321.09323.20502.5062
C41.59202.18932.18931.59202.41282.41283.20502.50622.50623.20501.09321.0932
C51.93591.59201.59201.59203.02311.08722.29252.29252.29252.29252.29252.2925
H61.08722.41282.41282.41283.02314.11042.92272.92272.92272.92272.92272.9227
H73.02312.41282.41282.41281.08724.11042.92272.92272.92272.92272.92272.9227
H82.29251.09322.50623.20502.29252.92272.92271.82303.59942.32323.59944.1461
H92.29251.09323.20502.50622.29252.92272.92271.82304.14613.59942.32323.5994
H102.29253.20501.09322.50622.29252.92272.92273.59944.14611.82303.59942.3232
H112.29252.50621.09323.20502.29252.92272.92272.32323.59941.82304.14623.5994
H122.29252.50623.20501.09322.29252.92272.92273.59942.32323.59944.14621.8230
H132.29253.20502.50621.09322.29252.92272.92274.14613.59942.32323.59941.8230

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 74.889 C1 C2 H8 115.998
C1 C2 H9 115.998 C1 C3 C5 74.889
C1 C3 H10 115.998 C1 C3 H11 115.998
C1 C4 C5 74.889 C1 C4 H12 115.998
C1 C4 H13 115.998 C2 C1 C3 86.877
C2 C1 C4 86.877 C2 C1 H6 127.445
C2 C5 C3 86.877 C2 C5 C4 86.877
C2 C5 H7 127.445 C3 C1 C4 86.877
C3 C1 H6 127.445 C3 C5 C4 86.877
C3 C5 H7 127.445 C4 C1 H6 127.445
C4 C5 H7 127.445 C5 C2 H8 115.998
C5 C2 H9 115.998 C5 C3 H10 115.998
C5 C3 H11 115.998 C5 C4 H12 115.998
C5 C4 H13 115.998 H8 C2 H9 112.978
H10 C3 H11 112.978 H12 C4 H13 112.978
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability