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: MP2/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D3H 1A1'
Energy calculated at MP2/6-31G**
 hartrees
Energy at 0K-194.623392
Energy at 298.15K 
HF Energy-193.918569
Nuclear repulsion energy180.102238
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 A1' 3198 2995 0.00      
2 A1' 3136 2937 0.00      
3 A1' 1606 1504 0.00      
4 A1' 1164 1090 0.00      
5 A1' 927 869 0.00      
6 A1" 1026 961 0.00      
7 A2' 3209 3005 0.00      
8 A2' 995 932 0.00      
9 A2" 3192 2990 108.52      
10 A2" 1296 1214 30.19      
11 A2" 882 826 3.55      
12 E' 3214 3010 56.73      
12 E' 3214 3010 56.73      
13 E' 3133 2934 64.50      
13 E' 3133 2934 64.50      
14 E' 1554 1456 0.00      
14 E' 1554 1456 0.00      
15 E' 1301 1218 1.52      
15 E' 1301 1218 1.52      
16 E' 1147 1074 0.61      
16 E' 1147 1074 0.61      
17 E' 941 882 0.20      
17 E' 941 882 0.20      
18 E' 557 522 0.15      
18 E' 557 522 0.15      
19 E" 1249 1170 0.00      
19 E" 1249 1170 0.00      
20 E" 1179 1104 0.00      
20 E" 1179 1104 0.00      
21 E" 1057 990 0.00      
21 E" 1057 990 0.00      
22 E" 830 777 0.00      
22 E" 830 777 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 26478.5 cm-1
Scaled (by 0.9365) Zero Point Vibrational Energy (zpe) 24797.1 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 MP2/6-31G**
ABC
0.24290 0.24290 0.21020

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

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 1.067 -0.616 0.000
C4 -1.067 -0.616 0.000
C5 0.000 0.000 -0.936
H6 0.000 0.000 2.025
H7 0.000 0.000 -2.025
H8 0.902 1.845 0.000
H9 -0.902 1.845 0.000
H10 1.146 -1.704 0.000
H11 2.049 -0.141 0.000
H12 -2.049 -0.141 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
C11.54781.54781.54781.87251.08862.96112.25712.25712.25712.25712.25712.2571
C21.54782.13492.13491.54782.37052.37051.09061.09063.15252.46672.46673.1525
C31.54782.13492.13491.54782.37052.37052.46673.15251.09061.09063.15252.4667
C41.54782.13492.13491.54782.37052.37053.15252.46672.46673.15251.09061.0906
C51.87251.54781.54781.54782.96111.08862.25712.25712.25712.25712.25712.2571
H61.08862.37052.37052.37052.96114.04972.88412.88412.88412.88412.88412.8841
H72.96112.37052.37052.37051.08864.04972.88412.88412.88412.88412.88412.8841
H82.25711.09062.46673.15252.25712.88412.88411.80503.55732.29293.55734.0979
H92.25711.09063.15252.46672.25712.88412.88411.80504.09793.55732.29293.5573
H102.25713.15251.09062.46672.25712.88412.88413.55734.09791.80503.55732.2929
H112.25712.46671.09063.15252.25712.88412.88412.29293.55731.80504.09793.5573
H122.25712.46673.15251.09062.25712.88412.88413.55732.29293.55734.09791.8050
H132.25713.15252.46671.09062.25712.88412.88414.09793.55732.29293.55731.8050

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 74.441 C1 C2 H8 116.557
C1 C2 H9 116.557 C1 C3 C5 74.441
C1 C3 H10 116.557 C1 C3 H11 116.557
C1 C4 C5 74.441 C1 C4 H12 116.557
C1 C4 H13 116.557 C2 C1 C3 87.201
C2 C1 C4 87.201 C2 C1 H6 127.221
C2 C5 C3 87.201 C2 C5 C4 87.201
C2 C5 H7 127.221 C3 C1 C4 87.201
C3 C1 H6 127.221 C3 C5 C4 87.201
C3 C5 H7 127.221 C4 C1 H6 127.221
C4 C5 H7 127.221 C5 C2 H8 116.557
C5 C2 H9 116.557 C5 C3 H10 116.557
C5 C3 H11 116.557 C5 C4 H12 116.557
C5 C4 H13 116.557 H8 C2 H9 111.689
H10 C3 H11 111.689 H12 C4 H13 111.689
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability