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All results from a given calculation for C5H8 (Bicyclo[1.1.1]pentane)

using model chemistry: PM3

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
Energy calculated at PM3
 hartrees
Energy at 0K 
Energy at 298.15K0.108782
HF Energy0.108782
Nuclear repulsion energy107.225576
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 PM3
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' 3174 3091 0.00      
2 A1' 3126 3045 0.00      
3 A1' 1479 1440 0.00      
4 A1' 1274 1241 0.00      
5 A1' 916 892 0.00      
6 A1" 896 872 0.00      
7 A2' 3067 2987 0.00      
8 A2' 979 953 0.00      
9 A2" 3168 3086 16.92      
10 A2" 1228 1196 3.66      
11 A2" 910 886 0.22      
12 E' 3127 3045 2.02      
12 E' 3127 3045 2.02      
13 E' 3075 2995 0.42      
13 E' 3075 2995 0.42      
14 E' 1442 1404 0.27      
14 E' 1442 1404 0.27      
15 E' 1219 1187 0.07      
15 E' 1219 1187 0.07      
16 E' 1043 1016 0.02      
16 E' 1043 1016 0.02      
17 E' 949 924 0.24      
17 E' 949 924 0.24      
18 E' 593 578 0.44      
18 E' 593 578 0.44      
19 E" 1189 1158 0.00      
19 E" 1189 1158 0.00      
20 E" 1069 1041 0.00      
20 E" 1069 1041 0.00      
21 E" 964 939 0.00      
21 E" 964 939 0.00      
22 E" 736 717 0.00      
22 E" 736 717 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 25512.2 cm-1
Scaled (by 0.974) Zero Point Vibrational Energy (zpe) 24848.9 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 PM3
ABC
0.23576 0.23576 0.20360

See section I.F.4 to change rotational constant units
Geometric Data calculated at PM3

Point Group is D3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.952
C2 0.000 1.251 0.000
C3 1.083 -0.625 0.000
C4 -1.083 -0.625 0.000
C5 0.000 0.000 -0.952
H6 0.000 0.000 2.038
H7 0.000 0.000 -2.038
H8 0.890 1.893 0.000
H9 -0.890 1.893 0.000
H10 1.195 -1.717 0.000
H11 2.084 -0.176 0.000
H12 -2.084 -0.176 0.000
H13 -1.195 -1.717 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C11.57181.57181.57181.90331.08612.98942.29812.29812.29812.29812.29812.2981
C21.57182.16682.16681.57182.39112.39111.09731.09733.19952.52602.52603.1995
C31.57182.16682.16681.57182.39112.39112.52603.19951.09731.09733.19952.5260
C41.57182.16682.16681.57182.39112.39113.19952.52602.52603.19951.09731.0973
C51.90331.57181.57181.57182.98941.08612.29812.29812.29812.29812.29812.2981
H61.08612.39112.39112.39112.98944.07552.92032.92032.92032.92032.92032.9203
H72.98942.39112.39112.39111.08614.07552.92032.92032.92032.92032.92032.9203
H82.29811.09732.52603.19952.29812.92032.92031.77973.62312.38903.62314.1688
H92.29811.09733.19952.52602.29812.92032.92031.77974.16883.62312.38903.6231
H102.29813.19951.09732.52602.29812.92032.92033.62314.16881.77973.62312.3891
H112.29812.52601.09733.19952.29812.92032.92032.38903.62311.77974.16883.6231
H122.29812.52603.19951.09732.29812.92032.92033.62312.38903.62314.16881.7797
H132.29813.19952.52601.09732.29812.92032.92034.16883.62312.38913.62311.7797

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 74.522 C1 C2 H8 117.756
C1 C2 H9 117.756 C1 C3 C5 74.522
C1 C3 H10 117.756 C1 C3 H11 117.756
C1 C4 C5 74.522 C1 C4 H12 117.756
C1 C4 H13 117.756 C2 C1 C3 87.143
C2 C1 C4 87.143 C2 C1 H6 127.261
C2 C5 C3 87.143 C2 C5 C4 87.143
C2 C5 H7 127.261 C3 C1 C4 87.143
C3 C1 H6 127.261 C3 C5 C4 87.143
C3 C5 H7 127.261 C4 C1 H6 127.261
C4 C5 H7 127.261 C5 C2 H8 117.756
C5 C2 H9 117.756 C5 C3 H10 117.756
C5 C3 H11 117.756 C5 C4 H12 117.756
C5 C4 H13 117.756 H8 C2 H9 108.374
H10 C3 H11 108.374 H12 C4 H13 108.374
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability