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

using model chemistry: QCISD(T)/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(T)/6-31G*
 hartrees
Energy at 0K-194.629358
Energy at 298.15K 
HF Energy-193.904018
Nuclear repulsion energy178.896338
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(T)/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' 3116 2989        
2 A1' 3061 2937        
3 A1' 1585 1520        
4 A1' 1143 1096        
5 A1' 927 889        
6 A1" 1007 966        
7 A2' 3117 2990        
8 A2' 982 942        
9 A2" 3110 2984        
10 A2" 1278 1226        
11 A2" 860 825        
12 E' 3123 2996        
12 E' 3123 2996        
13 E' 3057 2932        
13 E' 3057 2932        
14 E' 1537 1474        
14 E' 1536 1474        
15 E' 1278 1226        
15 E' 1278 1226        
16 E' 1133 1087        
16 E' 1133 1087        
17 E' 915 878        
17 E' 915 878        
18 E' 555 533        
18 E' 554 532        
19 E" 1228 1178        
19 E" 1228 1178        
20 E" 1166 1118        
20 E" 1166 1118        
21 E" 1039 997        
21 E" 1039 996        
22 E" 805 772        
22 E" 805 772        

Unscaled Zero Point Vibrational Energy (zpe) 25927.2 cm-1
Scaled (by 0.9593) Zero Point Vibrational Energy (zpe) 24872.0 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(T)/6-31G*
ABC
0.23967 0.23967 0.20745

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

Point Group is D3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.942
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 -0.942
H6 0.000 0.000 2.040
H7 0.000 0.000 -2.040
H8 0.908 1.860 0.000
H9 -0.908 1.860 0.000
H10 1.156 -1.716 0.000
H11 2.064 -0.143 0.000
H12 -2.064 -0.143 0.000
H13 -1.156 -1.716 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C11.55761.55761.55761.88501.09742.98232.27392.27392.27392.27392.27392.2739
C21.55762.14802.14801.55762.38722.38721.09911.09913.17442.48512.48513.1744
C31.55762.14802.14801.55762.38722.38722.48513.17441.09911.09913.17442.4851
C41.55762.14802.14801.55762.38722.38723.17442.48512.48513.17441.09911.0991
C51.88501.55761.55761.55762.98231.09742.27392.27392.27392.27392.27392.2739
H61.09742.38722.38722.38722.98234.07972.90572.90572.90572.90572.90572.9057
H72.98232.38722.38722.38721.09744.07972.90572.90572.90572.90572.90572.9057
H82.27391.09912.48513.17442.27392.90572.90571.81603.58422.31283.58424.1288
H92.27391.09913.17442.48512.27392.90572.90571.81604.12883.58422.31283.5842
H102.27393.17441.09912.48512.27392.90572.90573.58424.12881.81603.58422.3128
H112.27392.48511.09913.17442.27392.90572.90572.31283.58421.81604.12883.5842
H122.27392.48513.17441.09912.27392.90572.90573.58422.31283.58424.12881.8160
H132.27393.17442.48511.09912.27392.90572.90574.12883.58422.31283.58421.8160

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 74.468 C1 C2 H8 116.657
C1 C2 H9 116.657 C1 C3 C5 74.468
C1 C3 H10 116.657 C1 C3 H11 116.657
C1 C4 C5 74.468 C1 C4 H12 116.657
C1 C4 H13 116.657 C2 C1 C3 87.181
C2 C1 C4 87.181 C2 C1 H6 127.234
C2 C5 C3 87.181 C2 C5 C4 87.181
C2 C5 H7 127.234 C3 C1 C4 87.181
C3 C1 H6 127.234 C3 C5 C4 87.181
C3 C5 H7 127.234 C4 C1 H6 127.234
C4 C5 H7 127.234 C5 C2 H8 116.657
C5 C2 H9 116.657 C5 C3 H10 116.657
C5 C3 H11 116.657 C5 C4 H12 116.657
C5 C4 H13 116.657 H8 C2 H9 111.401
H10 C3 H11 111.401 H12 C4 H13 111.401
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability