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

using model chemistry: QCISD/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 QCISD/3-21G*
 hartrees
Energy at 0K-193.328885
Energy at 298.15K 
HF Energy-192.822880
Nuclear repulsion energy175.679736
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/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' 3155 3033 0.00      
2 A1' 3061 2942 0.00      
3 A1' 1584 1522 0.00      
4 A1' 1113 1069 0.00      
5 A1' 939 902 0.00      
6 A1" 1023 984 0.00      
7 A2' 3123 3001 0.00      
8 A2' 958 921 0.00      
9 A2" 3142 3020 72.86      
10 A2" 1260 1211 33.27      
11 A2" 792 761 5.41      
12 E' 3130 3009 43.98      
12 E' 3130 3009 43.98      
13 E' 3055 2936 48.18      
13 E' 3055 2936 48.18      
14 E' 1543 1483 0.47      
14 E' 1543 1483 0.47      
15 E' 1256 1207 1.85      
15 E' 1256 1207 1.85      
16 E' 1116 1072 0.09      
16 E' 1116 1072 0.09      
17 E' 865 831 0.91      
17 E' 865 831 0.91      
18 E' 549 527 0.13      
18 E' 549 527 0.13      
19 E" 1257 1208 0.00      
19 E" 1257 1208 0.00      
20 E" 1163 1118 0.00      
20 E" 1163 1118 0.00      
21 E" 1070 1029 0.00      
21 E" 1070 1029 0.00      
22 E" 741 712 0.00      
22 E" 741 712 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 25820.0 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 24815.6 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 QCISD/3-21G*
ABC
0.22984 0.22984 0.20028

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

Point Group is D3h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.972
C2 0.000 1.268 0.000
C3 1.098 -0.634 0.000
C4 -1.098 -0.634 0.000
C5 0.000 0.000 -0.972
H6 0.000 0.000 2.062
H7 0.000 0.000 -2.062
H8 0.914 1.874 0.000
H9 -0.914 1.874 0.000
H10 1.167 -1.728 0.000
H11 2.080 -0.146 0.000
H12 -2.080 -0.146 0.000
H13 -1.167 -1.728 0.000

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 H6 H7 H8 H9 H10 H11 H12 H13
C11.59781.59781.59781.94461.08993.03452.30072.30072.30072.30072.30072.3007
C21.59782.19622.19621.59782.42082.42081.09651.09653.21542.51522.51523.2154
C31.59782.19622.19621.59782.42082.42082.51523.21541.09651.09653.21542.5152
C41.59782.19622.19621.59782.42082.42083.21542.51522.51523.21541.09651.0965
C51.94461.59781.59781.59783.03451.08992.30072.30072.30072.30072.30072.3007
H61.08992.42082.42082.42083.03454.12432.93272.93272.93272.93272.93272.9327
H73.03452.42082.42082.42081.08994.12432.93272.93272.93272.93272.93272.9327
H82.30071.09652.51523.21542.30072.93272.93271.82703.61172.33313.61174.1601
H92.30071.09653.21542.51522.30072.93272.93271.82704.16013.61172.33313.6117
H102.30073.21541.09652.51522.30072.93272.93273.61174.16011.82703.61172.3331
H112.30072.51521.09653.21542.30072.93272.93272.33313.61171.82704.16013.6117
H122.30072.51523.21541.09652.30072.93272.93273.61172.33313.61174.16011.8270
H132.30073.21542.51521.09652.30072.93272.93274.16013.61172.33313.61171.8270

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 74.962 C1 C2 H8 116.034
C1 C2 H9 116.034 C1 C3 C5 74.962
C1 C3 H10 116.034 C1 C3 H11 116.034
C1 C4 C5 74.962 C1 C4 H12 116.034
C1 C4 H13 116.034 C2 C1 C3 86.824
C2 C1 C4 86.824 C2 C1 H6 127.481
C2 C5 C3 86.824 C2 C5 C4 86.824
C2 C5 H7 127.481 C3 C1 C4 86.824
C3 C1 H6 127.481 C3 C5 C4 86.824
C3 C5 H7 127.481 C4 C1 H6 127.481
C4 C5 H7 127.481 C5 C2 H8 116.034
C5 C2 H9 116.034 C5 C3 H10 116.034
C5 C3 H11 116.034 C5 C4 H12 116.034
C5 C4 H13 116.034 H8 C2 H9 112.842
H10 C3 H11 112.842 H12 C4 H13 112.842
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability