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Experimental data for C5H8 (Bicyclo[1.1.1]pentane)

22 02 02 11 45
INChI INChIKey SMILES IUPAC name
InChI=1S/C5H8/c1-4-2-5(1)3-4/h4-5H,1-3H2 MKCBRYIXFFGIKN-UHFFFAOYSA-N C1(C2)CC2C1
State Conformation
1A1' D3H
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Heat Capacity (298.15K) heat capacity 82.34   J K-1 mol-1 webbook
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference
1 A1' 2976   1992Wib/Ros:8293      
2 A1' 2887          
3 A1' 1509          
4 A1' 1107          
5 A1' 898          
6 A1"             15
7 A2'             6
8 A2'             7
8 A2" 2976           16
9 A2" 1220           17
9 A2" 832           18
10 E' 2976           8
11 E' 2887           9
12 E' 1456           10
13 E' 1232           11
14 E' 1098           12
16 E' 886           13
17 E' 540           14
19 E"            
20 E"            
21 E" 1006          
22 E" 711          

vibrational zero-point energy: 19993.8 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for C5H8 (Bicyclo[1.1.1]pentane).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
0.23994 0.23994   2012Per/Mar:22

Calculated rotational constants for C5H8 (Bicyclo[1.1.1]pentane).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of Bicyclo[1.1.1]pentane

Point Group D3h


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rCC 1.557 0.002 1 2 1992Wib/Ros:8293
rCC 1.874 0.003 1 5 1992Wib/Ros:8293 not bonded
rHC 1.107 0.004 1 6 1992Wib/Ros:8293
rHC 1.107 0.004 2 8 1992Wib/Ros:8293
aHCH 111.7 1.8 8 2 9 1992Wib/Ros:8293

Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for C5H8 (Bicyclo[1.1.1]pentane).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
C-C 6
H-C 8

Connectivity
Atom 1 Atom 2
C1 C2
C1 C3
C1 C4
C1 H6
C2 C5
C2 H8
C2 H9
C3 C5
C3 H10
C3 H11
C4 C5
C4 H12
C4 H13
C5 H7
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A1'

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
9.650       webbook
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 1A1' D3h True           D3h 0 1
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for C5H8 (Bicyclo[1.1.1]pentane).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 1A1' D3h True       D3h 0 1

Calculated electric quadrupole moments for C5H8 (Bicyclo[1.1.1]pentane).

References
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squib reference DOI
1992Wib/Ros:8293 KB Wiberg, RE Rosenberg, ST Waddell "Infrared Intensities: Bicyclo[1.1.1]pentane. A Normal-Corrdinate Analysis and Comparison with [1.1.1]Propellane" J. Phys. Chem. 1992, 96, 8293-8303 10.1021/j100200a017
2012Per/Mar:22 A Perry, MA Martin, JW Nibler, A Maki, A Weber, TA Blake "Coriolis analysis of several high-resolution infrared bands of bicyclo[1.1.1]pentane-d0 and -d1" J. Mol. Spect. 276-277 (2012) 22-32 10.1016/j.jms.2012.06.008
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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