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Experimental data for S8 (Octasulfur)

22 02 02 11 45
Other names
Cyclic octaatomic sulfur; Sulfur molecule; Cyclooctasulfur; Sulfur (S8); Sulfur; Octathiocane; Orthorhombic sulfur; Sulfur octamer; Cyclooctasulphur;
INChI INChIKey SMILES IUPAC name
InChI=1S/S8/c1-2-4-6-8-7-5-3-1 JLQNHALFVCURHW-UHFFFAOYSA-N S1SSSSSSS1 Octathiocane
State Conformation
1A1 D4D
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation 100.42 0.63 kJ mol-1 JANAF
Hfg(0K) enthalpy of formation 104.39 0.63 kJ mol-1 JANAF
Entropy (298.15K) entropy 430.31 0.05 J K-1 mol-1 JANAF
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 31.32   kJ mol-1 JANAF
Heat Capacity (298.15K) heat capacity 156.04   J K-1 mol-1 JANAF
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 475   JANAF       reference obscure
2 A1 218          
3 B1 411          
4 B2 243          
5 E1 471          
6 E1 191          
7 E2 475          
8 E2 152          
9 E2 56          
10 E3 437          
11 E3 248          

vibrational zero-point energy: 2703.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for S8 (Octasulfur).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
0.02177 0.02177 0.01186 webbook

Calculated rotational constants for S8 (Octasulfur).
Product of moments of inertia moments of inertia
8.524378E+08amu3Å6   3.90328863478272E-111gm3 cm6
Geometric Data
picture of Octasulfur

Point Group D4d


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
rSS 2.059 0.002 1 5 1972Cot/Wil
aSSS 107.9 0.6 1 5 4 1972Cot/Wil
dSSSS 98.9 1 8 2 7 1972Cot/Wil

Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for S8 (Octasulfur).

Bond descriptions


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

Connectivity
Atom 1 Atom 2
S1 S5
S1 S8
S2 S7
S2 S8
S3 S6
S3 S7
S4 S5
S4 S6
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
9.300 0.200 9.400   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 D4d True           D4d 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 S8 (Octasulfur).
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 D4d True       D4d 0 1

Calculated electric quadrupole moments for S8 (Octasulfur).

References
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squib reference DOI
1972Cot/Wil FA Cotton, G Wilkinson "Advanced Inorganic Chemistry, Third edition" Interscience Publishers, New York 1972  
JANAF Chase, M.W., Jr.; Davies, C.A.; Downey, J.R., Jr.; Frurip, D.J.; McDonald, R.A.; Syverud, A.N., JANAF Thermochemical Tables (Third Edition), J. Phys. Chem. Ref. Data,Suppl. 1, 1985, 14, 1.  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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