Cyclic octaatomic sulfur

Formula: S₈
Molecular weight: 256.520
IUPAC Standard InChI: InChI=1S/S8/c1-2-4-6-8-7-5-3-1
IUPAC Standard InChIKey: JLQNHALFVCURHW-UHFFFAOYSA-N
CAS Registry Number: 10544-50-0
Chemical structure:
This structure is also available as a 2d Mol file
Other names: Sulfur (S8); Sulfur octamer; Sulfur, mol. (S8); Cyclooctasulfur; Octathiocane; Orthorhombic sulfur; Sulfur molecule (S8); S8; Cyclooctasulphur; Octasulfur; 115725-44-5; Sulfur
Permanent link for this species. Use this link for bookmarking this species for future reference.
Information on this page:
Other data available:
Data at other public NIST sites:
- X-ray Photoelectron Spectroscopy Database, version 5.0
Options:
- Switch to calorie-based units

Gas phase ion energetics data

Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

Electron affinity determinations

EA (eV)	Method	Reference	Comment
3.590 ± 0.050	LPD	Hunsicker, Jones, et al., 1995	Vertical Detachment Energy: 3.87 eV.; B

Ionization energy determinations

IE (eV)	Method	Reference	Comment
9.3 ± 0.2	EI	Rosinger, Grade, et al., 1983	LBLHLM
9.04 ± 0.03	PI	Berkowitz and Lifshitz, 1968	RDSH
9.6 ± 0.2	EI	Berkowitz and Chupka, 1964	RDSH
7.3 ± 0.3	EI	Hagemann, 1962	RDSH
9.40	PE	Richardson and Weinberger, 1975	Vertical value; LLK
9.23	PE	Boschi and Schmidt, 1973	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
S₃⁺	12.6 ± 0.5	?	EI	Berkowitz and Chupka, 1964	RDSH
S₄⁺	12.5 ± 0.3	?	EI	Berkowitz and Chupka, 1964	RDSH
S₅⁺	10.2	S₃	PI	Berkowitz and Lifshitz, 1968	RDSH
S₆⁺	≤11.0	S₂	PI	Berkowitz and Lifshitz, 1968	RDSH
S₆⁺	10.1 ± 0.3	S₂	EI	Berkowitz and Chupka, 1964	RDSH

References

Go To: Top, Gas phase ion energetics data, Notes

Hunsicker, Jones, et al., 1995
Hunsicker, S.; Jones, R.O.; Gantefor, G., Rings and chains in sulfur cluster anions S- to S-9(-): Theory (simulated annealing) and experiment (photoelectron detachment), J. Chem. Phys., 1995, 102, 15, 5917, https://doi.org/10.1063/1.469326 . [all data]

Rosinger, Grade, et al., 1983
Rosinger, W.; Grade, M.; Hirschwald, W., Detection of ion states of S₂ to S₈ by electron impact, Int. J. Mass Spectrom. Ion Processes, 1983, 47, 239. [all data]

Berkowitz and Lifshitz, 1968
Berkowitz, J.; Lifshitz, C., Photoionization of high temperature vapors. II. Sulfur molecular species, J. Chem. Phys., 1968, 48, 4346. [all data]

Berkowitz and Chupka, 1964
Berkowitz, J.; Chupka, W.A., Vaporization processes involving sulfur, J. Chem. Phys., 1964, 40, 287. [all data]

Hagemann, 1962
Hagemann, R., Determination de la chaleur de formation de S₂O par spectrometrie de masse, Compt. Rend., 1962, 255, 1102. [all data]

Richardson and Weinberger, 1975
Richardson, N.V.; Weinberger, P., The electronic structure of the S₈ molecule, J. Electron Spectrosc. Relat. Phenom., 1975, 6, 109. [all data]

Boschi and Schmidt, 1973
Boschi, R.; Schmidt, W., The photoelectron spectrum and structure of sulfur in the gas phase at 140 C, Inorg. Nucl. Chem. Lett., 1973, 9, 643. [all data]

Notes

Go To: Top, Gas phase ion energetics data, References

Symbols used in this document:

AE Appearance energy

EA Electron affinity
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
Customer support for NIST Standard Reference Data products.