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
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Gas phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| S°gas,1 bar | 430.23 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1977 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. - 6000. |
|---|---|
| A | 180.6697 |
| B | 1.918988 |
| C | -0.520130 |
| D | 0.044394 |
| E | -2.270155 |
| F | -61.56045 |
| G | 635.5496 |
| H | 0.000000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1977 |
Gas phase ion energetics data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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 |
Mass spectrum (electron ionization)
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
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Additional Data
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Due to licensing restrictions, this spectrum cannot be downloaded.
| Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
|---|---|
| Origin | GAZ DE FRANCE D.E.T.N., B.P. 33, LA PLAINE ST. DENIS, FRANCE |
| NIST MS number | 12510 |
Gas Chromatography
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Van Den Dool and Kratz RI, non-polar column, custom temperature program
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | HP-5MS | 2083.2 | Andriamaharavo, 2014 | 30. m/0.25 mm/0.25 μm, He; Program: 60C (1 min) => 5 C/min => 210C => 10 C/min => 280C (15 min) |
Normal alkane RI, non-polar column, temperature ramp
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | HP-5 MS | 1998. | Kotowska, Zalikowski, et al., 2012 | 30. m/0.25 mm/0.25 μm, Helium, 35. C @ 5. min, 3. K/min, 300. C @ 15. min |
Normal alkane RI, non-polar column, custom temperature program
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | HP-5 MS | 2004. | Kotowska, Zalikowski, et al., 2012 | 30. m/0.25 mm/0.25 μm, Helium; Program: not specified |
| Capillary | RTX-5 MS | 2055. | Nadaf, Halimi, et al., 2012 | 15. m/0.25 mm/0.25 μm, Helium; Program: 35 0C (6 min) 5 0C/min -> 150 0C 10 0C/min -> 280 0C (3 min) |
Lee's RI, non-polar column, custom temperature program
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | Methyl Silicone | 342.96 | Eckel, Ross, et al., 1993 | Program: not specified |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
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]
Andriamaharavo, 2014
Andriamaharavo, N.R.,
Retention Data. NIST Mass Spectrometry Data Center., NIST Mass Spectrometry Data Center, 2014. [all data]
Kotowska, Zalikowski, et al., 2012
Kotowska, U.; Zalikowski, M.; Isidorov, V.A.,
HS-SPME/GC-MS analysis of volatile and semi-volatile organic compounds emitted from municipal sewage sludge,
Environ. Monit. Asses., 2012, 184, 5, 2893-2907, https://doi.org/10.1007/s10661-011-2158-8
. [all data]
Nadaf, Halimi, et al., 2012
Nadaf, M.; Halimi, M.; Mortazavi, M.,
Identification of nonpolar chemical composition Spartium junceum flower growing in Iran by GC-MS,
Middle-East J. Sci. Res., 2012, 11, 2, 221-224. [all data]
Eckel, Ross, et al., 1993
Eckel, W.P.; Ross, B.; Isensee, R.K.,
Pentobarbital found in ground water,
Ground Water, 1993, 31, 5, 801-804, https://doi.org/10.1111/j.1745-6584.1993.tb00853.x
. [all data]
Notes
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- Symbols used in this document:
AE Appearance energy EA Electron affinity S°gas,1 bar Entropy of gas at standard conditions (1 bar) - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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