Sulfur difluoride
- Formula: F2S
- Molecular weight: 70.062
- IUPAC Standard InChI: InChI=1S/F2S/c1-3-2
- IUPAC Standard InChIKey: QTJXVIKNLHZIKL-UHFFFAOYSA-N
- CAS Registry Number: 13814-25-0
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - 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:
- Options:
Gas phase thermochemistry data
Go To: Top, Gas phase ion energetics data, References, Notes
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 |
|---|---|---|---|---|---|
| ΔfH°gas | -296.65 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1976 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 257.70 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1976 |
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.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 298. to 1000. | 1000. to 6000. |
|---|---|---|
| A | 33.79492 | 57.99150 |
| B | 62.68050 | 0.121780 |
| C | -61.65417 | -0.025398 |
| D | 21.62843 | 0.001801 |
| E | -0.238158 | -1.894960 |
| F | -309.8064 | -319.5158 |
| G | 281.1188 | 319.2434 |
| H | -296.6464 | -296.6464 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in June, 1976 | Data last reviewed in June, 1976 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data evaluated as indicated in comments:
L - Sharon G. Lias
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
View reactions leading to F2S+ (ion structure unspecified)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| IE (evaluated) | 10.08 | eV | N/A | N/A | L |
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 0.90 ± 0.70 | IMRB | Miller, Miller, et al., 1995 | B |
| >3.10 ± 0.50 | Endo | Langford, Almeida, et al., 1990 | B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 10.08 | PI | Losking and Willner, 1985 | LBLHLM |
| 10.29 ± 0.10 | EI | Gombler, Haas, et al., 1980 | LLK |
| 10.08 | PE | De Leeuw, Mooyman, et al., 1978 | LLK |
| 10.29 ± 0.10 | EI | Hildenbrand, 1973 | LLK |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| FS+ | 13.95 ± 0.10 | F | EI | Gombler, Haas, et al., 1980 | LLK |
| FS+ | ~18. | F | EI | DiLonardo and Trombetti, 1970 | RDSH |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, 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]
Miller, Miller, et al., 1995
Miller, A.E.S.; Miller, T.M.; Viggiano, A.A.; Morris, R.A.; Vandoren, J.M.; Arnold, S.T.; Paulson, J.,
Negative ion chemistry of SF4,
J. Chem. Phys., 1995, 102, 22, 8865, https://doi.org/10.1063/1.468940
. [all data]
Langford, Almeida, et al., 1990
Langford, M.L.; Almeida, D.P.; Harris, F.M.,
Measurements of single ionization energies or electron affinities of SFn molecules (n = 1-5) using double-charge-transfer spectroscopy,
Int. J. Mass Spectrom. Ion Processes, 1990, 98, 147. [all data]
Losking and Willner, 1985
Losking, O.; Willner, H.,
Thermochemische daten und photoionisation-massenspektren von SSF2, FSSF, SF3SF und SF3SSF,
Z. Anorg. Allg. Chem., 1985, 530, 169. [all data]
Gombler, Haas, et al., 1980
Gombler, W.; Haas, A.; Willner, H.,
Chalkogenfluoride in niedrigen oxydationsstufen. V. Die ungewohnlichen chemischen gleichgewichte F3S-SF = 2 SF2 und CF3SF2-SCF3 = 2 CF3SF,
Z. Anorg. Allg. Chem., 1980, 469, 135. [all data]
De Leeuw, Mooyman, et al., 1978
De Leeuw, D.M.; Mooyman, R.; De Lange, C.A.,
He(I) photoelectron spectroscopy of transient species: The SF2 molecule,
Chem. Phys., 1978, 34, 287. [all data]
Hildenbrand, 1973
Hildenbrand, D.L.,
Mass spectrometric studies of some gaseous sulfur fluorides,
J. Phys. Chem., 1973, 77, 897. [all data]
DiLonardo and Trombetti, 1970
DiLonardo, G.; Trombetti, A.,
Spectrum of SF,
J. Chem. Soc. Faraday Trans., 1970, 66, 2694. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy EA Electron affinity IE (evaluated) Recommended ionization energy S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions - 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.