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:
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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 | -70.901 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1976 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 61.592 | cal/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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1000. | 1000. to 6000. |
|---|---|---|
| A | 8.077180 | 13.86030 |
| B | 14.98100 | 0.029106 |
| C | -14.73570 | -0.006070 |
| D | 5.169319 | 0.000430 |
| E | -0.056921 | -0.452906 |
| F | -74.04551 | -76.36611 |
| G | 67.18901 | 76.30100 |
| H | -70.90019 | -70.90019 |
| 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
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