Methanethiol
- Formula: CH4S
- Molecular weight: 48.107
- IUPAC Standard InChIKey: LSDPWZHWYPCBBB-UHFFFAOYSA-N
- CAS Registry Number: 74-93-1
- 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. - Other names: Methyl mercaptan; Mercaptomethane; CH3SH; Methyl sulfhydrate; Methyl thioalcohol; Mercaptan methylique; Methaanthiol; Methanthiol; Methvtiolo; Methylmercaptaan; Metilmercaptano; Rcra waste number U153; Thiomethanol; UN 1064; Methanethiole
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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.
Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | -5.46 ± 0.14 | kcal/mol | Ccr | Good, Lacina, et al., 1961 |
Condensed 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.
Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°liquid | -11.15 ± 0.13 | kcal/mol | Ccr | Good, Lacina, et al., 1961 | ALS |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°liquid | -363.47 ± 0.12 | kcal/mol | Ccr | Good, Lacina, et al., 1961 | Reanalyzed by Cox and Pilcher, 1970, Original value = -363.0 ± 0.12 kcal/mol; ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid | 39.011 | cal/mol*K | N/A | Russell, Osborne, et al., 1942 | DH |
Constant pressure heat capacity of liquid
Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
21.28 | 280. | Russell, Osborne, et al., 1942 | T = 15 to 280 K.; DH |
Phase change 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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
DH - Eugene S. Domalski and Elizabeth D. Hearing
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 279.1 ± 0.5 | K | AVG | N/A | Average of 6 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 150.18 | K | N/A | Morris, Lanum, et al., 1960 | Uncertainty assigned by TRC = 0.02 K; TRC |
Tfus | 150.1 | K | N/A | Teets, 1934 | Uncertainty assigned by TRC = 0.5 K; TRC |
Tfus | 150.1 | K | N/A | Ellis and Reid, 1932 | Uncertainty assigned by TRC = 0.4 K; TRC |
Tfus | 152.15 | K | N/A | Timmermans and Mattaar, 1921 | Uncertainty assigned by TRC = 0.6 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 150.14 | K | N/A | Russell, Osborne, et al., 1942, 2 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.05 K; TRC |
Ttriple | 150.16 | K | N/A | Russell, Osborne, et al., 1942, 2 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.03 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 469.9 | K | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.4 K; by disappearance of meniscus turbidity; TRC |
Tc | 469.9 | K | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.4 K; by appearance of turbidity; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 71.35 | atm | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.5000 atm; vapor pressure at Tc; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 6.891 | mol/l | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.04 mol/l; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 5.69 | kcal/mol | N/A | Reid, 1972 | AC |
ΔvapH° | 5.69 ± 0.02 | kcal/mol | V | Good, Lacina, et al., 1961 | ALS |
ΔvapH° | 5.71 | kcal/mol | N/A | Good, Lacina, et al., 1961 | DRB |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
5.8719 | 279.12 | N/A | Russell, Osborne, et al., 1942 | P = 101.325 kPa; DH |
6.50 | 223. | N/A | Dykyj, Svoboda, et al., 1999 | Based on data from 208. to 298. K.; AC |
6.02 | 359. | A | Stephenson and Malanowski, 1987 | Based on data from 267. to 359. K.; AC |
6.14 | 268. | A | Stephenson and Malanowski, 1987 | Based on data from 221. to 283. K.; AC |
5.66 | 360. | A | Stephenson and Malanowski, 1987 | Based on data from 345. to 424. K.; AC |
5.78 | 429. | A | Stephenson and Malanowski, 1987 | Based on data from 414. to 470. K.; AC |
6.17 | 264. | N/A | Stephenson and Malanowski, 1987 | Based on data from 222. to 279. K. See also Russell, Osborne, et al., 1942.; AC |
Entropy of vaporization
ΔvapS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
21.04 | 279.12 | Russell, Osborne, et al., 1942 | P; DH |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
279.9 to 458. | 4.34810 | 1122.494 | -21.748 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
221.87 to 279.13 | 4.18630 | 1031.431 | -32.72 | Russell, Osborne, et al., 1942 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
1.4 | 150.2 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
0.380 | 137.6 | Domalski and Hearing, 1996 | CAL |
9.400 | 150.2 |
Enthalpy of phase transition
ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
0.05251 | 137.6 | crystaline, II | crystaline, I | Russell, Osborne, et al., 1942 | DH |
1.411 | 150.16 | crystaline, I | liquid | Russell, Osborne, et al., 1942 | DH |
Entropy of phase transition
ΔStrs (cal/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
0.382 | 137.6 | crystaline, II | crystaline, I | Russell, Osborne, et al., 1942 | DH |
9.398 | 150.16 | crystaline, I | liquid | Russell, Osborne, et al., 1942 | DH |
Reaction 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.
Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
By formula: F- + CH4S = (F- • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 34.2 ± 2.0 | kcal/mol | IMRE | Larson and McMahon, 1983 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 23.2 | cal/mol*K | N/A | Larson and McMahon, 1983 | gas phase; switching reaction(F-)H2O, Entropy change calculated or estimated; Arshadi, Yamdagni, et al., 1970; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 27.3 ± 2.0 | kcal/mol | IMRE | Larson and McMahon, 1983 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M |
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 357.6 ± 2.0 | kcal/mol | D-EA | Schwartz, Davico, et al., 2000 | gas phase; B |
ΔrH° | 357.5 ± 2.0 | kcal/mol | D-EA | Moran and Ellison, 1988 | gas phase; B |
ΔrH° | 356.9 ± 2.2 | kcal/mol | G+TS | Bartmess, Scott, et al., 1979 | gas phase; value altered from reference due to change in acidity scale; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 350.6 ± 2.0 | kcal/mol | IMRE | Bartmess, Scott, et al., 1979 | gas phase; value altered from reference due to change in acidity scale; B |
CH3S- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 395.3 ± 2.6 | kcal/mol | G+TS | Kass, Guo, et al., 1990 | gas phase; Acidity between D2O and Me2NH.; B |
ΔrH° | 391.6 ± 7.7 | kcal/mol | D-EA | Kass, Guo, et al., 1990 | gas phase; Between O2 and SO2. Explains bad anchor in McIver Jr. and Fukuda, 1982; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 388.2 ± 2.5 | kcal/mol | IMRB | Kass, Guo, et al., 1990 | gas phase; Acidity between D2O and Me2NH.; B |
By formula: (CH6N+ • 2C2H3N) + CH4S = (CH6N+ • CH4S • 2C2H3N)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 7.8 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 20. | cal/mol*K | N/A | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; Entropy change calculated or estimated; M |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
2.4 | 270. | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; Entropy change calculated or estimated; M |
By formula: Cl- + CH4S = (Cl- • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15.5 ± 3.0 | kcal/mol | IMRB | Staneke, Groothuis, et al., 1995 | gas phase; Chloride affinity comparable to that of CHCl3; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 10.8 ± 3.0 | kcal/mol | IMRB | Staneke, Groothuis, et al., 1995 | gas phase; Chloride affinity comparable to that of CHCl3; B |
By formula: C2H3O2- + CH4S = (C2H3O2- • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 14.9 ± 1.0 | kcal/mol | TDAs | Meot-ner, 1988 | gas phase; B,M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.8 | cal/mol*K | PHPMS | Meot-ner, 1988 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 8.1 ± 1.0 | kcal/mol | TDAs | Meot-ner, 1988 | gas phase; B |
By formula: (CH6N+ • C2H3N) + CH4S = (CH6N+ • CH4S • C2H3N)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 9.9 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 20.0 | cal/mol*K | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
By formula: CH6N+ + CH4S = (CH6N+ • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.4 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.1 | cal/mol*K | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
By formula: HI + CH3IS = CH4S + I2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -2.88 ± 0.54 | kcal/mol | Eqk | Shum and Benson, 1983 | gas phase; ALS |
Henry's Law 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 by: Rolf Sander
Henry's Law constant (water solution)
kH(T) = k°H exp(d(ln(kH))/d(1/T) ((1/T) - 1/(298.15 K)))
k°H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(kH))/d(1/T) = Temperature dependence constant (K)
k°H (mol/(kg*bar)) | d(ln(kH))/d(1/T) (K) | Method | Reference | Comment |
---|---|---|---|---|
0.20 | 2800. | M | N/A | |
0.71 | E | N/A | Calculated molecular structure relationship. | |
0.39 | 3100. | M | N/A | |
0.26 | 1600. | X | N/A | |
0.33 | M | N/A |
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 evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias
Data compiled as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
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
View reactions leading to CH4S+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 9.439 ± 0.005 | eV | N/A | N/A | L |
Quantity | Value | Units | Method | Reference | Comment |
Proton affinity (review) | 184.8 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 177. | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
ΔfH°(+) ion | 213. ± 2. | kcal/mol | N/A | N/A | |
Quantity | Value | Units | Method | Reference | Comment |
ΔfH(+) ion,0K | 215. ± 2. | kcal/mol | N/A | N/A |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
9.446 ± 0.010 | PI | Nourbakhsh, Norwood, et al., 1991 | LL |
9.4386 | PI | Kutina, Edwards, et al., 1982 | T = 0K; LBLHLM |
9.46 | PE | Kimura, Katsumata, et al., 1981 | LLK |
9.44 | PE | Ogata, Onizuka, et al., 1973 | LLK |
9.44 | PE | Ogata, Onizuka, et al., 1972 | LLK |
9.415 | PE | Kroto and Suffolk, 1972 | LLK |
9.42 | PE | Frost, Herring, et al., 1972 | LLK |
9.44 ± 0.01 | PI | Akopyan, Sergeev, et al., 1970 | RDSH |
9.440 ± 0.005 | PI | Watanabe, Nakayama, et al., 1962 | RDSH |
9.443 ± 0.002 | S | Price, Teegan, et al., 1950 | RDSH |
9.44 | PE | Cradock and Whiteford, 1972 | Vertical value; LLK |
9.44 | PE | Bock, Wagner, et al., 1972 | Vertical value; LLK |
Appearance energy determinations
De-protonation reactions
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 357.6 ± 2.0 | kcal/mol | D-EA | Schwartz, Davico, et al., 2000 | gas phase; B |
ΔrH° | 357.5 ± 2.0 | kcal/mol | D-EA | Moran and Ellison, 1988 | gas phase; B |
ΔrH° | 356.9 ± 2.2 | kcal/mol | G+TS | Bartmess, Scott, et al., 1979 | gas phase; value altered from reference due to change in acidity scale; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 350.6 ± 2.0 | kcal/mol | IMRE | Bartmess, Scott, et al., 1979 | gas phase; value altered from reference due to change in acidity scale; B |
CH3S- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 395.3 ± 2.6 | kcal/mol | G+TS | Kass, Guo, et al., 1990 | gas phase; Acidity between D2O and Me2NH.; B |
ΔrH° | 391.6 ± 7.7 | kcal/mol | D-EA | Kass, Guo, et al., 1990 | gas phase; Between O2 and SO2. Explains bad anchor in McIver Jr. and Fukuda, 1982; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 388.2 ± 2.5 | kcal/mol | IMRB | Kass, Guo, et al., 1990 | gas phase; Acidity between D2O and Me2NH.; B |
Ion clustering data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Mass spectrum (electron ionization), UV/Visible spectrum, Gas Chromatography, 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 as indicated in comments:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
B - John E. Bartmess
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
By formula: CH6N+ + CH4S = (CH6N+ • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.4 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.1 | cal/mol*K | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
By formula: (CH6N+ • C2H3N) + CH4S = (CH6N+ • CH4S • C2H3N)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 9.9 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 20.0 | cal/mol*K | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; M |
By formula: (CH6N+ • 2C2H3N) + CH4S = (CH6N+ • CH4S • 2C2H3N)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 7.8 | kcal/mol | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; Entropy change calculated or estimated; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 20. | cal/mol*K | N/A | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; Entropy change calculated or estimated; M |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
2.4 | 270. | PHPMS | Meot-Ner (Mautner) and Sieck, 1985 | gas phase; Entropy change calculated or estimated; M |
By formula: C2H3O2- + CH4S = (C2H3O2- • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 14.9 ± 1.0 | kcal/mol | TDAs | Meot-ner, 1988 | gas phase; B,M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.8 | cal/mol*K | PHPMS | Meot-ner, 1988 | gas phase; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 8.1 ± 1.0 | kcal/mol | TDAs | Meot-ner, 1988 | gas phase; B |
By formula: Cl- + CH4S = (Cl- • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15.5 ± 3.0 | kcal/mol | IMRB | Staneke, Groothuis, et al., 1995 | gas phase; Chloride affinity comparable to that of CHCl3; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 10.8 ± 3.0 | kcal/mol | IMRB | Staneke, Groothuis, et al., 1995 | gas phase; Chloride affinity comparable to that of CHCl3; B |
By formula: F- + CH4S = (F- • CH4S)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 34.2 ± 2.0 | kcal/mol | IMRE | Larson and McMahon, 1983 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 23.2 | cal/mol*K | N/A | Larson and McMahon, 1983 | gas phase; switching reaction(F-)H2O, Entropy change calculated or estimated; Arshadi, Yamdagni, et al., 1970; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 27.3 ± 2.0 | kcal/mol | IMRE | Larson and McMahon, 1983 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M |
Mass spectrum (electron ionization)
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, UV/Visible spectrum, Gas Chromatography, 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
Spectrum
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Additional Data
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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. |
---|---|
NIST MS number | 86 |
UV/Visible spectrum
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Gas Chromatography, 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.
Spectrum
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Additional Data
View image of digitized spectrum (can be printed in landscape orientation).
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Download spectrum in JCAMP-DX format.
Source | Bol'shakov, et al., 1969 |
---|---|
Owner | INEP CP RAS, NIST OSRD Collection (C) 2007 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
Origin | INSTITUTE OF ENERGY PROBLEMS OF CHEMICAL PHYSICS, RAS |
Source reference | RAS UV No. 20091 |
Instrument | unknown |
Boiling point | 5.9 |
Gas Chromatography
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), UV/Visible spectrum, 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
Kovats' RI, non-polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Packed | SE-30 | 42. | 400. | Rudenko, Mal'tsev, et al., 1985 | Column length: 3. m |
Packed | Squalane | 60. | 401. | Zygmunt and Staszewski, 1981 | Chromosorb W DMCS; Column length: 2. m |
Packed | Squalane | 80. | 401. | Zygmunt and Staszewski, 1981 | Chromosorb W DMCS; Column length: 2. m |
Packed | Squalane | 27. | 393. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 49. | 396. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 67. | 398. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 86. | 401. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Van Den Dool and Kratz RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | HP-5MS | 464. | Bonaiti, Irlinger, et al., 2005 | 30. m/0.25 mm/0.25 μm, He; Program: 5C(8min) => 3C/min => 20C => 10C/min => 150C(10min) |
Capillary | HP-5 | 464. | Engel, Baty, et al., 2002 | 30. m/0.25 mm/0.25 μm, He; Program: 5C(5min) => 3C/min => 20C => 5C/min => 100C 15C/min => 150C (5min) |
Van Den Dool and Kratz RI, polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-Wax | 643. | Wu and Cadwallader, 2002 | 30. m/0.53 mm/1. μm, He, 40. C @ 5. min, 10. K/min, 200. C @ 30. min |
Van Den Dool and Kratz RI, polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Supelcowax-10 | 694. | Majcher and Jelen, 2007 | 30. m/0.25 mm/0.25 μm; Program: 40C(2min) => 40C/min => 60C(2min) => 5C/min => 240C |
Capillary | Supelcowax-10 | 695. | Majcher and Jelén, 2005 | 30. m/0.25 mm/0.25 μm, He; Program: 40C(2min) => 40C/min => 60(2min)C => 5C/min => 240C |
Normal alkane RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-5 | 473. | Cais-Sokolinska, Majcher, et al., 2011 | 25. m/0.20 mm/0.33 μm, Helium, 50. C @ 1. min, 20. K/min; Tend: 240. C |
Capillary | OV-101 | 414. | Zenkevich, 2005 | 25. m/0.20 mm/0.10 μm, N2/He, 6. K/min; Tstart: 50. C; Tend: 250. C |
Capillary | PONA | 414. | Yang, Wang, et al., 2004 | 50. m/0.20 mm/0.50 μm, N2, 2. K/min; Tstart: 35. C; Tend: 170. C |
Capillary | PONA | 460. | Yang, Wang, et al., 2003 | 50. m/0.20 mm/0.50 μm, 2. K/min; Tstart: 30. C; Tend: 150. C |
Capillary | DB-1 | 430. | Hansen, Buttery, et al., 1992 | 30. C @ 25. min, 4. K/min, 200. C @ 20. min; Column length: 60. m; Column diameter: 0.32 mm |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-1 | 444. | Chantreau, Rochat, et al., 2006 | 20. m/0.18 mm/0.18 μm; Program: not specified |
Capillary | PONA | 461. | Yang, Wang, et al., 2003 | 50. m/0.20 mm/0.50 μm; Program: not specified |
Capillary | Polydimethyl siloxanes | 414. | Zenkevich, 1998 | Program: not specified |
Capillary | Polydimethyl siloxanes | 414. | Zenkevich and Chupalov, 1996 | Program: not specified |
Capillary | SPB-1 | 414. | Nedjma and Maujean, 1995 | 30. m/0.32 mm/4. μm, H2; Program: 35(1)-10 -> 55-25 ->250 |
Capillary | DB-1 | 460. | Kawai, Ishida, et al., 1991 | 60. m/0.25 mm/0.25 μm; Program: not specified |
Normal alkane RI, polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | ZB-Wax | 688. | Marin, Pozrl, et al., 2008 | 60. m/0.32 mm/0.50 μm, Helium, 40. C @ 5. min, 4. K/min, 220. C @ 5. min |
Capillary | HP-Innowax | 640. | Senger-Emonnot, Rochard, et al., 2006 | 60. m/0.32 mm/0.5 μm, He, 2. K/min, 220. C @ 10. min; Tstart: 60. C |
Capillary | DB-Wax | 675. | Spadone, Matthey-Doret, et al., 2006 | 60. m/0.25 mm/0.25 μm, Helium, 35. C @ 3. min, 6. K/min, 240. C @ 10. min |
Capillary | TC-Wax | 702. | Ishizaki, Tachihara, et al., 2005 | 60. m/0.25 mm/0.25 μm, N2, 3. K/min, 220. C @ 40. min; Tstart: 70. C |
Capillary | TC-Wax | 700. | Ishikawa, Ito, et al., 2004 | 60. m/0.25 mm/0.5 μm, He, 40. C @ 8. min, 3. K/min; Tend: 230. C |
Capillary | DB-Wax | 690. | Kumazawa and Masuda, 2003 | 60. m/0.25 mm/0.25 μm, He, 3. K/min; Tstart: 40. C; Tend: 210. C |
Capillary | DB-Wax | 696. | Kumazawa and Masuda, 2003 | 30. m/0.25 mm/0.25 μm, He, 3. K/min; Tstart: 40. C; Tend: 210. C |
Capillary | DB-Wax | 655. | Cadwallader and Heo, 2001 | 30. m/0.53 mm/1. μm, He, 40. C @ 5. min, 6. K/min, 225. C @ 30. min |
Capillary | Supelcowax-10 | 668. | Girard and Durance, 2000 | 60. m/0.25 mm/0.25 μm, He, 35. C @ 10. min, 4. K/min; Tend: 200. C |
Capillary | DB-Wax | 679. | Schlüter, Steinhart, et al., 1999 | 60. m/0.32 mm/0.25 μm, He, 34. C @ 3. min, 5. K/min, 200. C @ 10. min |
Capillary | DB-Wax | 699. | Umano, Hagi, et al., 1995 | He, 40. C @ 2. min, 2. K/min; Column length: 60. m; Column diameter: 0.25 mm; Tend: 200. C |
Normal alkane RI, polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | TC-Wax | 702. | Kraft and Switt, 2005 | Program: not specified |
Capillary | TC-Wax | 702. | Tachihara, Ishizaki, et al., 2004 | Program: not specified |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), UV/Visible spectrum, 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.
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Notes
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- Symbols used in this document:
AE Appearance energy Cp,liquid Constant pressure heat capacity of liquid IE (evaluated) Recommended ionization energy Pc Critical pressure S°liquid Entropy of liquid at standard conditions T Temperature Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature d(ln(kH))/d(1/T) Temperature dependence parameter for Henry's Law constant k°H Henry's Law constant at 298.15K ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH(+) ion,0K Enthalpy of formation of positive ion at 0K ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔrS° Entropy of reaction at standard conditions ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions ΔvapS Entropy of vaporization ρc Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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