MeO anion
- Formula: CH3O-
- Molecular weight: 31.0345
- CAS Registry Number: 3315-60-4
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Reaction thermochemistry data
Go To: Top, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, 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:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
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
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 382. ± 2. | kcal/mol | AVG | N/A | Average of 6 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 376.02 ± 0.62 | kcal/mol | H-TS | Nee, Osterwalder, et al., 2006 | gas phase; B |
ΔrG° | 376.04 ± 0.55 | kcal/mol | H-TS | Osborn, Leahy, et al., 1998 | gas phase; B |
ΔrG° | 374.0 ± 2.0 | kcal/mol | IMRE | Bartmess, Scott, et al., 1979 | gas phase; The acidity is 1.2 kcal/mol stronger than that from the D-EA cycle, due to the multi-compound fit for the acidity scale.; value altered from reference due to change in acidity scale; B |
ΔrG° | 374.6 ± 2.1 | kcal/mol | H-TS | Haas and Harrison, 1993 | gas phase; Both metastable and 50 eV collision energy.; B |
ΔrG° | 375.10 ± 0.60 | kcal/mol | TDEq | Meot-ner and Sieck, 1986 | gas phase; Experimental entropy: 21.5 eu, 0.6 less than H2O; B |
By formula: CH3O- + CH4O = (CH3O- • CH4O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 29.3 ± 1.0 | kcal/mol | TDAs | Paul and Kebarle, 1990 | gas phase; B,M |
ΔrH° | 28.80 ± 0.30 | kcal/mol | TDAs | Meot-ner and Sieck, 1986 | gas phase; B,M |
ΔrH° | 29.4 ± 2.5 | kcal/mol | TDAs | Caldwell, Rozeboom, et al., 1984 | gas phase; Reanchored to average data from Paul and Kebarle, 1990 and Meot-ner and Sieck, 1986.; value altered from reference due to change in acidity scale; B |
ΔrH° | 19.0 ± 2.0 | kcal/mol | N/A | Moylan, Dodd, et al., 1985 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 31.8 | cal/mol*K | PHPMS | Paul and Kebarle, 1990 | gas phase; M |
ΔrS° | 26.7 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 20.30 | kcal/mol | IMRE | Mustanir, Matsuoka, et al., 2006 | gas phase; B |
ΔrG° | 19.8 ± 1.0 | kcal/mol | TDAs | Paul and Kebarle, 1990 | gas phase; B |
ΔrG° | 20.80 ± 0.50 | kcal/mol | TDAs | Meot-ner and Sieck, 1986 | gas phase; B |
ΔrG° | 20.3 ± 1.6 | kcal/mol | TDAs | Caldwell, Rozeboom, et al., 1984 | gas phase; Reanchored to average data from Paul and Kebarle, 1990 and Meot-ner and Sieck, 1986.; value altered from reference due to change in acidity scale; B |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
19.1 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(CH3O-)H2O; Meot-Ner(Mautner), 1986; M |
By formula: CH3O- + H2O = (CH3O- • H2O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 25.3 ± 2.2 | kcal/mol | CIDT | DeTuri and Ervin, 1999 | gas phase; B |
ΔrH° | 23.9 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M,B,M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.9 | cal/mol*K | PHPMS | Meot-ner and Sieck, 1986 | gas phase; M |
ΔrS° | 22.9 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 17.00 ± 0.30 | kcal/mol | TDAs | Meot-ner and Sieck, 1986 | gas phase; B |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
15.4 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(OH-)H2O, DG>; Meot-Ner(Mautner), 1986; M |
(CH3O- • 4294967295) + = CH3O-
By formula: (CH3O- • 4294967295CH2O) + CH2O = CH3O-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 39.90 ± 0.51 | kcal/mol | N/A | Nee, Osterwalder, et al., 2006 | gas phase; B |
ΔrH° | 40.8 ± 1.1 | kcal/mol | Ther | Osborn, Leahy, et al., 1998 | gas phase; B |
ΔrH° | 41.8 ± 2.2 | kcal/mol | Ther | Bartmess, Scott, et al., 1979 | gas phase; The acidity is 1.2 kcal/mol stronger than that from the D-EA cycle, due to the multi-compound fit for the acidity scale.; value altered from reference due to change in acidity scale; B |
By formula: (CH3O- • 2H2O) + H2O = (CH3O- • 3H2O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 14.8 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 24.4 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
7.9 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(OH-)3H2O; Meot-Ner(Mautner), 1986; M |
By formula: (CH3O- • H2O) + H2O = (CH3O- • 2H2O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 19.2 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 25.3 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
8.2 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(OH-)2H2O; Meot-Ner(Mautner), 1986; M |
CH3O- + = C2H4D7O2-
By formula: CH3O- + CD4O = C2H4D7O2-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 28.3 ± 1.0 | kcal/mol | IMRE | Chabinyc and Brauman, 2000 | gas phase; Original dG=19.4 at 350K; dS based on symmetry alone.; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 20.7 ± 1.0 | kcal/mol | IMRE | Chabinyc and Brauman, 2000 | gas phase; Original dG=19.4 at 350K; dS based on symmetry alone.; B |
(CH3O- • • ) + = (CH3O- • 2 • )
By formula: (CH3O- • H2O • CH4O) + H2O = (CH3O- • 2H2O • CH4O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15.2 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 27.7 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • 2CH4O) + H2O = (CH3O- • H2O • 2CH4O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.8 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 25.0 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • CH4O) + H2O = (CH3O- • H2O • CH4O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 17.8 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 25.9 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • 3H2O) + H2O = (CH3O- • 4H2O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 11.0 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 20.0 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
CH3O- + = C2H4F3O-
By formula: CH3O- + CHF3 = C2H4F3O-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 23.5 ± 1.0 | kcal/mol | IMRE | Chabinyc and Brauman, 1998 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 16.6 ± 1.0 | kcal/mol | IMRE | Chabinyc and Brauman, 1998 | gas phase; B |
By formula: (CH3O- • H2O) + CH4O = (CH3O- • CH4O • H2O)
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
13.7 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(CH3O-)2H2O; Meot-Ner(Mautner), 1986; M |
By formula: CH3O- + BF3 = (CH3O- • BF3)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | >22.0 ± 2.0 | kcal/mol | IMRB | Blair, Isolani, et al., 1973 | gas phase; MeOH..MeO- + BF3 ->. Computations indicate dHaff ca. 80 kcal/mol; B |
By formula: (CH3O- • 2CH4O) + CH4O = (CH3O- • 3CH4O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15.0 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 26.3 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • 3CH4O) + CH4O = (CH3O- • 4CH4O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 11.4 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.4 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • CH4O) + CH4O = (CH3O- • 2CH4O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 21.4 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 27.8 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
CH3O- + = C7H8F3OSi-
By formula: CH3O- + C6H5F3Si = C7H8F3OSi-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 76.6 ± 5.9 | kcal/mol | CIDT | Krouse, Lardin, et al., 2003 | gas phase; B |
Gas phase ion energetics data
Go To: Top, Reaction thermochemistry data, Ion clustering data, Vibrational and/or electronic energy levels, 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: John E. Bartmess
Electron affinity of neutral species
EAneutral (eV) | Method | Reference | Comment |
---|---|---|---|
1.5690 ± 0.0019 | LPES | Nee, Osterwalder, et al., 2006 | |
1.5720 ± 0.0040 | LPES | Ramond, Davico, et al., 2000 | |
1.5680 ± 0.0050 | LPES | Osborn, Leahy, et al., 1998 | |
1.685 ± 0.094 | D-EA | Bartmess, Scott, et al., 1979 | The acidity is 1.2 kcal/mol stronger than that from the D-EA cycle, due to the multi-compound fit for the acidity scale.; value altered from reference due to change in acidity scale |
1.570 ± 0.022 | LPES | Engleking, Ellison, et al., 1978 | Confirmed by high level calculations: Hiraoka, Shimizu, et al., 1995 |
1.591 ± 0.040 | PD | Janousek, Zimmerman, et al., 1978 | |
<1.591 ± 0.039 | PD | Reed and Brauman, 1975 | |
2.59998 | EIAE | Tsuda and Hamill, 1964 | From MeOMe |
0.3816 | SI | Page and Goode, 1969 | The Magnetron method, lacking mass analysis, is not considered reliable. |
Protonation reactions
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 382. ± 2. | kcal/mol | AVG | N/A | Average of 6 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 376.02 ± 0.62 | kcal/mol | H-TS | Nee, Osterwalder, et al., 2006 | gas phase |
ΔrG° | 376.04 ± 0.55 | kcal/mol | H-TS | Osborn, Leahy, et al., 1998 | gas phase |
ΔrG° | 374.0 ± 2.0 | kcal/mol | IMRE | Bartmess, Scott, et al., 1979 | gas phase; The acidity is 1.2 kcal/mol stronger than that from the D-EA cycle, due to the multi-compound fit for the acidity scale.; value altered from reference due to change in acidity scale |
ΔrG° | 374.6 ± 2.1 | kcal/mol | H-TS | Haas and Harrison, 1993 | gas phase; Both metastable and 50 eV collision energy. |
ΔrG° | 375.10 ± 0.60 | kcal/mol | TDEq | Meot-ner and Sieck, 1986 | gas phase; Experimental entropy: 21.5 eu, 0.6 less than H2O |
Ion clustering data
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, 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:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
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: CH3O- + BF3 = (CH3O- • BF3)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | >22.0 ± 2.0 | kcal/mol | IMRB | Blair, Isolani, et al., 1973 | gas phase; MeOH..MeO- + BF3 ->. Computations indicate dHaff ca. 80 kcal/mol; B |
CH3O- + = C2H4D7O2-
By formula: CH3O- + CD4O = C2H4D7O2-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 28.3 ± 1.0 | kcal/mol | IMRE | Chabinyc and Brauman, 2000 | gas phase; Original dG=19.4 at 350K; dS based on symmetry alone.; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 20.7 ± 1.0 | kcal/mol | IMRE | Chabinyc and Brauman, 2000 | gas phase; Original dG=19.4 at 350K; dS based on symmetry alone.; B |
CH3O- + = C2H4F3O-
By formula: CH3O- + CHF3 = C2H4F3O-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 23.5 ± 1.0 | kcal/mol | IMRE | Chabinyc and Brauman, 1998 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 16.6 ± 1.0 | kcal/mol | IMRE | Chabinyc and Brauman, 1998 | gas phase; B |
(CH3O- • 4294967295) + = CH3O-
By formula: (CH3O- • 4294967295CH2O) + CH2O = CH3O-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 39.90 ± 0.51 | kcal/mol | N/A | Nee, Osterwalder, et al., 2006 | gas phase; B |
ΔrH° | 40.8 ± 1.1 | kcal/mol | Ther | Osborn, Leahy, et al., 1998 | gas phase; B |
ΔrH° | 41.8 ± 2.2 | kcal/mol | Ther | Bartmess, Scott, et al., 1979 | gas phase; The acidity is 1.2 kcal/mol stronger than that from the D-EA cycle, due to the multi-compound fit for the acidity scale.; value altered from reference due to change in acidity scale; B |
By formula: CH3O- + CH4O = (CH3O- • CH4O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 29.3 ± 1.0 | kcal/mol | TDAs | Paul and Kebarle, 1990 | gas phase; B,M |
ΔrH° | 28.80 ± 0.30 | kcal/mol | TDAs | Meot-ner and Sieck, 1986 | gas phase; B,M |
ΔrH° | 29.4 ± 2.5 | kcal/mol | TDAs | Caldwell, Rozeboom, et al., 1984 | gas phase; Reanchored to average data from Paul and Kebarle, 1990 and Meot-ner and Sieck, 1986.; value altered from reference due to change in acidity scale; B |
ΔrH° | 19.0 ± 2.0 | kcal/mol | N/A | Moylan, Dodd, et al., 1985 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 31.8 | cal/mol*K | PHPMS | Paul and Kebarle, 1990 | gas phase; M |
ΔrS° | 26.7 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 20.30 | kcal/mol | IMRE | Mustanir, Matsuoka, et al., 2006 | gas phase; B |
ΔrG° | 19.8 ± 1.0 | kcal/mol | TDAs | Paul and Kebarle, 1990 | gas phase; B |
ΔrG° | 20.80 ± 0.50 | kcal/mol | TDAs | Meot-ner and Sieck, 1986 | gas phase; B |
ΔrG° | 20.3 ± 1.6 | kcal/mol | TDAs | Caldwell, Rozeboom, et al., 1984 | gas phase; Reanchored to average data from Paul and Kebarle, 1990 and Meot-ner and Sieck, 1986.; value altered from reference due to change in acidity scale; B |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
19.1 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(CH3O-)H2O; Meot-Ner(Mautner), 1986; M |
By formula: (CH3O- • CH4O) + CH4O = (CH3O- • 2CH4O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 21.4 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 27.8 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • 2CH4O) + CH4O = (CH3O- • 3CH4O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15.0 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 26.3 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • 3CH4O) + CH4O = (CH3O- • 4CH4O)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 11.4 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.4 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • CH4O) + H2O = (CH3O- • H2O • CH4O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 17.8 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 25.9 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • 2CH4O) + H2O = (CH3O- • H2O • 2CH4O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 13.8 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 25.0 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
CH3O- + = C7H8F3OSi-
By formula: CH3O- + C6H5F3Si = C7H8F3OSi-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 76.6 ± 5.9 | kcal/mol | CIDT | Krouse, Lardin, et al., 2003 | gas phase; B |
By formula: CH3O- + H2O = (CH3O- • H2O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 25.3 ± 2.2 | kcal/mol | CIDT | DeTuri and Ervin, 1999 | gas phase; B |
ΔrH° | 23.9 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M,B,M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 22.9 | cal/mol*K | PHPMS | Meot-ner and Sieck, 1986 | gas phase; M |
ΔrS° | 22.9 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 17.00 ± 0.30 | kcal/mol | TDAs | Meot-ner and Sieck, 1986 | gas phase; B |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
15.4 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(OH-)H2O, DG>; Meot-Ner(Mautner), 1986; M |
By formula: (CH3O- • H2O) + CH4O = (CH3O- • CH4O • H2O)
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
13.7 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(CH3O-)2H2O; Meot-Ner(Mautner), 1986; M |
(CH3O- • • ) + = (CH3O- • 2 • )
By formula: (CH3O- • H2O • CH4O) + H2O = (CH3O- • 2H2O • CH4O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 15.2 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 27.7 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
By formula: (CH3O- • H2O) + H2O = (CH3O- • 2H2O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 19.2 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 25.3 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
8.2 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(OH-)2H2O; Meot-Ner(Mautner), 1986; M |
By formula: (CH3O- • 2H2O) + H2O = (CH3O- • 3H2O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 14.8 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 24.4 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Free energy of reaction
ΔrG° (kcal/mol) | T (K) | Method | Reference | Comment |
---|---|---|---|---|
7.9 | 296. | FA | MacKay and Bohme, 1978 | gas phase; From thermochemical cycle,switching reaction(OH-)3H2O; Meot-Ner(Mautner), 1986; M |
By formula: (CH3O- • 3H2O) + H2O = (CH3O- • 4H2O)
Bond type: Hydrogen bond (negative ion to hydride)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 11.0 | kcal/mol | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Quantity | Value | Units | Method | Reference | Comment |
ΔrS° | 20.0 | cal/mol*K | PHPMS | Meot-Ner(Mautner), 1986 | gas phase; n; M |
Vibrational and/or electronic energy levels
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, 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: Marilyn E. Jacox
State: ?
Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
---|---|---|---|---|---|---|---|
Td = 12655 ± 15 | gas | Engleking, Ellison, et al., 1978 | |||||
Osborn, Leahy, et al., 1998, 2 | |||||||
Ramond, Davico, et al., 2000, 2 | |||||||
Nee, Osterwalder, et al., 2006 | |||||||
State: X
Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
---|---|---|---|---|---|---|---|
a1 | 3 | 1113 | gas | TPE | Nee, Osterwalder, et al., 2006 | ||
e | 6 | 1120 | gas | TPE | Nee, Osterwalder, et al., 2006 | ||
Additional references: Jacox, 1994, page 242; Jacox, 2003, page 260; Oakes, Harding, et al., 1985
Notes
d | Photodissociation threshold |
References
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Nee, Osterwalder, et al., 2006
Nee, M.J.; Osterwalder, A.; Zhou, J.; Neumark, D.M.,
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Haas, M.J.; Harrison, A.G.,
The Fragmentation of Proton-Bound Cluster Ions and the Gas-Phase Acidities of Alcohols,
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Moylan, C.R.; Dodd, J.A.; Brauman, J.I.,
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Meot-Ner(Mautner), M.,
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Mustanir; Matsuoka, M.; Mishima, M.; Koch, H.,
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Proton-Transfer Reactions in Nitromethane at 297K,
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Blair, Isolani, et al., 1973
Blair, L.K.; Isolani, P.C.; Riveros, J.M.,
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Krouse, I.H.; Lardin, H.A.; Wenthold, P.G.,
Gas-phase ion chemistry and ion thermochemistry of phenyltrifluorosilane,
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Engleking, Ellison, et al., 1978
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Osborn, Leahy, et al., 1998, 2
Osborn, D.L.; Leahy, D.J.; Kim, E.H.; de Beer, E.; Neumark, D.M.,
Photoelectron spectroscopy of CH3O- and CD3O-,
Chem. Phys. Lett., 1998, 292, 4-6, 651, https://doi.org/10.1016/S0009-2614(98)00717-9
. [all data]
Ramond, Davico, et al., 2000, 2
Ramond, T.M.; Davico, G.E.; Schwartz, R.L.; Lineberger, W.C.,
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Oakes, Harding, et al., 1985
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The photoelectron spectroscopy of HO2-,
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Notes
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, References
- Symbols used in this document:
EAneutral Electron affinity of neutral species T Temperature ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔrS° Entropy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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