A high-pressure NMR investigation of reaction chemistries in a simple salt hydrate

Clement R. Yonker; John C. Linehan

doi:10.1016/S0896-8446(03)00089-5

A high-pressure NMR investigation of reaction chemistries in a simple salt hydrate

Clement R. Yonker, John C. Linehan

Pacific Northwest National Laboratory

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Ionic liquids are currently being used in combination with supercritical fluids for catalytic reactions due to the ease of extraction of reaction products by fluids from such bi-phasic systems. In this investigation we report interesting chemistry involving a simple salt hydrate, tetramethylammonium fluoride tetrahydrate, [(CH₃)₄N]F·4H₂O, as a neat melt and dissolved in methanol in contact with supercritical and subcritical CO₂. This hydrate is proposed as a simulant for more complex ionic liquids, to investigate any potential secondary reaction chemistry in these solvent systems with carbon dioxide. Evidence is presented for the formation of methylcarbonate, CH₃O(C=O)O^-, and fluoromethane, CH₃F, in solution when the salt hydrate is in contact with methanol and CO₂.

Original language	English
Pages (from-to)	257-263
Number of pages	7
Journal	Journal of Supercritical Fluids
Volume	29
Issue number	3
DOIs	https://doi.org/10.1016/S0896-8446(03)00089-5
Publication status	Published - May 2004

Keywords

High-pressure NMR
Ionic liquid
Methylcarbonate
Salt hydrate
Supercritical fluids

ASJC Scopus subject areas

Chemical Engineering(all)
Condensed Matter Physics
Physical and Theoretical Chemistry

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title = "A high-pressure NMR investigation of reaction chemistries in a simple salt hydrate",

abstract = "Ionic liquids are currently being used in combination with supercritical fluids for catalytic reactions due to the ease of extraction of reaction products by fluids from such bi-phasic systems. In this investigation we report interesting chemistry involving a simple salt hydrate, tetramethylammonium fluoride tetrahydrate, [(CH3)4N]F·4H2O, as a neat melt and dissolved in methanol in contact with supercritical and subcritical CO2. This hydrate is proposed as a simulant for more complex ionic liquids, to investigate any potential secondary reaction chemistry in these solvent systems with carbon dioxide. Evidence is presented for the formation of methylcarbonate, CH3O(C=O)O-, and fluoromethane, CH3F, in solution when the salt hydrate is in contact with methanol and CO2.",

keywords = "High-pressure NMR, Ionic liquid, Methylcarbonate, Salt hydrate, Supercritical fluids",

author = "Yonker, {Clement R.} and Linehan, {John C.}",

note = "Funding Information: Work at the Pacific Northwest National Laboratory (PNNL) was supported by the Office of Science, Office of Basic Energy Sciences, Chemical Sciences Division of the US Department of Energy, under Contract DE-AC076RLO 1830. ",

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AU - Linehan, John C.

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Y1 - 2004/5

N2 - Ionic liquids are currently being used in combination with supercritical fluids for catalytic reactions due to the ease of extraction of reaction products by fluids from such bi-phasic systems. In this investigation we report interesting chemistry involving a simple salt hydrate, tetramethylammonium fluoride tetrahydrate, [(CH3)4N]F·4H2O, as a neat melt and dissolved in methanol in contact with supercritical and subcritical CO2. This hydrate is proposed as a simulant for more complex ionic liquids, to investigate any potential secondary reaction chemistry in these solvent systems with carbon dioxide. Evidence is presented for the formation of methylcarbonate, CH3O(C=O)O-, and fluoromethane, CH3F, in solution when the salt hydrate is in contact with methanol and CO2.

AB - Ionic liquids are currently being used in combination with supercritical fluids for catalytic reactions due to the ease of extraction of reaction products by fluids from such bi-phasic systems. In this investigation we report interesting chemistry involving a simple salt hydrate, tetramethylammonium fluoride tetrahydrate, [(CH3)4N]F·4H2O, as a neat melt and dissolved in methanol in contact with supercritical and subcritical CO2. This hydrate is proposed as a simulant for more complex ionic liquids, to investigate any potential secondary reaction chemistry in these solvent systems with carbon dioxide. Evidence is presented for the formation of methylcarbonate, CH3O(C=O)O-, and fluoromethane, CH3F, in solution when the salt hydrate is in contact with methanol and CO2.

KW - High-pressure NMR

KW - Ionic liquid

KW - Methylcarbonate

KW - Salt hydrate

KW - Supercritical fluids

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A high-pressure NMR investigation of reaction chemistries in a simple salt hydrate

Abstract

Keywords

ASJC Scopus subject areas

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