Boronic acid-facilitated α-hydroxy-carboxylate anion transfer at liquid/liquid electrode systems: the EICrev mechanism

Najoua Katif, Rachel A Harries, Andrew M Kelly, John S Fossey, Tony D James, Frank Marken

Research output: Contribution to journalArticle

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Abstract

The transfer of the alpha-hydroxy-carboxylates of glycolic, lactic, mandelic and gluconic acid from the aqueous electrolyte phase into an organic 4-(3-phenyl-propyl)-pyridine (PPP) phase is studied at a triple-phase boundary electrode system. The tetraphenylporphyrinato complex MnTPP dissolved in PPP is employed to drive the anion transfer reaction and naphthalene-2-boronic acid (NBA) is employed as a facilitator. In the absence of a facilitator, the ability of alpha-hydroxy-carboxylates to transfer into the organic phase improves, consistent with hydrophobicity considerations giving relative transfer potentials (for aqueous 0.1 M solution) of gluconate>glycolate>lactate>mandelate. In the presence of NBA, a shift of the reversible transfer potential to more negative values is indicating fast reversible binding (the mechanism for the electrode process is EICrev) and the binding constants are determined as K-glycolate=2 M-1, K-mandelate=60 M-1, K-lactate=130 M-1 and K-gluconate=2,000 M-1. The surprisingly strong interaction for gluconate is rationalised based on secondary interactions between the gluconate anion and NBA.
LanguageEnglish
Pages1475-1482
Number of pages8
JournalJournal of Solid State Electrochemistry
Volume13
Issue number10
DOIs
StatusPublished - 2009

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Boronic Acids
glycolic acid
carboxylates
Anions
Negative ions
Naphthalene
anions
Electrodes
acids
electrodes
Acids
Liquids
liquids
naphthalene
Pyridine
lactates
Lactic Acid
pyridines
Phase boundaries
Hydrophobicity

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Boronic acid-facilitated α-hydroxy-carboxylate anion transfer at liquid/liquid electrode systems: the EICrev mechanism. / Katif, Najoua; Harries, Rachel A; Kelly, Andrew M; Fossey, John S; James, Tony D; Marken, Frank.

In: Journal of Solid State Electrochemistry, Vol. 13, No. 10, 2009, p. 1475-1482.

Research output: Contribution to journalArticle

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AU - James,Tony D

AU - Marken,Frank

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AB - The transfer of the alpha-hydroxy-carboxylates of glycolic, lactic, mandelic and gluconic acid from the aqueous electrolyte phase into an organic 4-(3-phenyl-propyl)-pyridine (PPP) phase is studied at a triple-phase boundary electrode system. The tetraphenylporphyrinato complex MnTPP dissolved in PPP is employed to drive the anion transfer reaction and naphthalene-2-boronic acid (NBA) is employed as a facilitator. In the absence of a facilitator, the ability of alpha-hydroxy-carboxylates to transfer into the organic phase improves, consistent with hydrophobicity considerations giving relative transfer potentials (for aqueous 0.1 M solution) of gluconate>glycolate>lactate>mandelate. In the presence of NBA, a shift of the reversible transfer potential to more negative values is indicating fast reversible binding (the mechanism for the electrode process is EICrev) and the binding constants are determined as K-glycolate=2 M-1, K-mandelate=60 M-1, K-lactate=130 M-1 and K-gluconate=2,000 M-1. The surprisingly strong interaction for gluconate is rationalised based on secondary interactions between the gluconate anion and NBA.

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