Oil|Water Interfacial Phosphate Transfer Facilitated by Boronic Acid: Observation of Unusually Fast Oil|Water Lateral Charge Transport

Meng Li, Grace E. M. Lewis, Tony D. James, Yi-tao Long, Barbara Kasprzyk-hordern, J. M. Mitchels, Frank Marken

Research output: Contribution to journalArticle

11 Citations (Scopus)
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Abstract

Anion transfer for highly hydrophilic phosphate and hydroxide anions into a water-immiscible organic phase, 3-(4-phenylpropyl)-pyridine (or PPP), is driven with the tetraphenylporphyrinato manganese(II/III) (or TPPMn) redox system and facilitated with a hydrophobic oil-based boronic acid ((3-(1,3-dioxo-6-propylamino-1H-benzo[de]isoquinolin-2(3 H)-yl)phenyl)boronic acid). Both 1) experiments with random arrays of microdroplets (transient) and 2) experiments in a gold–gold dual-plate oil-filled microtrench generator-collector configuration (approaching steady state), show that phosphate transfer is facilitated by boronic acid. At pH 7.5 a switch in mechanism occurs from phosphate transfer to hydroxide transfer. Accelerated charge transport is observed lateral to the oil|water interface. Improved boronic acid facilitators and nanotrench electrodes are discussed in terms of future feasibility for phosphate sensing applications.
Original languageEnglish
Pages (from-to)1604-1646
Number of pages43
JournalChemElectroChem
Volume1
Issue number10
Early online date3 Sep 2014
DOIs
Publication statusPublished - 9 Oct 2014

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