Journal
CHEMELECTROCHEM
Volume 1, Issue 10, Pages 1640-1646Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201402181
Keywords
boronic acid; electroanalysis; interfaces; sensors; voltammetry
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Funding
- China Scholarship Council (CSC)
- University of Bath
- NERC
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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(3H)-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 pH7.5 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.
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