Chromate and dichromate electro-insertion processes into a N,N,N ',N '-tetraoctylphenylenediamine redox liquid

Marken, Frank, Hayman, Colin M. and Bulman Page, Philip C. (2002) Chromate and dichromate electro-insertion processes into a N,N,N ',N '-tetraoctylphenylenediamine redox liquid. Electroanalysis, 14 (3). pp. 172-176. ISSN 1040-0397

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Abstract

Ion transfer processes across aqueous vertical bar organic phase boundaries are of considerable importance in biological and analytical chemistry. When driven by a potential applied to the liquid vertical bar liquid interface the ion transfer may be detected as voltammetric response, Here, a potential applied to the electrode vertical bar aqueous electrolyte vertical bar organic oil (N,N,N',N'-tetraoctylphenylenediamine, TOPD) triple interface is employed to drive anion transfer. Upon oxidation of TOPD deposited in the form of microdroplets onto the electrode and immersed in aqueous media, the transfer of monovalent anions (perchlorate) and divalent anions (sulfate, chromate, dichromate) occurs to maintain charge neutrality in the organic oil phase. Sulfate (0.1 M) as a very hydrophilic anion undergoes transfer into the organic phase at a potential positive of 0.4 V (vs. Ag/AgCl) and may be employed as an 'inert' background electrolyte, Chromate is shown to undergo electro-insertion at low concentrations down to 10 muM. Within the oil phase chromate is undergoing condensation to the more stable dichromate.

Item Type:	Article
Uncontrolled Keywords:	liquid-liquid boundary,dichromate,electrochemistry,electro-insertion,spectroscopy,voltammetry,triple phase,chromate,boundary,oil droplets,microdroplets,voltammetry,surfaces,ion exchange,oxidation
Faculty \ School:	Faculty of Science > School of Chemistry (former - to 2024)
UEA Research Groups:	Faculty of Science > Research Groups > Synthetic Chemistry (former - to 2017) Faculty of Science > Research Groups > Chemistry of Materials and Catalysis
Depositing User:	Rachel Smith
Date Deposited:	21 Jun 2011 10:49
Last Modified:	24 Sep 2024 10:18
URI:	https://ueaeprints.uea.ac.uk/id/eprint/32835
DOI:	10.1002/1521-4109(200202)14:3<172::AID-ELAN172>3.0.CO;2-E

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