Characterization of Salophen Co(III) Acetate Ionophore for Nitrite Recognition

Gaston A Crespo; Majid Ghahraman Afshar; Noelia Barrabes; Marcin Pawlak; Eric Bakker

doi:10.1016/j.electacta.2015.03.180

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Characterization of Salophen Co(III) Acetate Ionophore for Nitrite Recognition

Journal article

Peer reviewed

Characterization of Salophen Co(III) Acetate Ionophore for Nitrite Recognition

Gaston A Crespo, Majid Ghahraman Afshar, Noelia Barrabes, Marcin Pawlak and Eric Bakker

Electrochimica Acta, Vol.179, pp.16-23

2015

DOI: https://doi.org/10.1016/j.electacta.2015.03.180

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Abstract

Chemical Sciences

Engineering

Physical Sciences

ionophore-based membranes

nitrite

salophen

electrically charged ionophore

The ionophore (salph)Co(III)OAc is used here for the first time as a recognition molecule for nitrite in lipophilic membranes. The nature of the recognition process is evaluated by UV-Vis, ATR-IR and potentiometry, while the purity of the compound is confirmed by LC-MS and cyclic voltammetry. Experimental evidence suggests a replacement of the acetate ligand by nitrite. The formation constant between (salph)Co(III)OAc and NO2-, β∼108, is estimated potentiometrically with the sandwich membrane method. The analytical parameters, LOD∼3 μM, linear range of four orders of magnitude, stability over four days, and the selectivity over chloride (log KNO2,ClPOT∼-4.1) are similar to previous ionophores for the same ion. Undiluted urine samples were spiked with incremental concentrations of nitrite to characterize the matrix effect. Beyond the observed analytical performance, we aim here to offer a rational study to understand an unconventional charged ionophore recognition process.

Details

Title: Characterization of Salophen Co(III) Acetate Ionophore for Nitrite Recognition
Authors: Gaston A Crespo (Author) - University of Geneva, Switzerland
Majid Ghahraman Afshar (Author) - University of Geneva, Switzerland
Noelia Barrabes (Author) - University of Geneva, Switzerland
Marcin Pawlak (Author) - University of Geneva, Switzerland
Eric Bakker (Author) - University of Geneva, Switzerland
Publication details: Electrochimica Acta, Vol.179, pp.16-23
Publisher: Pergamon
Date published: 2015
DOI: 10.1016/j.electacta.2015.03.180
ISSN: 0013-4686
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449157002621
Output Type: Journal article

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