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

Crespo Paravano, Gaston Adrian; Ghahraman Afshar, Majid; Barrabes Rabanal, Noëlia; Pawlak, Marcin; Bakker, Eric

doi:10.1016/j.electacta.2015.03.180

Scientific article

English

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

Contributors

Crespo Paravano, Gaston Adrian; Ghahraman Afshar, Majid; Barrabes Rabanal, Noëlia; Pawlak, Marcin; Bakker, Eric

Published in

Electrochimica acta, vol. 179, p. 16-23

Publication date

2015

Abstract

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.

Keywords

Ionophore-based membranes
Nitrite
Salophen
Electrically charged ionophore

UNIGE affiliation entities

UNIGE research groups

Groupe Bakker

Citation (ISO format)

CRESPO PARAVANO, Gaston Adrian et al. Characterization of Salophen Co(III) Acetate Ionophore for Nitrite Recognition. In: Electrochimica acta, 2015, vol. 179, p. 16–23. doi: 10.1016/j.electacta.2015.03.180

Article (Published version)

Identifiers

PID : unige:75939
DOI : 10.1016/j.electacta.2015.03.180

Additional URL for this publication

http://linkinghub.elsevier.com/retrieve/pii/S0013468615007999

Journal ISSN

0013-4686

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09/10/2015 14:23:00

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09/10/2015 14:23:00

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14/03/2023 23:41:40

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14/03/2023 23:41:40

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31/10/2024 01:31:00

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

Contributors

Published in

Publication date

Abstract

Keywords

UNIGE affiliation entities

UNIGE research groups

Citation (ISO format)

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Additional URL for this publication

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Creation

First validation

Update

Status update

Last indexation