Potentiometric and spectroscopic characterization of anion selective electrodes based on metal(III) porphyrin ionophores in polyurethane membranes

Malinowska, Elżbieta; Niedziolka, Joanna; Meyerhoff, Mark E.

doi:10.1016/s0003-2670(00)01348-9

Cited by 81 publications

(61 citation statements)

References 46 publications

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“…21, 22, 29 The monohydroxide-bridged dimer of Al[OEP], however, is observed only at relatively high pH-values (pH > 12) (data not shown), indicating that the equilibrium constant for this species is much weaker than the corresponding hydroxide-bridged dimers of Ga(III), In(III), and Zr(IV) porphyrins that are observed in the films even under acidic sample conditions (pH 3). 21,27 The new band at 382 nm is likely dimeric porphyrin species in which two fluorides are bridging the Al(III) centers. Fluoride is already known to serve as a bridging ligand with a variety of metal ions, including aluminum ion.…”

Section: Spectral Properties Of Films Doped With Al[oep]mentioning

confidence: 99%

“…19 Recently it was found that polymer membranes doped with Ga(III) and Zr(IV) porphyrins exhibit an enhanced potentiometric selectivity for fluoride due to the ability of these species to interact selectively with fluoride ion via a preferred axial ligation reaction. [20][21][22][23][24] Further, it appears that the Ga(III) and Zr(IV) porphyrins may be useful for preparing bulk-optode sensing films for fluoride without the need for addition of a suitable pH indicator, owing to the ability of fluoride ion binding to the respective metal ion centers to alter the equilibrium between monomeric porphyrins and hydroxide ion bridged dimeric porphyrins within the polymeric film. 20-23 The dimer and monomeric species have different Soret band λ max for absorption.…”

Section: Introductionmentioning

confidence: 99%

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Fluoride-Selective Optical Sensor Based on Aluminum(III)−Octaethylporphyrin in Thin Polymeric Film: Further Characterization and Practical Application

Badr

Meyerhoff

2005

Anal. Chem.

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More detailed analytical studies of a new fluoride selective optical sensor based on the use of aluminum(III)-octaethylporphyrin and a lipophilic pH indicator (4′,5′-dibromofluorescein octadecyl ester; ETH-7075) within a thin plasticized poly(vinyl chloride) film are reported. The sensor exhibits extraordinary optical selectivity for fluoride over a wide range of other anions, including anions with far more positive free energies of hydration (e.g., perchlorate, thiocyanate, nitrate, etc.). UV-VIS spectrophotometric studies of the sensing films indicate that fluoride interacts with the Al(III) center of the porphyrin structure, yielding both a change in the Soret band λ max of the porphyrin as well as a change in the protonation state of the pH indicator within the film. The same change in spectral properties of the metalloporphyrin occurs in the absence of added pH indicator or with added tetraphenylborate derivative anionic sites, but optical responses to fluoride in these cases are shown to be irreversible. The presence of the pH indicator and the simultaneous fluoride/proton coextraction equilibrium chemistry is shown to greatly enhance the reversibility of fluoride binding to the Al(III) porphyrin. Optical response toward fluoride can be observed in the range of 0.1 μM to 1.6 mM. Optical selectivity coefficients of < 10 −6 for common anions (e.g., sulfate, chloride, nitrate etc.) and < 10 −4 for perchlorate and thiocyanate are obtained. Measurements of fluoride in drinking water via the new optical sensor are shown to correlate well with values obtained for the same samples using a classical LaF 3 based fluoride ion-selective electrode method.

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Section: Spectral Properties Of Films Doped With Al[oep]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluoride-Selective Optical Sensor Based on Aluminum(III)−Octaethylporphyrin in Thin Polymeric Film: Further Characterization and Practical Application

Badr

Meyerhoff

2005

Anal. Chem.

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“…Nitrites, in particular, can react irreversibly with hemoglobin reducing thus blood ability for oxygen transport. Beside the conventional procedures of nitrite determination, an attractive approach consists to investigate the molecular recognition properties of cobalt complexes and to exploit their potentiometric response to nitrite or their electrocatalytic properties towards the oxidation or reduction of nitrite [18,23,26,27]. Consequently, the potential selective recognition properties of the electropolymerized cobalt deuteroporphyrin for the nitrite ions via axial ligation were examined by cyclic voltammetry in the negative region.…”

Section: Capabilities Of the Poly 2 Electrode As Sensor For Nitrite Ionsmentioning

confidence: 99%

A poly(pyrrole-Cobalt(II)deuteroporphyrin) electrode for the potentiometric determination of nitrite

Cosnier

Gondran

Wessel

et al. 2003

Sensors

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Abstract:The electrochemical properties of a new Co(II) deuteroporphyrin substituted by two electropolymerizable pyrrole groups has been investigated in organic solvent. This functionalization has allowed the preparation of the first example of a cobalt deuteroporphyrin film by oxidative electropolymerization. The resulting conducting polypyrrole film exhibits the regular electroactivity of cobalt deuteroporphyrin. Compared to conventional cobalt porphyrin electrochemistry, the replacement of porphyrin macrocycle by deuteroporphyrin ring results in markedly more negative potential values for the metalcentered oxidation and reduction processes. The influence of NO 2 -as axial ligand on the reductive behavior of the electropolymerized cobalt (II) deuteroporphyrin is examined. The recognition properties of the film illustrated by the potentiometric shift of the Co(II)/(I) reduction were exploited for the determination of NO 2 -in the concentration range 2 10 -6 -2.5 10 -4 M.

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“…This seems a near-Hofmeister behavior [37]. It is believed that the presence of ionic sites of opposite charge as the analyte ion (as required for neutral carriers), forces uncomplexed ions to be extracted for electroneutrality reasons, which gives a selectivity sequence that reflects the relative lipophilicity of the sample ions and is not influenced by the complexation with the charged ligand [38].…”

Section: Sensors Selectivitymentioning

confidence: 99%

Sulfadiazine-selective determination in aquaculture environment: Selective potentiometric transduction by neutral or charged ionophores

Almeida

Heitor

Montenegro

et al. 2011

Talanta

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A B S T R A C TSolid-contact sensors for the selective screening of sulfadiazine (SDZ) in aquaculture waters are reported. Sensor surfaces were made from PVC membranes doped with tetraphenylporphyrin-manganese(III) chlo-ride, a-cyclodextrin, 13-cyclodextrin, or 1-cyclodextrin ionophores that were dispersed in plasticizer. Some membranes also presented a positive or a negatively charged additive. Phorphyrin -based sen-sors relied on a charged carrier mechanism. They exhibited a near-Nernstian response with slopes of 52 mV decade −1 and detection limits of 3.91 × 10 −5 mol L −1 . The addition of cationic lipophilic compounds to the membrane originated Nernstian behaviours, with slopes ranging 59.7-62.0 mV decade −1 and wider linear ranges. Cyclodextrin-based sensors acted as neutral carriers. In general, sensors with positively charged additives showed an improved potentiomet ric performance when compared to those without additive. Some SDZ selective membranes displayed higher slopes and extended linear concentration ranges with an increasing amount of additive (always <100% ionophore). The sensors were independent from the pH of test solutions within 2-7. The sensors displayed fast response, always <15 s. In general, a good discriminating ability was found in real sample environment. The sensors were successfully applied to the fast screening of SDZ in real waters samples from aquaculture fish farms. The method offered the advantages of simplicity, accuracy, and automation feasibility. The sensing membrane may contribute to the development of small devices allowing in locus measurements of sulfadiazine or parent-drugs.K e y w o r d s Sulphadiazine, Cyclodextrin-based ionophore, Porphyrin-based ionophore, Sensor, Potentiometry

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Potentiometric and spectroscopic characterization of anion selective electrodes based on metal(III) porphyrin ionophores in polyurethane membranes

Cited by 81 publications

References 46 publications

Fluoride-Selective Optical Sensor Based on Aluminum(III)−Octaethylporphyrin in Thin Polymeric Film: Further Characterization and Practical Application

Fluoride-Selective Optical Sensor Based on Aluminum(III)−Octaethylporphyrin in Thin Polymeric Film: Further Characterization and Practical Application

A poly(pyrrole-Cobalt(II)deuteroporphyrin) electrode for the potentiometric determination of nitrite

Sulfadiazine-selective determination in aquaculture environment: Selective potentiometric transduction by neutral or charged ionophores

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