Anion Selectivity of Metalloporphyrins in Membranes

Ammann, D.; Huser, Marin; Kräutler, Bernhard; Rusterholz, Bruno; Schulthess, Peter; Lindemann, Bernhard; Halder, E.; Simon, W.

doi:10.1002/hlca.19860690411

Cited by 124 publications

(63 citation statements)

References 11 publications

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“…The relation between measured absorbance and aLA° can be expressed as Eq. (13) (1 -10~A)2 aLAo f (r) -2 X l0-A qi (13) where A represents the measured absorbance, f (r) is the Kubelka-Munk's factor, and Pis an instrumental factor (14) where aAH and ai°H ? !1'f(r)0 must be satisfied.…”

Section: Resultsmentioning

confidence: 99%

Flow-through Type Chloride Ion Selective Optodes Based on Lipophilic Organometallic Chloride Adducts and a Lipophilic Anionic Dye

et al. 1994

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Flow-through type fiber-optic chloride ion selective optodes have been developed based on chloride adducts of lipophilic organometallic compounds, including a metal: Sn, Ge, Hg or Hf and a lipophilic anionic indicator dye of the Biphenyl amine type. The pellicular-type ODS beads were coated with a lipophilic organic liquid containing the lipophilic organometallic compound as the anion-selective ionophore ligand and LAD-3 as the color changeable indicator dye. The optode system was constructed by packing these color changeable ion sensing beads in the flow-through optical cell (cell volume, 7 µl) having a quartz window attached directly to the distal end of a bifurcated optical fiber . The optode based on tricyclohexyltin chloride (TCTCI) exhibited the most sensitive response to chloride ion among all the sensors using the organometallic compounds investigated. This optode could detect chloride ion in the concentration ranging from 10.4 to l M at pH 6.5 with a 0.01 M sodium phosphate buffer as the flowing solution by measuring the absorbance change in the sensing beads at 516 nm. This optode showed sufficient selectivity for the determination of chloride ion in normal human serum. Several types of optical ion sensors (ion-selective opt(r)odes) based on various neutral ionophores have recently been developed.l-9 Some of these optodes utilize lipophilic ionic indicator dyes which act as counter-ions when neutral ionophores form complexes with the respective analyte ions.2-9 The advantages of these types of optodes have been discussed in detail in recent reviews. 10-12 Not only are these electrodes similar to these ion-selective electrodes (ISEs), but they also have the possibility of higher sensitivity and selectivity compared to these ISEs, in the case where the same ionophore is used for the sensing material.2 In contrast to the cation-selective ionophores, novel anion-selective ionophores (except the classical anion exchangers of quaternary ammonium salts6'8) have been only slightly investigated: the metalloporphyrin derivatives 13,14 macrocyclic polyamine15, and lipophilic organometallic compounds.9,16 Among them, some of the organometals of the cobalt and tin complexes have been used for the ion-sensing materials of the ISE. They show unusual selectivity patterns, different from the so-called Hofmeister sequence that is usually obtained in the case where a classical anion exchanger such as a tetraalkylt To whom correspondence should be addressed .ammonium chloride is used for the anion sensing material for the ISE. Unfortunately, however, most of the electrodes based on these organometal complexes have negative properties for practical use: e.g. slow response, poor reproducibility, etc. Therefore, the electrodes based on a classical anion exchanger of the quaternary ammonium ion type such as the tetraalkylammonium ion have usually been used in the practical measurements of anions in clinical analysis (for chloride ion) and environmental sample measurements, even though the electrode is simply obeying the Hofme...

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Section: Resultsmentioning

confidence: 99%

Flow-through Type Chloride Ion Selective Optodes Based on Lipophilic Organometallic Chloride Adducts and a Lipophilic Anionic Dye

et al. 1994

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“…In the case of ionophores based on different metal ion complex, in addition to the electrostatic interaction between the central metal ion and analyte anions, there is a coordination action between both species involved. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] Thus, the selectivity sequence is dominated by both electrostatic and coordination forces and it is expected that both the nature of the complexed metal ion and the coordination ligand properties play important roles in determining the selectivity of the ionophore towards a specific anion. Recently, there have been a few reports on ionophores that when introduced into solvent polymeric membranes bring about iodide selectivity very divergent from the Hofmeister series.…”

Section: Potential Responses Of the Sensorsmentioning

confidence: 99%

Iodide-selective membrane electrode based on salophen complex of cobalt (III)

Zare¹,

Memarzadeh²,

Gorji³

et al. 2005

J. Braz. Chem. Soc.

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Neste trabalho foi preparado um eletrodo altamente seletivo de membrana de PVC com o complexo cobalto-salofen. O sensor mostra uma seqüência seletiva anti-Hofmeister, com preferência por íons iodeto sobre vários anions comuns. O eletrodo apresentou uma dinâmica linear na faixa de 5,0×10-7 a 1,0×10 -1 mol L -1 , com uma inclinação Nernstiana de -58,9 mV com um limite de detecção de 3,0×10-7 mol L -1 . A região de pH de trabalho do sensor é de 3,1 a 9,8. A leitura rápida é de 15 s, e tem uma vida útil de 2 meses. Os coeficientes de seletividade para o eletrodo proposto foram melhorados para alguns interferentes, se comparado com os eletrodos de membrana de iodeto disponíveis. O eletrodo proposto foi aplicado com sucesso na determinação direta de iodeto em sal comestível e como eletrodo indicador na titulação potenciométrica de I -contra Ag + .A highly selective PVC membrane electrode based on a cobalt-salophen complex was prepared. The sensor displays an anti-Hofmeister selectivity sequence with a preference for iodide ion over many common anions. The electrode has a linear dynamic range between 5.0×10 -7 to 1.0×10 -1 mol L -1 , with a Nernstian slope of -58.9 mV decade -1 and a detection limit of 3.0×10 -7 mol L -1 . The working pH range of the sensor is 3.1-9.8. It exhibits of a fast as 15 s and has a lifetime of about 2 months. The selectivity coefficients for the proposed electrode were improved for some interferences, when compared with those of available iodide membrane electrode. The proposed electrode was successfully applied for the direct determination of iodide in edible salt and as an indicator electrode in potentiometric titration of I -against Ag + .

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“…13,14 The components of the sensor membrane were 2 mg of nitrite ionophore I, 60 µl of ETH 469 and 30 mg of PVC. The materials were dissolved in tetrahydrofuran (about 1 ml) and poured into a flat Petri dish (16 mm diameter), then the solvent was evaporated at room temperature.…”

Section: Electrode Systemmentioning

confidence: 99%

Potentiometric Determination of NAD(P)H Coenzymes Using a Nitrite-Selective Membrane Electrode and a Nitrate Reductase Enzyme and the Application to Glucose Assay in Human Serum

1999

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NAD(P)H coenzyme concentrations were determined with the combination of a nitrite-selective membrane electrode and a nitrate reductase enzyme. The method was based on the detection of nitrite formed by the enzymatic reaction of NAD(P)H with nitrate catalyzed by nitrate reductase. The lower detection limits for both these coenzymes were around 100 µM. This system was applied to detect glucose by combining an additional glucose dehydrogenase enzyme. Serum glucose levels could be determined through the detection of nitrite.

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Anion Selectivity of Metalloporphyrins in Membranes

Cited by 124 publications

References 11 publications

Flow-through Type Chloride Ion Selective Optodes Based on Lipophilic Organometallic Chloride Adducts and a Lipophilic Anionic Dye

Flow-through Type Chloride Ion Selective Optodes Based on Lipophilic Organometallic Chloride Adducts and a Lipophilic Anionic Dye

Iodide-selective membrane electrode based on salophen complex of cobalt (III)

Potentiometric Determination of NAD(P)H Coenzymes Using a Nitrite-Selective Membrane Electrode and a Nitrate Reductase Enzyme and the Application to Glucose Assay in Human Serum

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