Anion-selective membrane electrodes based on metalloporphyrins: The influence of lipophilic anionic and cationic sites on potentiometric selectivity

Bakker, Eric; Malinowska, Elżbieta; Schiller, Róbert; Meyerhoff, Mark E.

doi:10.1016/0039-9140(94)e0041-o

Cited by 266 publications

(228 citation statements)

References 17 publications

Supporting

Mentioning

217

Contrasting

Unclassified

Order By: Relevance

“…Anion-selective membranes doped with ionophores that function as charged carriers requires lipophilic anionic site additives (B, in Table 1), while cationic additives (T, in Table 1) are necessary in the case of ionophores that function as neutral carriers. It has been reported that Zr(IV)-porphyrins and other metalloporphyrins are able to function as both charged and neutral carriers [22][23][24][25]. To determine whether this so called "mixedmode" mechanism also exists in the case of new ionophores reported hererin, a series of membranes containing 10 mol% of cationic or anionic additives (relative to ionophore) were prepared (see Table 1).…”

Section: Determination Of Working Mechanism For Ionophores Testedmentioning

confidence: 99%

Polymeric membrane electrodes with improved fluoride selectivity and lifetime based on Zr(IV)- and Al(III)-tetraphenylporphyrin derivatives

Pietrzak

Meyerhoff

Malinowska

2007

Analytica Chimica Acta

Self Cite

View full text Add to dashboard Cite

Novel aluminum(III)-and zirconium(IV)-tetraphenylporhyrin (TPP) derivatives are examined as fluoride selective ionophores for preparing polymer membrane-based ion-selective electrodes (ISEs). The influence of t-butyl-or dichloro-phenyl ring substituents as well as the nature of the metal ion center (Al(III) vs. Zr(IV)) on the anion complexation constants of TPP derivative ionophores are reported. The anion binding stability constants of the ionophores are characterized by the so-called "sandwich membrane" method. All of the metalloporphyrins examined form their strongest anion complexes with fluoride. The influence of plasticizer as well as the type of lipophilic ionic site additive and their amounts in the sensing membrane are discussed. It is shown that membrane electrodes formulated with the metalloporphyrin derivatives and appropriate anionic or cationic additives exhibit enhanced potentiometric response toward fluoride over all other anions tested. Since selectivity toward fluoride is enhanced in the presence of both anionic and cationic additives, the metalloporphyrins can function as either charged or neutral carriers within the organic membrane phase. In contrast to previously reported fluoride-selective polymeric membrane electrodes based on metalloporphyrins, nernstian or near-nernstian (−51.2 to −60.1 mV decade −1 ) as well as rapid (t < 80s) and fully reversible potentiometric fluoride responses are observed. Moreover, use of aluminum (III)-t-butyltetraphenylporphyrin as the ionophore provides fluoride sensors with prolonged (7 months) functional life-time.

show abstract

Section: Determination Of Working Mechanism For Ionophores Testedmentioning

confidence: 99%

Polymeric membrane electrodes with improved fluoride selectivity and lifetime based on Zr(IV)- and Al(III)-tetraphenylporphyrin derivatives

Pietrzak

Meyerhoff

Malinowska

2007

Analytica Chimica Acta

Self Cite

View full text Add to dashboard Cite

show abstract

“…10,[31][32][33] Thus, different aspects of membrane preparation based on Cu(II)4-TVM for Sal -were optimized, the results are given in Table 1. Since in preparation of many PVC membrane-selective electrodes a plasticizer/PVC ratio of 2 will usually result in very suitable performance characteristics, 26 this ratio was kept at about 2 in optimization of the ingredients of the Sal -ion-selective electrodes proposed.…”

Section: Effect Of Membrane Compositionmentioning

confidence: 99%

Salicylate Ion-Selective Electrode Based on New Tetranuclear Copper Complexes of O-Vannlin-methionine as Neutral Carriers

Yuan

Zhou

et al. 2007

ANAL. SCI.

View full text Add to dashboard Cite

“…The presence of lipophilic ionic sites is beneficial for both neutral carrier and charged carrier-based ion-selective electrodes. 21,28 However, for the charged carrier-based ion-selective electrodes, the charge sign of the ionic sites that gives the highest potentiometric selectivities depends on the charge of the ionophore and the charges of the primary and interfering ions as well as on the stoichiometry of their complexes with the ionophore. 29 The plasticizer/PVC ratios of 1.6 -3.5 were examined.…”

Section: The Influence Of Membrane Compositionmentioning

confidence: 99%

Sulfate-selective Electrode Based on a Complex of Copper

et al. 2006

View full text Add to dashboard Cite

Sulfate is a major anion with relevance to industrial chemistry, environmental chemistry including pollution studies, biochemistry and mineralogy, as well as several other areas. The fact that sulfur in several other forms is ultimately determined after conversion to sulfate further enhances the importance of sulfate determination. Acid rain is a very serious problem closely connected with the fast development of industries and economics in the world. In order to clarify and evaluate the effect of acid rain on the acidification of the natural environment, the development of chemical sensors for measuring the primary components of acid rain is important.Among chemical sensors ion-selective electrodes (ISEs) are mainly used for routine applications because they have a number of advantages over other methods of ion determination, such as analysis speed, portability, no sample destruction, and a wide measuring range. The essential property of ISEs is their selectivity, except for cases in which they are employed as detectors in connection with a separation method. In such a case, the best performance does not require selectivity, but only a short response time.Although the majority of the approximately 60 ions for which ionophore based polymeric membrane ion-selective electrodes have been described up to now are cations, 1,2 a series of a new anion-selective electrodes were introduced recently as a result of the growing interest in the host-guest chemistry of anions. [3][4][5] Classical liquid membrane electrodes for anions are based on quaternary ammonium salts and exhibit the Hofmeister selectivity sequence based on the analyte lipophilicity. 6,7 Recently, a series of new anion-selective electrodes has been described, which display a selectivity deviating from the Hofmeister sequence as a result of unique interactions between the carriers and the anions. It has been well documented that the selective complexation of anions by synthetic ionophores can be used to design anion selective electrodes. For sulfate, so far, the most promising ISE is based on a bis(thiourea) derivative that forms four hydrogen bonds in a 1:1 complex with sulfate. 8 Recently, a bis(imidazole) derivative was reported to exhibit a similar selectivity for sulfate with respect to major interferences along with a strong pH dependence. 9 The synthetic hydrotalcite have been used as ionophore for sulfate. 10 For a truly anion-selective electrode, a strong interaction between the ionophore and the anion is required in order to complex the anion in a selective fashion. The potentiometric response of the membranes doped with these complexes is believed to be based on the coordination of analyte anion axial ligand to the metal center of the carrier molecule. 11,12 Recently, we have used ionophores in the construction of ISEs for NO3 -13,14 and SCN -. 15 In the present paper, we report the use of N,N′-bis(2-amino-1-oxo-phenelenyl)phenylenediamine copper(II) as an excellent ionophore for the preparation of a high selective ISE for the potentiometric det...

show abstract

Anion-selective membrane electrodes based on metalloporphyrins: The influence of lipophilic anionic and cationic sites on potentiometric selectivity

Cited by 266 publications

References 17 publications

Polymeric membrane electrodes with improved fluoride selectivity and lifetime based on Zr(IV)- and Al(III)-tetraphenylporphyrin derivatives

Polymeric membrane electrodes with improved fluoride selectivity and lifetime based on Zr(IV)- and Al(III)-tetraphenylporphyrin derivatives

Salicylate Ion-Selective Electrode Based on New Tetranuclear Copper Complexes of O-Vannlin-methionine as Neutral Carriers

Sulfate-selective Electrode Based on a Complex of Copper

Contact Info

Product

Resources

About