Potentiometric anion selectivities of polymer membranes doped with indium(III)‐porphyrins

Abstract

The potentiometric anion responses of polymeric membranes doped with various indium (111)-porphyrin structures are examined. The appropriate membranes are prepared by incorporating 1.0 wt % of the In(II1)-porphyrins in plasticized poly(viny1 chloride) films. When such membranes are incorporated within standard ion selective electrode bodies, the resulting electrodes display non-Hofmeister anion selectivity, with a particularly enhanced and super-Nernstian response to chloride. Among those porphyrins investigated, membranes doped with chloro(octaethylporphyrinato)indium( 111) yield the largest and most reproducible potentiometric anion responses. These same membrane electrodes exhibit negligible response to protons (or hydroxide) in the range of pH 4.5-9.0. When utilized as a flowinjection detector in conjunction with a protein diluenVbuffer stream, the In( 111)-porphyrinbased electrodes may be used to determine chloride levels in human serum samples.

[Tetrakis(4-N,N-dimethylaminobenzene)porphyrinato]-manganese(III) Acetate as a Novel Carrier for a Selective Iodide PVC Membrane Electrode

“…6,33 On the other hand, most of the membranes based on certain metalloporphyrins and iodide solid-state ISE based on the Ag2S + AgI exhibit much higher selectivity for salicylate ion over the target anions. 6,37,38 The data given in Table 2 indicate that the resulting selectivity coefficient of the proposed electrode for Iis very large compared to other anions, such as chloride, bromide, thiocyanate, perchlorate and salicylate, probably due to a specific interaction between the ionophore and the iodide ion, and its low tendency toward common inorganic anions. This surprising phenomenon is probably related to the presence of dimethylamine substitutions for a para situation of the phenyl groups and/or to the influence of the axial ligation of CH3COO -to Mn(III) in the structure of porphyrin.…”

Nitrate-Selective Membrane Electrode Based on Bis(2-hydroxyanil)acetylacetone Lead(II) Neutral Carrier

“…5,25,[27][28][29][30][31][32][33][34][35] These include complexes of different metal ions, such as nickel, tin, indium, aluminum, chromium and manganese with phenanthrolines, salens, salophens, phthalocyanines and porphyrins. In most of the electrodes based on these complexes, axial ligation of the anion to the central metal ion has been mentioned as the reason for the potentiometric response of the electrodes.…”

Synthesis of Azo-functionalized Calix[4]arenes and Its Application to Chloride-selective Electrode as Ionophores

“…Several liquid and polymer membrane-based ISEs have been reported for the analysis of the chloride anion. 3,4 Most of the current ISEs applied to clinical chloride determinations are based on an ion-sensing material of an ion-exchanger type, such as quarternary ammonium salts. [5][6][7] Basically, the selectivity of an ISE based on such as ion-exchanger is ruled by the lipophilicity of the ion.…”

“…In the present study, we describe the fabrication and characterization of new ISEs based on two azo-functionalized calix [4]arenes as neutral ionophores. Calixarene's structures have received considerable attention as interesting classes of an ionic and molecular binding host.…”

“…Calixarene's structures have received considerable attention as interesting classes of an ionic and molecular binding host. 15, 16 Recently we reported that lower rim urea-functionalized calix [4]diquinones show high selectivity as neutral receptors for HSO 4 − , [17][18][19] and as ionophores for HSO 3 − . 20 The urea and thiourea groups have been used in the development of neutral ionophores, because the hydrogen bond donors can provide the anion binding site selectively.…”