Triiodide PVC Membrane Electrode Based on a Charge-Transfer Complex of Iodine with 2,4,6,8- Tetraphenyl-2,4,6,8-tetraazabicyclo[3.3.0]octane

Abstract

A novel triiodide ion-selective electrode based on a charge-transfer complex of iodine with 2,4,6,8-tetraphenyl-2,4,6,8-tetraazabicyclo[3.3.0]octane as membrane carrier was prepared. The electrode has a linear dynamic range between 5.0 × 10(-)(2) and 3.5 × 10(-)(6) M, with a near-Nernstian slope of 54.7 ± 0.8 mV decade(-)(1) and a detection limit of 2.0 × 10(-)(6) M. The potentiometric response is independent of the pH of the solution in the pH range 4.0-10.5. The electrode possesses the advantages of low resistance, short conditioning time, fast response, and, especially, very good selectivities over a wide variety of other anions. The electrode can be used for at least 10 months without any considerable divergence in potentials. It was used as an indicator electrode in potentiometric titration of triiodide ions.

Charge-Transfer Triiodide Ion-Selective Electrode Based on 7,16-Dibenzyl-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane

“…DBZDA18C6 (I) and its iodine charge-transfer complex, (DBZDA18C6·I + )I3 -, were prepared as described elsewhere. 22 Doubly distilled deionized water was used throughout. The pH adjustment was made by the addition of 1.0 M HNO3 and NaOH.…”

“…The 1:2 charge-transfer complex between DBZDA18C6 and iodine, formulated as (DBZDA18C6·I + )I3 -, was prepared as described elsewhere 22,23 (see Scheme 1). The resulting (DBZDA18C6·I + )I3 -, solid complex was purified from reagentgrade chloroform, vacuum dried for 48 h and characterized by elemental analysis and UV-Vis spectroscopy.…”

“…Among different anion carriers used for this purpose, 4 the use of metalloporphyrins, [5][6][7][8][9][10] metal complexes, 11,12 and organometalic compounds 13,14 as ionophores in solvent polymeric membrane electrodes are well known to induce potentiometric anion selectivity sequences that differ significantly from the classical Hofmeister pattern. [5][6][7][8][9][10][11][12][13][14] Despite the need for a triiodide ion-selective electrode for the determination of iodide and triiodide ion in many medical, 17,18 juice (as ascorbic acid in orange juice) 20 and environmental samples (such as dissolved O2 in water), [15][16][17][18][19][20][21][22][23] to date there have been limited reports on an I3 -ion-selective electrode in the literature. [17][18][19]22,23 Furthermore, it is interesting to note that, to the best of our knowledge, there is one literature report concerning the use of charge-transfer complexes of crown ethers for preparing an ion-selective electrode.…”

“…[5][6][7][8][9][10][11][12][13][14] Despite the need for a triiodide ion-selective electrode for the determination of iodide and triiodide ion in many medical, 17,18 juice (as ascorbic acid in orange juice) 20 and environmental samples (such as dissolved O2 in water), [15][16][17][18][19][20][21][22][23] to date there have been limited reports on an I3 -ion-selective electrode in the literature. [17][18][19]22,23 Furthermore, it is interesting to note that, to the best of our knowledge, there is one literature report concerning the use of charge-transfer complexes of crown ethers for preparing an ion-selective electrode. 23 In this article, we report on a highly selective PVC-based membrane sensor for the I3 -anion based on a charge-transfer complex between iodine and 7,16-dibenzyl-1,4,10,13-tetraoxa-7,16-diazacyclooctadecan (DBZDA18C6), formulated as (DBZDA18C6·I + )I3 -, as suitable sensing material.…”

Sequential Flow Injection Determination of Chlorine Species Using a Triiodide-selective Electrode Detector

“…24,36 In the present work, we applied this membrane as a triiodide flow-through detector, which enabled the speciation of CAC, TAC, FAC and chlorite to be conducted. Although other triiodide selective electrodes using ionophores [37][38][39][40][41][42][43] have been reported, the blank PVC membrane is preferred due to its simplicity in preparation and its economy.…”