Strontium-Selective Membrane Electrodes Based on Some Recently Synthesized Benzo-Substituted Macrocyclic Diamides

Abstract

Eight different recently synthesized macrocyclic diamides were studied to characterize their abilities as strontium ion carriers in PVC membrane electrodes. The electrode based on 1,13-diaza-2,3;11,12-dibenzo-4,7,10-trioxacyclopentadecane-14,15-dione exhibits a Nernstian response for Sr(2+) ions over a wide concentration range (1.0 × 10(-)(1)-3.2 × 10(-)(5) M) with a limit of detection of 8.0 × 10(-)(6) M (0.7 ppm). The response time of the sensor is ∼10 s, and the membrane can be used for more than three months without observing any deviation. The electrode revealed comparatively good selectivities with respect to many alkali, alkaline earth, and transition metal ions. It was used as an indicator electrode in potentiometric titration of carbonate ions with a strontium ion solution.

A New PVC-Membrane Electrode Based on a Thia-Substituted Macrocyclic Diamide for Selective Potentiometric Determination of Silver Ion

“…44,51 To assess the selectivity of the proposed silver ion-selective electrode over other cations, M n+ , the methods of fixed interference (FIM) 52 and mixed solution (MSM) 53 were employed as described in our previous publications. 12,13,[28][29][30][31]40 The resulting K Ag,M values for the proposed Ag + ion-selective electrode are summarized in Table 1. As seen, in all cases studied, the selectivity coefficients are in the order of 10 −3 and smaller, emphasizing the highly selective behavior of the proposed membrane electrode for Ag + ion over many other monovalent and divalent cations of vastly different soft-hard character.…”

“…[22][23][24][25] Moreover, the use of some benzo-substituted macrocycles as ion carrier in preparation of PVCbased Li + and Pb 2+ ion-selective electrodes has already been reported in the literature. 26,27 Recently, we have used some new macrocyclic diamide derivatives, synthesized in our laboratories, as suitable neutral ionophores in the construction of PVC-membrane electrodes for Sr 2+ , 28 Zn 2+ , 29 Cu 2+ 30 and Hg 2+ ions. 31 In the present paper, we report the first synthesis of 3,5-diaza-4,5;13,14-dibenzo-21-hydroxy-19-methoxy-9-thia-6,12-dioxabicyclo[15.3.1]heneicosa-1(21),17,19-triene-2,16-dione (I) and its successful use as an excellent neutral ionophore for the preparation of a highly selective and stable plasticized PVC-membrane electrodes for the potentiometric determination of Ag + ion over a wide concentration range.…”

Novel Thallium(I)-Selective Membrane Electrode Based on a Podal Ligand

“…[13][14][15][16][17][18][19][20][21] Thus, several membranes of various plasticizer/PVC/II/ additive ratios were tested and the results are summarized in Table 1.…”

“…[17][18][19] The presence of additives not only improves the response behavior and selectivity, but also may catalyze the exchange kinetics at sample-membrane interface. 20,21 In the present study, we examined NaTPB and KTpCIPB as suitable lipophilic additives in conjunction with ionophore II in the preparation of thallium(I) ion-selective electrode.…”

A New Lead(II)-Selective PVC-Coated Graphite Rod Electrode Based on a Schiff Base Complex

“…Ion-selective electrodes (ISEs) are versatile devices with a wide variety of chemical and medical applications in the analysis of inorganic [1][2][3][4][5][6][7] and organic ions. [8][9][10] The increasing use of ion sensors in the fields of environmental, agriculture, industrial and medicinal analysis is putting more and more pressure on analytical chemists to develop new sensors for fast, accurate, reproducible and selective determination of various species.…”