The anion response characteristics of Salicylaldehyde-alanine-imidazole metallic complexes are described.The results show that the electrode based on Salicylaldehyde-alanine-imidazole copper（Ⅱ） [Cu（Ⅱ）-SAI] demon...The anion response characteristics of Salicylaldehyde-alanine-imidazole metallic complexes are described.The results show that the electrode based on Salicylaldehyde-alanine-imidazole copper（Ⅱ） [Cu（Ⅱ）-SAI] demonstrates excellent potentiometric response towards thiocyanate ion and anti-Hofmeister selectivity sequence in following order:SCN->ClO-4>Sal】I->Br->NO-2>NO-3>So-3>Cl->SO2-4>H2PO-4.The electrode shows a near-Nernstian potentiometric response to thiocyanate ion in a wide range of 1.0×10-1-3.0×10-6mol/L with a detection limit 1.0×10-6mol/L and a slope of-55.3 mV/decade in pH 5.0 of phosphate buffer solution at 20℃.The response mechanism is discussed in view of the A.C.impedance technique and the UV spectroscopy technique.The electrode exhibits the advantages of high selectivity,low detection limit,reproducibility and simplicity.The electrode was successfully applied to the determination of thiocyanate ion in waste water and human saliva.展开更多
A new ion selective electrode for salicylate based on N,N＇-（aminoethyl）ethylenediamide bis（2-salicylideneimine） binuclear copper（Ⅱ） complex [Cu（Ⅱ）2-AEBS] as an ionophore was developed. The electrode has a l...A new ion selective electrode for salicylate based on N,N＇-（aminoethyl）ethylenediamide bis（2-salicylideneimine） binuclear copper（Ⅱ） complex [Cu（Ⅱ）2-AEBS] as an ionophore was developed. The electrode has a linear range from 1.0 × 10^-1 to 5.0 ×10^-7 mol·L^- 1 with a near-Nemstian slope of （ - 55 ±1 ） mV/decade and a detection limit of 2.0 × 10-7 mol·L^-1 in phosphorate buffer solution of pH 5.0 at 25 ℃. It shows good selectivity for Sal^- and displays anti-Hofmeister selectivity sequence： Sal^-〉SCN^-〉 ClO4^- 〉I^-〉 NO2^- 〉Br^-〉 NO3^- 〉Cl^-〉 SO3^2- 〉 SO4^2- The proposed sensor based on binuclear copper（Ⅱ）complex has a fast response time of 5-10 s and can be used for at least 2 months without any major deviation. The response mechanism is discussed in view of the alternating current （AC） impedance technique and the UV-vis spectroscopy technique. The effect of the electrode membrane compositions and the experimental conditions were studied. The electrode has been successfully used for the determination of salicylate ion in drug pharmaceutical preparations.展开更多
文摘The anion response characteristics of Salicylaldehyde-alanine-imidazole metallic complexes are described.The results show that the electrode based on Salicylaldehyde-alanine-imidazole copper（Ⅱ） [Cu（Ⅱ）-SAI] demonstrates excellent potentiometric response towards thiocyanate ion and anti-Hofmeister selectivity sequence in following order:SCN->ClO-4>Sal】I->Br->NO-2>NO-3>So-3>Cl->SO2-4>H2PO-4.The electrode shows a near-Nernstian potentiometric response to thiocyanate ion in a wide range of 1.0×10-1-3.0×10-6mol/L with a detection limit 1.0×10-6mol/L and a slope of-55.3 mV/decade in pH 5.0 of phosphate buffer solution at 20℃.The response mechanism is discussed in view of the A.C.impedance technique and the UV spectroscopy technique.The electrode exhibits the advantages of high selectivity,low detection limit,reproducibility and simplicity.The electrode was successfully applied to the determination of thiocyanate ion in waste water and human saliva.
基金Project supported by the National Natural Science Foundation of China （No. 29705001） and the Natural Science Foundation of Chongqing City （Nos. CSTC-2004BB4149 and CSTC-2005BB4100）.
文摘A new ion selective electrode for salicylate based on N,N＇-（aminoethyl）ethylenediamide bis（2-salicylideneimine） binuclear copper（Ⅱ） complex [Cu（Ⅱ）2-AEBS] as an ionophore was developed. The electrode has a linear range from 1.0 × 10^-1 to 5.0 ×10^-7 mol·L^- 1 with a near-Nemstian slope of （ - 55 ±1 ） mV/decade and a detection limit of 2.0 × 10-7 mol·L^-1 in phosphorate buffer solution of pH 5.0 at 25 ℃. It shows good selectivity for Sal^- and displays anti-Hofmeister selectivity sequence： Sal^-〉SCN^-〉 ClO4^- 〉I^-〉 NO2^- 〉Br^-〉 NO3^- 〉Cl^-〉 SO3^2- 〉 SO4^2- The proposed sensor based on binuclear copper（Ⅱ）complex has a fast response time of 5-10 s and can be used for at least 2 months without any major deviation. The response mechanism is discussed in view of the alternating current （AC） impedance technique and the UV-vis spectroscopy technique. The effect of the electrode membrane compositions and the experimental conditions were studied. The electrode has been successfully used for the determination of salicylate ion in drug pharmaceutical preparations.
