Highly salicylate-selective membrane electrode based on a new thiomacrocyclic Schiff base complex of binuclear copper(II) as neutral carrier |
| |
Authors: | En-Ping Luo Ya-Qing Chai Jian-Yuan Dai |
| |
Affiliation: | a Chongqing Key Laboratory of Analytical Chemistry, Southwest China Normal University, Chongqing, 400715, China b Teaching-Research Section of Analytical Medicine Chemistry, Guiyang Nursing Vocational College, Guiyang, 550003, China |
| |
Abstract: | New binuclear metallic complexes of thiomacrocyclic Schiff base, 3,9,13,19 -tetraphenyl-6,16-dithione-1,11-dithio-4,5,7,8,14,15,17,18-octaazacycloeicosa-3,8,13,18-tetraene binuclear metal(II) M(II)2-TDDOCT] (M = Cu, Co, Ni), were synthesized and their anion response characteristics were investigated. The performances of the electrodes are considerably influenced by the nature of the central metals. The Cu(II) complex-based electrode exhibited a good selectivity to salicylate anion with an anti-Hofmeister selectivity pattern: Sal− > ClO4− > SCN− > I− > Benzoate > Br− > Acetate > F− > SO32− > NO2− > Cl− > NO3− > SO42− > H2PO4−. The electrode had an excellent linear response to Sal− from 9.0 × 10− 7 to 1.0 × 10− 1 M with a slope of − 59.3 mV per decade,a detection limit of 5.0 × 10− 7 M, and a fast response time within 15 s over the entire concentration series in phosphate buffer solutions of pH 5.0 at 25 °C. Spectroscopic techniques and the influence of lipophilic charged additives on the electrode behavior were used to investigate the response mechanism to Sal−. The electrode can be applied to the direct determination of salicylate in human urine and pharmaceutical samples and the results obtained are in accord with the results from a standard method. |
| |
Keywords: | Salicylate Ion-selective electrode 3 9 13 19-tetraphenyl-6 16-dithione-1 11-dithio-4 5 7 8 14 15 17 18-octaazacycloeicosa-3 8 13 8-tetraene binuclear copper(II) complex Neutral carrier |
本文献已被 ScienceDirect 等数据库收录! |
|