Synthesis and characterization of monoazathiacrown ethers as ionophores for polymeric membrane silver-selective electrodes |
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Authors: | Jun Zhang Jiawang Ding Tanji Yin Shunyang Yu |
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Institution: | a Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China b Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China c Graduate University of Chinese Academy of Sciences, Beijing 100049, PR China |
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Abstract: | Nine monoazathiacrown ethers have been synthesized and explored as ionophores for polymeric membrane Ag+-selective electrodes. Potentiometric responses reveal that the ion-selective electrodes (ISEs) based on 2,2′-thiodiethanethiol derivatives can exhibit excellent selectivities toward Ag+. The plasticized poly(vinyl chloride) membrane electrode using 22-membered N2S5-ligand as ionophore has been characterized and its logarithmic selectivity coefficients for Ag+ over most of the interfering cations have been determined as <−8.0. Under optimal conditions, a lower detection limit of 2.2 × 10−10 M can be obtained for the membrane Ag+-ISE. |
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Keywords: | Monoazathiacrown ethers Lower detection limit Silver Ion-selective electrodes |
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