title: Selective electrodes for [PF6](-) and [BF4](-) anions based on the associates formed by ionic liquid and cationic dyes.
abstract: The feasibility of the newly synthesized ionic associates L1 and L2 formed by ionic liquid [C4mim][PF6] and cationic dyes (malachite green and methylene blue) has been tested as a novel ionophore for the preparation of anion-selective polymeric membrane electrodes. The electrode exhibits Nernstian response and enhanced potentiometric selectivity towards [PF6](-) compared to many other anions. The influence of some experimental parameters such as membrane composition, nature of plasticizer and amount of additive on the potential response of the [PF6](-) sensor are investigated. Under the optimized conditions, the response slopes of the membrane electrodes towards [PF6](-) are 59.7±0.5 and 58.1±0.5 mV/decade based on ionophore L1 and L2, respectively, in 1.0×10(-5)-1.0×10(-1) or 1.0×10(-6)-1.0×10(-1) mol/L concentration range. Interestingly, the optimized electrodes based on ionophores L1 and L2 also exhibit Nernstian response characteristics (60.3±0.5 and 56.0±0.5 mV/decade) for tetrafluoroborate anion [BF4](-) in a wide concentration range. Thus, the proposed sensor has been used for the determination of [PF6](-) and [BF4](-) in aqueous ionic liquids samples and the solubility of the [PF6](-) and [BF4](-) based ionic liquids in water. The satisfactory results are obtained.
authors.affiliation: Departerment of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, PR China. yanzzn@zzu.edu.cn
authors.forename: Zhenning
authors.initials: Z
authors.lastname: Yan
authors.affiliation: School of Chemistry and Environmental Science, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China.
authors.forename: Yuanchao
authors.initials: Y
authors.lastname: Pei
authors.affiliation: School of Chemistry and Environmental Science, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Fan
authors.affiliation: Departerment of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, PR China.
authors.forename: Shuangqiang
authors.initials: S
authors.lastname: Wang
authors.affiliation: School of Chemistry and Environmental Science, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China.
authors.forename: Jianji
authors.initials: J
authors.lastname: Wang
mesh_terms: D000838:Anions / Q000737:chemistry; D001881:Borates; D001888:Boric Acids / Q000032:analysis*; D002412:Cations / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D052578:Ionic Liquids / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*; D017553:Phosphorus Compounds / Q000032:analysis*; D012394:Rosaniline Dyes / Q000737:chemistry*; D012995:Solubility
chemical_list: D000838:Anions; D001881:Borates; D001888:Boric Acids; D002412:Cations; D052578:Ionic Liquids; D017553:Phosphorus Compounds; D012394:Rosaniline Dyes; C005095:malachite green; C098759:fluoroboric acid; D008751:Methylene Blue