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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Selective electrodes for [PF6](-) and [BF4](-) anions based on the associates formed by ionic liquid and cationic
Zhenning Yan1, Yuanchao Pei2, Jing Fan2
1Departerment of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, PR China. yanzzn@zzu.edu.cn
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.
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