title: Temperature-dependent gel-type ionic liquid compounds based on vanadium-substituted polyoxometalates with Keggin structure.
abstract: A series of temperature-dependent gel-type ionic liquid compounds have been synthesized from 1-(3-sulfonic group) propyl-3-methyl imidazolium (abbreviated as MIMPS) and three vanadium-substituted heteropoly acids H5SiW11VO40, H5SiMo11VO40 and H7SiW9V3O40. The designed and synthesized gel-type polyoxometalate ionic liquids (POM-ILs) have demonstrated a tendency to exhibit a layered structure. Moreover, they can undergo a phase transformation from a viscous gel-state to a liquid-state below 100 °C, and ionic conductivity up to 10(-3) S cm(-1) was observed at 120 °C. Cyclic voltammetry was carried out to study their electrochemical properties in organic solutions, and it was found that the oxidizability of the three POM-ILs decreases in the order: [MIMPS]7SiW9V3O40 > [MIMPS]5SiMo11VO40 > [MIMPS]5SiW11VO40. This result indicates that the redox behavior can be tuned by changing the chemical composition of the heteropolyanions.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China. qywu@zju.edu.cn.
authors.forename: Tianpei
authors.initials: T
authors.lastname: Huang
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China. qywu@zju.edu.cn.
authors.forename: Zhirong
authors.initials: Z
authors.lastname: Xie
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China. qywu@zju.edu.cn.
authors.forename: Qingyin
authors.initials: Q
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, PR China.
authors.forename: Wenfu
authors.initials: W
authors.lastname: Yan