title: Keggin-type polyoxometalate-based ionic liquid gels.
abstract: A series of reversible phase transformation ammonium- and phosphonium-based polyoxometalate ionic liquid (POM-IL) gels were synthesized and studied with a focus on the correlation between their physicochemical properties and their chemical structure. The products were successfully characterized by IR, UV, XRD and TG-DTA, and their ionic conductivities were measured. The Keggin-type heteropolyanion clusters decorated with long alkyl chains demonstrated a tendency to exhibit a gel state at room temperature, while all the gels transformed into liquids after heating and then recovered after cooling. With a decrease in the alkyl chain length, a significant improvement in the thermal stability and conductivity of the ammonium-based POM-IL gels can be achieved. Moreover, compared with the corresponding ammonium compound, phosphonium-based POM-IL gel was found to be more stable at high temperature and exhibited better conductivity.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China. qywu@zju.edu.cn.
authors.forename: Tianpei
authors.initials: T
authors.lastname: Huang
authors.forename: Naiqin
authors.initials: N
authors.lastname: Tian
authors.forename: Qingyin
authors.initials: Q
authors.lastname: Wu
authors.forename: Wenfu
authors.initials: W
authors.lastname: Yan