Polyoxometalates in Imidazolim-based Ionic Liquids: Acceptor Number and Polarity Estimated from Their Voltammetric Behaviour

Hiroki ISHIDA, Shinya AZUMA, Naoki YAMASAKI, Hitomi KURITA, Takuya HASEGAWA, Shuhei OGO, Tadaharu UEDA

研究成果: Article査読

抄録

The selection of an appropriate solvent is essential for achieving high yields and selectivity in chemical reactions. The chemical and physical parameters of organic solvents have been classified into several groups, and solvents can be compared with each other with respect to these properties. The acceptor number (AN), donor number (DN) and polarity (ET N) have been widely accepted and used for theoretically and quantitatively evaluating the properties of organic solvents. In a similar manner, the AN, DN and ET N of room temperature ionic liquids (RTILs) have been estimated from spectral changes in solvatochromic compounds. In this paper, the AN and ET N of eight types of imidazolium-based RTILs were estimated from the relationship between the AN and ET N values and the first redox potential obtained from the voltammograms of polyoxometalates (POMs) in various organic solvents. The obtained parameters were compared with those estimated by spectrophotometric methods reported previously by several groups. This new method for estimating the AN and ET N of RTILs using the voltammetric behaviour of POMs with low charge density and high symmetry could provide the other path to obtain more reliable AN and ET N of RTILs.

本文言語English
ページ(範囲)1131-1137
ページ数7
ジャーナルanalytical sciences
37
8
DOI
出版ステータスPublished - 2021

ASJC Scopus subject areas

  • 分析化学

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