Simple synthesis of tetra-n-butylphosphonium benzimidazolate/benzimidazole mixture as a thermally stable proton conductor

Yuki Tsuji, Tomonobu Mizumo, Hiroyuki Ohno
2011 Chemical Communications  
Preparation of ionic liquids and mixture with benzimidazole Aqueous solution of [P 4444 ][OH] (a donation from Hokko Chemical) and reagent grade BzIm (Tokyo Chemical Industry Co., Ltd.) were used without further purification. Equimolar amounts of [P 4444 ][OH] and BzIm were mixed slowly in methanol under an atmosphere of nitrogen and stirred on an ice bath, so as to prepare the tetra-n-butylphosphonium benzimidazolate ([P 4444 ][BzIm]) after drying (Scheme 1). A similar process was used to
more » ... re the [P 4444 ][BzIm]/(BzIm) x mixture (x=0.2-3.0) with differing BzIm fractions in order to analyze the proton conductive property. The water content of these mixtures was analysed using a Karl−Fischer moisture titrator (MKS−210, Kyoto Electronics Manufacturing Co.).
doi:10.1039/c0cc03170d pmid:21270974 fatcat:sr7v6uykw5etxb427svidwsaza