Synthesis and Functions of New Anthracene–Based Ionic Liquids

Shota Hisamitsu1,  Nobuhiro Yanai2,  Nobuo Kimizuka3
1Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 2Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu UniversityDepartment of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 3Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University

Abstract

Ionic liquids (ILs) have attracted much attention in various fields due to their unique physical and chemical properties. Dye–modified ILs are particularly interesting since such ILs enable to fulfill conflicting properties, that is, matrix–free and fluidity. Chromophores densely aggregated without any loss of molecular mobility, and therefore unusual optical and physical properties can be expected. In this presentation, we report the synthesis and functions of novel anthracene–modified ILs. We combined a few kinds of anthracene–based anions with various quaternary ammonium and phosphonium cations, and fully characterized these new ILs by 1H NMR, elemental analysis, DSC, and optical measurements. We observed interesting phase crossover phenomenon in one of these new ILs; photoirradiation upon the IL induced the formation of crystals. Spectroscopic measurements indicated that this unique phenomenon is driven by photodimerization of anthracene. We will also discuss about triplet sensitization and triplet energy migration in our new ILs.