摘要
Despite the similarity of ionic liquid and zwitterion, their some properties such as conductivity and hydrophobicity are different. Here we developed a novel phosphonium salt having a dynamic covalent bond between anion and cation, enabling reversible structural shift between free ion pair and zwitterion. With the phosphonium salt, control of the macroscopic phase behavior in aqueous solution, i.e. forming mono-or biphasic systems, upon exposure to an acid or base was reversibly achieved, based on the structural shift of the phosphonium salt. CO_2/N_2 bubbling reversibly changed the phase behavior as well as acid/base, leading to green separation systems.
Despite the similarity of ionic liquid and zwitterion, their some properties such as conductivity and hydrophobicity are different. Here we developed a novel phosphonium salt having a dynamic covalent bond between anion and cation, enabling reversible structural shift between free ion pair and zwitterion. With the phosphonium salt, control of the macroscopic phase behavior in aqueous solution, i.e. forming mono-or biphasic systems, upon exposure to an acid or base was reversibly achieved, based on the structural shift of the phosphonium salt. CO_2/N_2 bubbling reversibly changed the phase behavior as well as acid/base, leading to green separation systems.
基金
supported in part by the COI program "Construction of next-generation infrastructure using innovative materials–Realization of a safe and secure society that can coexist with the Earth for centuries"
supported by Ministry of Education, Culture, Sports, Science and Technology-Japan (MEXT)
Japan Science and Technology (JST)
the Advanced Low Carbon Technology Research and Development Program (ALCA, No. JPMJAL1104)
the Cross-ministerial Strategic Innovation Promotion Program (SIP) of JST
partly supported by KAKENHI (15K17867 and 18K14281 from the Japan Society for the Promotion of Science)
Leading Initiative for Excellent Young Researchers (from MEXT)
