Development of Bistable Ionic Liquids

我们成功地合成了一种由钴二（二恶烯烃）络合离子和体积较大的四烷基膦离子结合而成的室温离子液体。电子吸收光谱和静态磁化率的温度依赖性表明，离子液体在室温左右的液体状态下表现出价互变异构平衡。我们还合成了15种pK_a-pK_a′值不同的质子离子液体，发现pk_a′值与瓦尔登产物和溶剂致变色参数密切相关。

We successfully synthesized a room-temperature ionic liquid made by combining a cobalt bis(dioxolene) complex dianion and a bulky tetraalkylphosphonium cation. Temperature denpendences of the electronic absorption spectra and static magnetic susceptibility revealed that the ionic liquid exhibits a valence-tautomeric equilibrium in the liquid state at around room temperature. We also synthesized 15 kinds of protic ionic liquids with different pK_a-pK_a' values, and found that the value intimately relates to the Walden product and solvatochromic parameters.