Cation complexation and subsequent isomerization of a diaza-18-crown-6 derivative possessing two spirobenzopyran units, crowned bis(spirobenzopyran), were investigated in solution and compared with those of its corresponding derivative incorporating only one spirobenzopyran unit. Complexation of multivalent metal ions, especially Ca2+ and La3+, by crowned bis(spirobenzopyran) enhanced the isomerization of the spirobenzopyran moiety to the corresponding merocyanine form due to the effective intramolecular interaction between a crown-complexed cation and two phenolate anions in the cation complexes of the merocyanine form. Significant photoinduced switching of ionic conductivity was realized in composite films containing crowned bis(spirobenzopyran) and a calcium salt.
研究了具有两个螺并
吡喃单元的重氮-
18-冠-6 衍
生物--冠双(螺并
吡喃)在溶液中的阳离子络合和随后的异构化,并将其与只包含一个螺并
吡喃单元的相应衍
生物进行了比较。冠双(螺苯并
吡喃)与多价
金属离子(尤其是 Ca2+ 和 La3+)的络合增强了螺苯并
吡喃分子向相应美拉尼菁形式的异构化,这是由于在美拉尼菁形式的阳离子络合物中,冠络合阳离子与两个
苯酚阴离子之间存在有效的分子内相互作用。在含有冠双(螺苯并
吡喃)和
钙盐的复合薄膜中,实现了离子电导率的显著光诱导转换。