We report synthesis and structure of three new macrocyclic bisindolylmaleimides. The UV spectra of the xylene-bridged compounds4and6show significant differences. A dependence of the absorption properties on the maleimide-indole torsion angles is likely. A first attempt to use induced changes in ring conformation of the more flexible macrocyclic crown ether derivative8to signal the presence of metal cations failed.
我们报道了三种新的大环双吲哚基马来酰亚胺的合成和结构。二甲基苯基桥接化合物4和6的紫外光谱显示出显著差异。吸收性质可能与马来酰亚胺-吲哚扭曲角度有关。首次尝试利用更灵活的大环冠醚衍生物8中诱导的环构象变化来指示金属阳离子的存在失败了。