macrocyclic compounds, benzo[6]urils bearing hydroxymethyl or methyl groups, have been synthesized under mild conditions in high yields. These macrocycles have been employed as hosts to encapsulate bipyridine guests. Fluorescence spectrometric titrations confirmed the formation of interaction complexes in a 1 : 1 ratio and curve-fitting of the decreases in fluorescence intensity of the benzo[6]urils in
新型的大环化合物,带有羟甲基或甲基的苯并[6]基,是在温和条件下以高收率合成的。这些大环化合物已被用作包封联
吡啶客体的宿主。荧光光谱滴定法证实以1:1的比例形成了相互作用的配合物,并且在存在客人的情况下,苯并[6] urils的荧光强度下降的曲线拟合提供了大约1.5×10 3 –1.3的适度缔合常数×10 6 L mol -1。超分子复合物的稳定性被证明既取决于客体的结构又取决于存在于主体上的取代基。主客体相互作用也被探测借助于11 H NMR光谱法,观察到加入客体时苯并[6]
脲的共振的小位移。DFT计算结果表明,苯并[6] urils的包封能力应取决于客体的电子结构。