A fluorophore-anchor dye based on the 4-amino-1,8-naphthalimide chromophore was designed and characterised with respect to its ability of forming supramolecular host–guest complexes with cucurbit[6]uril (CB6) and cucurbit[7]uril (CB7) hosts. It was found that CB6 encapsulates the anchor of the dye with a high binding constant [K = (1.1–1.4) × 107 M− 1], which was independent of acidic or neutral pH
设计了一种基于 4-
氨基-1,8-
萘二甲
酰亚胺发色团的荧光团-锚定
染料,并根据其与葫芦[6]
脲(CB6)和葫芦[7]
脲形成超分子主客体复合物的能力进行了表征。 CB7) 主机。发现 CB6 以高结合常数 [K = (1.1–1.4) × 107 M− 1] 包裹了
染料的锚,这与酸性或中性 pH 条件无关。1:1 结合伴随着荧光猝灭(约 20%)和
染料电荷转移吸收带的红移(Δλ = +22 nm)。这表明在羰基衬里的主体门户和客体
染料的芳香族 NH 基团之间发生了氢键。相比之下,CB7 封装
染料的效率要低得多(K = 4.8 × 104 M− 1)并显示出显着的荧光增强(Φf = 0. 15 对游离
染料和 CB7 络合
染料在 pH 4 时分别为 0.52)。CB7 与芳香族 NH 的氢键的发生不太明显,这是由
染料的电荷转移吸收带的唯一较小红移 (Δλ = +4 nm) 判断的。
染料-CB6 组件具有在生理