一种新型丹酚修饰氮杂环的合成及溶液研究

G. Bergamaschi, A. Miljković, S. Marcheggiani, A. Poggi
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引用次数: 1

摘要

我们报道了一种新的不对称氮杂环体(L1)的合成,其特征是三个对羟基间隔物,其中一个带有丹酚侧臂。荧光传感器在MeOH: water 3:2混合物(0.07 M NaNO3)中进行了电位、紫外-可见和发射研究,特别确定了自由配体的质子化常数和金属离子络合平衡。有趣的是,得到的结果表明,新受体在中性pH下具有荧光,具有典型的丹酚基团发射带。金属的加入引起了丹酚发射带的部分猝灭;这种行为在Cu(II)中更为明显,它使受体的发射减少了60%。在所研究的阳离子中,猝灭发生在双金属络合物的形成之后。对模型化合物L2的类似研究证实,荧光猝灭主要是由静态机制驱动的,这是由于包合物diccopper配合物[L1Cu2]4的形成
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Synthesis and Study in Solution of a New Dansyl-Modified Azacryptand
We report the synthesis of a new asymmetric azacryptand (L1), characterized by three p-xylyl spacers, one of which carries a dansyl side arm. The fluorescent sensor has been studied by potentiometric, UV-Vis, and emission studies in MeOH : water 3 : 2 mixture (0.07 M NaNO3), determining, in particular, the protonation constants of the free ligand and metal ion complexation equilibria. Interestingly, the obtained results revealed that the new receptor is fluorescent at neutral pH with a typical emission band of the dansyl group. Metal addition induced a partial quenching of the dansyl emission band; this behavior is more pronounced with Cu(II) that reduces the receptor’s emission by 60%. With all the studied cations, quenching follows the formation of a dimetallic complex. Similar studies on the model compound L2 confirmed that fluorescence quenching is mainly driven by a static mechanism, attributable to the formation of the inclusion dicopper complex [L1Cu2]4
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