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首页> 外文期刊>New Journal of Chemistry >A highly selective fluorescent molecular sensor for potassium based on a calix[4]bisazacrown bearing boron-dipyrromethene fluorophores
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A highly selective fluorescent molecular sensor for potassium based on a calix[4]bisazacrown bearing boron-dipyrromethene fluorophores

机译：基于杯[4]双氮杂ac硼双吡咯亚甲基荧光团的钾的高选择性荧光分子传感器

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摘要

The synthesis of a ditopic fluorescent sensor for cations associating a 1,3 alternate calix[ 4] bisazacrown-5 as an ionophore and substituted boron-dipyrromethene dyes as fluorophores is reported. Photophysical studies revealed that in medium and high polarity solvents an efficient charge transfer (CT) reaction occurs in the excited state leading to a dual emission and a strong quenching of fluorescence. This CT process is either totally suppressed by amino group protonation or hampered by cation complexation; in both cases, a strong fluorescence enhancement is observed. This "switching-on'' of the emission is more pronounced when two cations are coordinated. The stability constants of complexes with sodium, potassium, caesium, calcium and barium cations were measured in acetonitrile and ethanol. The system shows a high sensitivity and selectivity for potassium over other metal ions. A test under physiological conditions was successfully achieved.
机译：据报道，合成了一种用于阳离子的双位荧光传感器，该离子将1,3个交替杯[4] bisazacrown-5作为离子载体，将取代的硼二吡咯亚甲基染料作为荧光团。光物理研究表明，在中等极性和高极性溶剂中，在激发态下会发生有效的电荷转移（CT）反应，从而导致双重发射和强烈的荧光猝灭。这种CT过程要么完全被氨基质子化所抑制，要么被阳离子络合所阻碍。在两种情况下，均观察到强烈的荧光增强。当两个阳离子配位时，这种“发射”现象更加明显，在乙腈和乙醇中测定了钠，钾，铯，钙和钡阳离子与配合物的稳定常数，该系统具有很高的灵敏度和选择性。在其他生理条件下成功地完成了钾的测定。

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