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首页> 外文期刊>Chemistry: A European journal >Photophysical studies of anion-induced colorimetric response and amplified fluorescence quenching in dipyrrolylquinoxaline-containing conjugated polymers
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Photophysical studies of anion-induced colorimetric response and amplified fluorescence quenching in dipyrrolylquinoxaline-containing conjugated polymers

机译：含二吡咯基喹喔啉的共轭聚合物中阴离子诱导的比色反应和放大的荧光猝灭的光物理研究

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摘要

The dipyrrolylquinoxaline (DPQ)-containing monomer and polymers were synthesized and employed as chromogenic and fluorescent chemosensors for inorganic anions. We have found that in the presence of fluoride or pyrophosphate, the receptors do not form hydrogen bonds between the pyrrole protons and anions. The colorimetric responses and fluorescence quenching in these chemosensors are indeed the result of deprotonation of the N-H proton. The anion selectivity is primarily determined by the relative basicity of anions. The sensitivity of DPQ-based chemosensor was found to display a 34-fold enhancement by incorporation into the conjugated polymer. The anion-induced deprotonation generates low-energy, non-fluorescent trapping sites and is responsible for the signal amplification where the quenching of the excited state occurs from the deprotonated DPQ site in the network by rapid exciton migration along the polymeric backbone.
机译：合成了含二吡咯基喹喔啉（DPQ）的单体和聚合物，并将其用作无机阴离子的生色和荧光化学传感器。我们发现在氟化物或焦磷酸盐的存在下，受体在吡咯质子和阴离子之间不形成氢键。这些化学传感器中的比色响应和荧光猝灭确实是N-H质子去质子化的结果。阴离子的选择性主要取决于阴离子的相对碱性。发现通过掺入共轭聚合物中，基于DPQ的化学传感器的灵敏度显示出34倍的增强。阴离子诱导的去质子化产生低能量，非荧光的捕获位点，并负责信号放大，在该信号放大中，激发态的猝灭是通过网络中通过快速激子沿聚合物主链的迁移从网络中去质子化的DPQ位点发生的。

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