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首页> 外文期刊>Dyes and Pigments >Imidazole-coumarin containing D - A type fluorescent probe: Synthesis photophysical properties and sensing behavior for F- and CN- anion
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Imidazole-coumarin containing D - A type fluorescent probe: Synthesis photophysical properties and sensing behavior for F- and CN- anion

机译：含咪唑 - 香豆素含有D - A型荧光探针：合成光学性性质和F-和CN-阴离子的感测行为

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摘要

A new class of D-A type intramolecular charge transfer (ICT) fluorescent probe, ICU has been designed and synthesized. The solvatochromic behavior, anion interaction and morphological features of the probe have been studied in detail. The molecular probe upon interaction with different class of anions showed good sensitivity for F- and CN- anions in organic medium with high detection limit and rapid response time. The time dependent fluorescence studies suggested about the dynamic and static fluorescence quenching with F- and CN- anions. The scanning electron microscopy (SEM) and diffraction light scattering (DLS) experiments have been performed to understand the morphological behavior and particle size of the probe to distinguish both anions. Upon interaction with F- and CN- the morphology of probe reveals a clear shape reconstruction from the initial aggregated spherical ball shape to fine leaf like and dumbbell like structures, respectively by disaggregation to form minimum energy structures. The photophysical and theoretical (DFT) studies all together suggested about the charge transfer process from imidazole (donor, D) to coumarin (acceptor, A) unit. The probe has been also utilized to detect the anions on test paper strips. The mechanism of interaction between probe and both the anions has been confirmed by (HNMR)-H-1 and HRMS spectral data analysis.
机译：设计和合成了新的D-A型分子内电荷转移（ICT）荧光探针，ICU。已经详细研究了探针的溶溶色的行为，阴离子相互作用和形态学特征。与不同类阴离子相互作用的分子探针对具有高检测极限和快速响应时间的有机介质中的F和CN-阴离子的良好敏感性。依赖于荧光研究的动态和静态荧光猝灭的时间依赖性荧光研究。已经进行了扫描电子显微镜（SEM）和衍射光散射（DLS）实验以了解探针的形态学行为和粒度以区分两个阴离子。在与F-和CN的相互作用时，探针的形态分别通过分解来形成从初始聚集的球形球形状到精细叶片状和哑铃等结构的形状重建，以形成最小能量结构。相同的光物理和理论（DFT）研究均建议从咪唑（供体，D）到香豆素（受体，A）单位的电荷转移过程。探针还用于检测测试纸条上的阴离子。通过（HNMR）-H-1和HRMS光谱数据分析证实了探针与两个阴离子之间的相互作用机制。

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