A schiff base ligand of coumarin derivative as an ICT-Based fluorescence chemosensor for Al3+
A schiff base ligand of coumarin derivative as an ICT-Based fluorescence chemosensor for Al3+
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DOI：
10.1016/j.snb.2016.08.093
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发表时间：
2017-02-01
影响因子：
8.4
通讯作者：
Singh, Akhilesh Kumar
中科院分区：
文献类型：
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作者：
Hossain, Sayed Muktar;Singh, Kalpana;Singh, Akhilesh Kumar
通过2-羟基-4-甲基苯肼和3-乙酰基香豆素的缩合反应，合成了一种新型的具有ICT特征的香豆素类化学传感器H_2L，该传感器带有取代苯酚的水合带。受体H_2L的荧光光谱表明，该传感器能选择性地识别Al~(3+)，检出限在微摩尔浓度范围内。该受体对Al3+的敏感能力是可逆的。对H_2L的Cu2+络合物进行了结构表征，为H_2L的Al~(3+)络合物的可能结构奠定了基础。基于分子内电荷转移(ICT)、螯合增强荧光(CHEF)和C=N异构化，H_2L的荧光被开启，作为DMF-水混合溶剂中的荧光化学传感器。在存在Al3+的DMF中，受体H_2L的吸收光谱发生显著红移。B3LYP-SCRF/6-31G*密度泛函理论解释了ICT机理。(C)2016爱思唯尔B.V.保留所有权利。
We have developed a novel coumarin-based chemosensor H2L with ICT character bearing the hydra zone of substituted phenol, synthesized by the condensation of 2-hydroxy-4-methylbenzohydrazide with 3-acetylcoumarin. The fluorescence spectra of the receptor H2L demonstrated that the sensor could selectively recognize Al3+ over other metal ions and the detection limit was found in the micromolar concentration range. Sensing capability of the receptor for Al3+ was reversible. Cu2+ complex of H2L was structurally characterized which gave the basis for possible structure of Al3+ complex of H2L. The Turn On fluorescence of H2L is based on intramolecular charge transfer (ICT), chelation enhanced fluorescence (CHEF) and C=N isomerization to serve as fluorescent chemosensor in DMF-water solvent mixture. The receptor H2L showed a remarkably red-shifted absorption spectrum in the presence of Al3+ in DMF. B3LYP-SCRF/6-31G* density functional theory explains the ICT mechanism. (C) 2016 Elsevier B.V. All rights reserved.