Unraveling the Origin of Differentiable 'Turn-On' Fluorescence Sensing of Zn2+ and Cd2+ Ions with Squaramides.,ChemPhysChem

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Unraveling the Origin of Differentiable 'Turn-On' Fluorescence Sensing of Zn2+ and Cd2+ Ions with Squaramides.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-06-26 , DOI: 10.1002/cphc.202000332
P Lasitha ₁ , S Dasgupta ₁ , G Naresh Patwari ₁

Affiliation

A squaramide ring conjugated with Schiff‐bases decorated with hydroxy and methoxy functional groups differentially senses zinc and cadmium ions, which turn on the fluorescence. The feebly emitting free ligands light up in the presence of zinc and cadmium acetates, with the acetate ion playing a pivotal role as a conjugate anion. The selective and differentiable emission responses for zinc and cadmium ions make these ligands efficient multi‐analyte sensing agents. Furthermore, these ligands could be used to differentially sense zinc and cadmium ions even in aqueous environments. The NMR investigations reveal marginal differences in the binding of zinc and cadmium ions to the ligands, whereas density functional theory calculations suggest the different extent of ligand‐to‐metal charge transfer (LMCT) contributes to the differential behavior. Finally, comparison of the excited‐state dynamics of free ligand and the metal complexes reveal the appearance of longer lifetime (about 500–700 ps) component with complexation, due to rigidified molecular skeleton, thereby impeding the non‐radiative processes.

中文翻译：

揭示了使用方酸酰胺可分辨的Zn2 +和Cd2 +离子“开启”荧光传感的起源。

与席夫碱共轭的方胺环装饰有羟基和甲氧基官能团，可不同地感应锌和镉离子，从而开启荧光。在乙酸锌和镉的存在下，发射微弱的游离配体发光，乙酸根离子作为共轭阴离子起关键作用。锌和镉离子的选择性和差异发射响应使这些配体成为高效的多分析物传感剂。此外，即使在水性环境中，这些配体也可用于差分感测锌和镉离子。NMR研究表明，锌和镉离子与配体的键合存在边际差异，而密度泛函理论计算表明，配体-金属电荷转移（LMCT）的不同程度也有助于差异行为。最后，

更新日期：2020-06-26

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