Design, synthesis and photophysical studies of an emissive, europium based, sensor for zinc
作者:Simon J. A. Pope、Rebecca H. Laye
DOI:10.1039/b605837j
日期:——
The synthesis of the probe complex Eu·L and photophysical studies in aqueous media are described. Eu·L is designed to be luminescently responsive to ZnII in the presence of a competitive ionic mixture at pH 7.4. The structure of the complex is based upon a carboxylate functionalised azamacrocycle and possesses a chromophoric bis-picolyl unit for binding ZnII. The effect on both ligand fluorescence and EuIII phosphorescence was investigated in the presence and absence of ZnII. The study revealed that binding ZnII increased the intensity of ligand fluorescence and modulated the inner sphere hydration number of EuIII (q increases from 0 to 2). This modulation in coordination environment induced pronounced changes in the form of the steady state spectra allowing the presence of ZnII to be signalled by both changes in emission intensity and lifetime.
描述了探针配合物Eu·L的合成和水介质中的光物理研究。 Eu·L 设计为在 pH 7.4 的竞争性离子混合物存在下对 ZnII 发光响应。该复合物的结构基于羧酸酯官能化的氮杂大环,并具有用于结合 ZnII 的发色双吡啶甲基单元。研究了存在和不存在 ZnII 时对配体荧光和 EuIII 磷光的影响。研究表明,结合 ZnII 增加了配体荧光强度,并调节了 EuIII 的内球水合数(q 从 0 增加到 2)。配位环境中的这种调制引起了稳态光谱形式的显着变化,允许通过发射强度和寿命的变化来表明 ZnII 的存在。