Selective ion pair recognition of citrate and zinc ions in water by ratiometric luminescence signaling

Selective ion pair recognition of citrate and zinc ions in water by ratiometric luminescence signaling
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通过比率发光信号选择性离子对识别水中柠檬酸根和锌离子

DOI:
10.1039/c4ra07894b
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发表时间:
2014
期刊:
RSC Adv.
影响因子:
--
通讯作者:
McMahon B
McMahon B
中科院分区:
--
文献类型:
--
作者:
McMahon B

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明亮的铕 (III) 配合物基于带有烷基亚氨基二乙酸基团的 1,4,7-三氮杂环壬烷环,只有在存在锌 (II) 离子和羧酸根阴离子时才会受到调制,并通过 pH 7.4 下的比率发光分析进行表征。当单独添加金属离子或氧阴离子时,没有观察到发射光谱形式的变化。在所检查的抗磁性系统中,观察到锌和柠檬酸盐的结合最强(log K = 3.9,pH 7.4),并且观察到阴离子选择性的顺序为柠檬酸盐>乳酸盐/乙酸盐/碳酸氢盐。在添加 Ca2+ 或 Mg2+ 离子的情况下,未发现 Eu 光谱特征发生变化,这与这些阳离子对亚氨基二乙酸盐结合位点的亲和力低得多是一致的。
Emission from a bright europium(III) complex, based on a 1,4,7-triazacyclononane ring bearing an alkyliminodiacetate group, is modulated only when in the presence of zinc(II) ions and a carboxylate anion and was characterised by ratiometric luminescence analysis at pH 7.4. No change in emission spectral form was observed when either the metal ion or oxy-anion was added separately. Amongst the diamagnetic systems examined, the strongest binding was observed for zinc and citrate (log K = 3.9, pH 7.4) and anion selectivity was observed in the order citrate > lactate/acetate/bicarbonate. No changes in the Eu spectral characteristics were found in the presence of added Ca2+ or Mg2+ ions, consistent with the much lower affinity of these cations for the iminodiacetate binding site.
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