Abstract A new europium complex Eu(tta)3L1 (1a) based on 1,10-phenanthroline derivative (L1 = (2-(3,5-dimethoxyphenyl)-1H-imidazo[4,5-f][1,10]phenanthroline), tta = 2-thenoyltrifluoroacetone) was designed and synthesized. Its structure was characterized by 1H and 13C NMR, elemental analysis, UV-vis, fluorescence spectra and single crystal X-ray diffraction. The crystal of the complex 1a belongs to monoclinic system with the space group P21/n. The europium complex 1a in the solid and in the solution displays the typical emission of Eu(III) ion centered at 612 nm as a result of the electric dipole transition (5D0 → 7F2). It exhibits high quantum yield (20.42%), long lifetime (0.29 ms) and good CIE color coordinate (0.67, 0.33) in solid. In addition, the complex shows high sensitivity and selectivity towards Al3+ and Zn2+ in methanol solution which can be attributed to the Al3+/Zn2+ cation instead of Eu3+ in the complex 1a. The LODs for Al3+ and Zn2+ were calculated to be 5.880 × 10−7 and 7.678 × 10−8 mol/L, respectively. Besides, the additions of Al3+ and Zn2+ express remarkable color changes from red to bright blue and ivory that can be clearly observed by the naked eye respectively.

中文翻译：

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基于具有 1,10-菲咯啉配体的新型铕配合物的新型 Al3+ 和 Zn2+ 荧光传感器

摘要 基于 1,10-菲咯啉衍生物的新型铕配合物 Eu(tta)3L1 (1a) (L1 = (2-(3,5-二甲氧基苯基)-1H-imidazo[4,5-f][1,10])菲咯啉), tta = 2-thenoyltrifluoroacetone) 被设计和合成。其结构通过 1H 和 13C NMR、元素分析、UV-vis、荧光光谱和单晶 X 射线衍射表征。配合物1a的晶体属于单斜晶系，空间群为P21/n。由于电偶极跃迁 (5D0 → 7F2)，固体和溶液中的铕络合物 1a 显示出以 612 nm 为中心的 Eu(III) 离子的典型发射。它在固体中表现出高量子产率 (20.42%)、长寿命 (0.29 ms) 和良好的 CIE 色坐标 (0.67, 0.33)。此外，该配合物对甲醇溶液中的 Al3+ 和 Zn2+ 表现出高灵敏度和选择性，这可归因于配合物 1a 中的 Al3+/Zn2+ 阳离子而不是 Eu3+。Al3+ 和 Zn2+ 的 LOD 分别计算为 5.880 × 10-7 和 7.678 × 10-8 mol/L。此外，Al3+和Zn2+的添加表现出显着的颜色变化，从红色到亮蓝色和象牙色，分别可以用肉眼清楚地观察到。