Incorporation of Eu complexes into various organic or inorganic matrixes is one of the acceptable strategies to obtain displaying materials having practical applications. In this work, we report a convenient approach to preparing high luminescent organic–inorganic hybrid materials and films from the europium–titanium oxo-clusters (EuTOCs) having photoactive antenna ligands. Three Eu₂Ti₄ oxo-clusters were synthesized and crystallographically characterized. They are the first reported lanthanide-TOCs coordinated with 1,10-phenanthroline (phen) and 2,2′-bipyridine (bpy) as photoactive ligands, Eu₂Ti₄O₆(phen)₂(pa)₁₀ (1) (pa = propionate), Eu₂Ti₄O₆(bpy)₂(pa)₁₀ (2), and Eu₂Ti₄O₆(phen)₂(MA)₁₀ (3) (MA = methacrylate). Benefitting from the photoactive antenna ligands and the rigid cluster structures, these clusters showed bright red luminescence with quantum yield in the range of 60–80% and long lifetime up to 3.0 ms. Unlike those physically mixed polymeric materials, the MA coordinated compound 3 can be self-polymerized to form a brilliant luminescent film. The film coated slide was used to develop a fluorescence sensor for biomolecule ascorbic acid (AA). The low detection limit and reusable properties suggest great potential for such EuTOC films in real applications.

中文翻译：

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Eu-phen键合的钛氧基团簇，用于方便制备高发光材料和薄膜的前体。

将Eu络合物掺入各种有机或无机基质中是获得具有实际应用的展示材料的可接受策略之一。在这项工作中，我们报告了一种方便的方法，该方法可从具有光敏天线配体的the-钛氧基团簇（EuTOC）制备高发光的有机-无机杂化材料和薄膜。合成了三个Eu ₂ Ti ₄氧簇，并对其晶体学进行了表征。它们是第一个报告的镧系元素-TOCs，与1,10-菲咯啉（phen）和2,2'-联吡啶（bpy）作为光敏配体，Eu ₂ Ti ₄ O ₆（phen）₂（pa）₁₀（1）（pa =丙酸酯），Eu ₂ Ti ₄ O ₆（bpy）₂（pa）₁₀（2）和Eu ₂ Ti ₄ O ₆（phen）₂（MA）₁₀（3）（MA =甲基丙烯酸酯）。得益于光敏天线配体和刚性团簇结构，这些团簇显示出明亮的红色发光，量子产率在60-80％的范围内，使用寿命长达3.0 ms。与那些物理混合的聚合物材料不同，MA配位化合物3可以自聚合形成光亮的发光膜。涂膜的载玻片用于开发生物分子抗坏血酸（AA）的荧光传感器。低检测限和可重复使用的特性表明此类EuTOC膜在实际应用中具有巨大潜力。