Designing water-quenching resistant highly luminescent europium complexes by regulating the orthogonal arrangement of bis-β-diketone ligands
Designing water-quenching resistant highly luminescent europium complexes by regulating the orthogonal arrangement of bis-β-diketone ligands
复制标题
通过调节双-β-二酮配体的正交排列设计耐水淬的高发光铕配合物
DOI：
10.1039/d1dt00155h
复制
发表时间：
2021-06-14
影响因子：
4
通讯作者：
Li, Hongfeng
中科院分区：
文献类型：
--
作者：
Li, Mei;Zhou, Yanyan;Li, Hongfeng
发光的β-二酮基镧系配合物作为化学传感器材料在生物医学应用中得到了很好的探索。在此，开发了三种基于双-β-二酮配体的单核Eu 3+配合物（L-1，L-2和L-3），其可以减少水引起的发光猝灭。配体的特征在于两个β-二酮单元共价结合在衍生蒽的1，8-位（用四氰基乙烯（TCNE）修饰）。X射线晶体学分析表明，它们与Ln（3+）离子以2：1的化学计量比自组装形成单核阴离子配合物[EuL 2]（-），其中两个配体以相互正交的方式与金属中心配位。这种排列方式和TCNE的凸出结构很好地保护了配合物不受第二配位水分子的猝灭作用。光物理性能测试表明，配合物不仅具有较高的发光量子产率（QY = 50-67%），而且具有良好的抗水猝灭能力。
Luminescent beta-diketone-based lanthanide complexes have been well explored as chemical sensor materials for biomedicine applications. Herein, three mononuclear Eu3+ complexes based on bis-beta-diketone ligands (L-1, L-2 and L-3) that can reduce luminescence quenching caused by water were developed. The ligands feature two beta-diketone units covalently bound at the 1,8-position of the derivatized anthracene (modified with tetracyanoethylene, TCNE). X-ray crystallographic analysis reveals that their self-assemblies with Ln(3+) ions in a 2 : 1 stoichiometric ratio form mononuclear anion complexes, [EuL2](-), in which two ligands coordinate to the metal center in a mutually orthogonal manner. This kind of arrangement together with the bulge of TCNE from the anthracene plane well protected the complexes from the quenching effects of water molecules in the second coordination. The photophysical measurements showed that the complexes not only had high luminescence quantum yields (QYs, up to 50-67%) but also presented excellent water-quenching resistant capability.