Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China.
State Key Laboratory of Structural Chemistry , Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou , Fujian 350002 , China.
Inorg Chem. 2019 Nov 18;58(22):15008-15012. doi: 10.1021/acs.inorgchem.9b02112. Epub 2019 Nov 5.
A series of lanthanide-titanium oxo clusters (LnTOCs), LnTi-Ac, LnTi--Toluic, and LnTi-Anthra (Ln = Eu and Tb), were prepared based on acetic acid (HAc), -toluic acid (Hp-Toluic), and anthracene-9-carboxylic acid (HAnthra). Crystal structural analysis showed that these clusters possess the same metal topology framework, in which eight Ti ions form a cube and two Ln ions are located on the opposite faces of the cube. The luminescence investigation discovered that the EuTi-Ac displays the highest quantum yields with 15.6%, and the conjugation effect of ligand substituents can lower the triplet state energy of ligands, thus regulating the luminescence quantum yield of the LnTi clusters. These results suggest that the triplet excited-state energy of the ligands should match well with the energy levels of Ln to enhance the luminescence.
一系列镧系钛氧簇（LnTOCs），LnTi-Ac、LnTi--Toluic 和 LnTi-Anthra（Ln = Eu 和 Tb），是基于乙酸（HAc）、-甲苯酸（Hp-Toluic）和蒽-9-羧酸（HAnthra）制备的。晶体结构分析表明，这些簇具有相同的金属拓扑框架，其中八个 Ti 离子形成一个立方体，两个 Ln 离子位于立方体的相对面上。发光研究发现，EuTi-Ac 具有最高的量子产率为 15.6%，配体取代基的共轭效应可以降低配体的三重态能量，从而调节 LnTi 簇的发光量子产率。这些结果表明，配体的三重激发态能量应与 Ln 的能级很好地匹配，以增强发光。
