Chen Jing, Xie Ziyu, Meng Lingyi, Hu Ziying, Kuang Xiaofei, Xie Yiming, Lu Can-Zhong
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China.
Fujian Key Laboratory of Photoelectric Functional Materials (Huaqiao University), Xiamen, Fujian 361021, People's Republic of China.
Inorg Chem. 2020 May 18;59(10):6963-6977. doi: 10.1021/acs.inorgchem.0c00392. Epub 2020 May 7.
Single-molecule functional materials with luminescence tunable by external stimuli are of increasing interest due to their application in sensors, display devices, biomarkers, and switches. Herein, new europium and samarium complexes with ligands having triphenylamine () groups as the redox center and 2,2'-bipyridine (bpy) as the coordinating groups and diketonate (tta) as the second ligand have been constructed. The complexes show white-light emission in selected solvents for proper mixtures of the emission from Ln ions and the ligands. Meanwhile, they exhibit reversible luminescence switching on/off properties by controlling the external potential owing to intramolecular energy transfer from the Ln ions to the electrochemically generated radical cation of . Time-dependent density functional theory (TD-DFT) calculations have been performed to study the electronic spectra. The proposed intramolecular energy transfer processes have been verified by density functional theory (DFT) studies.
具有可通过外部刺激调节发光的单分子功能材料因其在传感器、显示设备、生物标志物和开关中的应用而受到越来越多的关注。在此，构建了新的铕和钐配合物，其配体以三苯胺（）基团作为氧化还原中心，2,2'-联吡啶（bpy）作为配位基团，二酮酸酯（tta）作为第二配体。这些配合物在选定的溶剂中，对于来自镧系离子和配体发射的适当混合物显示出白光发射。同时，由于分子内从镧系离子到电化学产生的自由基阳离子的能量转移，它们通过控制外部电势表现出可逆的发光开关开/关特性。已进行含时密度泛函理论（TD-DFT）计算以研究电子光谱。所提出的分子内能量转移过程已通过密度泛函理论（DFT）研究得到验证。
