Chemical Engineering Institute, Ural Federal University, 19 Mira St., Yekaterinburg 620002, Russia.
I. Ya. Postovsky Institute of Organic Synthesis of RAS, Ural Division, 22/20 S. Kovalevskoy/Akademicheskaya St., Yekaterinburg 62099, Russia.
Molecules. 2023 Jan 11;28(2):724. doi: 10.3390/molecules28020724.
New Tb(III) and Eu(III) complexes based on aryl-2,2'-bipyridine ligands with a cyclic DO3A chelating unit appended in the alpha position of the bipyridine core were synthesized. The photophysical properties of these complexes were compared with those of complexes of ligands with identical aryl-2,2'-bipyridine chromophores, but with an acyclic DTTA residue as an additional chelating site in the alpha position of the bipyridine core. The nature of the polyaminocarboxylic acid fragments was found to have a significant influence on the luminescence. For some of the Eu(III) complexes, upon the transition from acyclic DTTA- to the cyclic DO3A-appended ligands, a noticeable increase in the intensity of Eu(III) luminescence was observed, with an increase in the quantum yield of up to 2.55 times. In contrast, for most of the Tb(III) complexes, a similar transition resulted in a noticeable decrease in the luminescence intensity of the Tb(III) cation.
合成了新型基于芳基-2,2'-联吡啶配体的 Tb(III)和 Eu(III) 配合物，其中联吡啶核的α位连接了一个环状 DO3A 螯合单元。这些配合物的光物理性质与具有相同芳基-2,2'-联吡啶发色团的配体的配合物进行了比较，但在联吡啶核的α位具有非环状 DTTA 残基作为额外的螯合位点。多氨基羧酸片段的性质被发现对发光有显著影响。对于一些 Eu(III) 配合物，从非环状 DTTA-到环状 DO3A-连接的配体的转变，观察到 Eu(III) 发光强度的显著增加，量子产率增加高达 2.55 倍。相比之下，对于大多数 Tb(III) 配合物，类似的转变导致 Tb(III) 阳离子的发光强度明显降低。
