Innovative Multipodal Ligands Derived from Tröger's Bases for the Sensitization of Lanthanide(III) Luminescence.,Chemistry - A European Journal

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Innovative Multipodal Ligands Derived from Tröger's Bases for the Sensitization of Lanthanide(III) Luminescence.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-09-22 , DOI: 10.1002/chem.202003524
Leandro Trupp _{1,

2,

3,

4,

5} , Andrea C Bruttomesso _{3,

4} , Mariana Vardé _{3,

4} , Svetlana V Eliseeva ₅ , Javier A Ramírez _{3,

4} , Stéphane Petoud ₅ , Beatriz C Barja _{1,

2}

Affiliation

Herein, the synthesis and characterization of the first family of multipodal ligands with a Tröger's base framework designed for the preparation of luminescent lanthanide(III) complexes are reported. Eight ligands were designed and synthesized using different strategies, including alkylation reactions, amide couplings, and Ugi multicomponent reactions. All the ligands bear carboxylate groups for the coordination of the lanthanide(III) ions, with the lanthanide(III)‐sensitizing units consisting of the Tröger's base framework itself or attached benzamides. Upon irradiation of the chromophoric ligands, green terbium(III) emission was efficiently generated, whereas europium(III) emission was negligible. The geometry and substitution pattern of the ligands allow control of the stoichiometry of the species formed and the Tb^III luminescence sensitization efficiency, showing that para‐substitution patterns are more efficient than meta substitution for the formation of coordination compounds with lower Tb^III/ligand ratio. We propose that the species formed are self‐assembled 2:2 or 2:4 metallosupramolecular structures.

中文翻译：

源自Tröger基地的创新型多足配体，用于敏化镧系元素（III）发光。

本文中，报道了具有Tröger基本框架的多足配体的第一族的合成和表征，该框架设计用于制备发光镧系元素（III）配合物。使用不同的策略设计和合成了八个配体，包括烷基化反应，酰胺偶联和Ugi多组分反应。所有配体均带有羧酸根基团，用于配合镧系元素（III）离子，以及由Tröger碱骨架本身或连接的苯甲酰胺组成的镧系元素（III）敏化单元。在发色配体的照射下，有效地产生了绿色ter（III）的发射，而euro（III）的发射可以忽略不计。发光敏化效率，表明对位取代模式比元取代更有效地形成具有较低Tb ^III /配体比的配位化合物。我们建议形成的物种是自组装的2：2或2：4的金属超分子结构。

更新日期：2020-09-22

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