New thiophene-carbazole-based ligands for efficient singlet to triplet intersystem crossing and triplet to Ln(III) energy transfer

雪城大学化学系Ana de Bettencourt-Dias教授在无机、生物无机和金属有机化学项目的支持下，研究了具有噻吩咔唑主链的新配体体系间交叉的效率与配位到主链上的配体的构象的函数关系。这些配体将被引入到稀土离子络合物中，并将考察这些络合物的稳定性和发射效率。建议的配体将作为有用的稀土离子敏化探针，并将研究其各自的络合物的光化学和光物理性能。这个项目将展示配体的单态和三态如何依赖于它们的化学组成和构象。这些络合物将导致新的镧系发光材料在平板显示器发光二极管中的应用。参与这个项目的本科生将获得研究经验，并学习在彩色显示器领域具有实际应用的化学领域的几种合成技术。研究生将获得配位化学的深入知识，以及在稀土和材料化学方面的应用和研究。最后，上述化合物还可用作储氢和自旋阀、空穴传输层、催化剂和多孔材料的电活性材料的前体。

With the support of the Inorganic, Bioinorganic and Organometallic Chemistry Program, Professor Ana de Bettencourt-Dias, of the Department of Chemistry at Syracuse University to study the efficiency of intersystem crossing of new ligands, which have a thiophene-carbazole-thiophene backbone, as a function of the conformation of the ligand and of the chelating group coordinated to the backbone. These ligands will be incorporated into lanthanide ion complexes and the stabilities and emission efficiencies of these complexes will be examined. The proposed ligands will serve as useful lanthanide ion sensitization probes and their respective complexes will be studied in terms of their photochemical and photophysical perperties. This project will show how the singlet and triplet states of the ligands depend on their chemical composition and conformation. The complexes will lead to new lanthanide-based emmitting materials with application in light-emitting diodes for flat panel displays. Undergraduate students involved in this project will gain research experience and learn several synthetic techniques in an area of chemistry that has practical applications in the field of color displays. Graduate students will acquire in-depth knowledge of coordination chemistry as well as the applications and research done in rare earth and materials chemistry. Finally, the above compounds may also be used as precursors for electroactive materials for hydrogen storage and spin valves, hole transport layers, catalysts and porous materials.