Abstract Four red photoluminescent europium(III) complexes have been synthesized by using fluorinated carboxylate ligand, 1-(4-methoxyphenyl)-5-(trifluoromethyl)-1H-pyrazole-4-carboxylic acid as main ligand and bathophenanthroline, 1,10-phenanthroline and 2,2-bipyridyl as auxiliary ligands, through solution precipitation approach. The complexes possess an optimum thermal stability, which is sufficient for organic light emitting diodes fabrication. Under ultraviolet excitation, the complexes display an intense emission peak of europium ion, which makes them a promising red color emitter in display devices. Internal quantum efficiency, color coordinates, Judd–Ofelt parameters, and energy transfer mechanism have been explored. The investigated antimicrobial and antioxidant activity suggest that the synthesized complexes are potent antimicrobial and antioxidant agents. Research Highlights A new ligand L has been synthesized by an ecofriendly method. Four Eu(III) complexes have been synthesized through a facile solution precipitation method by using ligand L and auxiliary ligands. CHN, EDAX, IR, NMR, TG-DTG, DR, UV–vis, and PL spectroscopic techniques and antioxidant analysis are employed. Potential candidate for display devices, laser devices, and antimicrobial agents.

中文翻译：

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含吡唑酸和含氮辅助配体的铕(III)配合物的合成和光致发光分析

摘要 以氟化羧酸配体1-(4-甲氧基苯基)-5-(三氟甲基)-1H-吡唑-4-羧酸为主要配体，红菲咯啉1,10-合成了四种红色光致发光铕(III)配合物。菲咯啉和2,2-联吡啶作为辅助配体，通过溶液沉淀的方法。该配合物具有最佳的热稳定性，足以用于有机发光二极管的制造。在紫外线激发下，配合物显示出强烈的铕离子发射峰，这使它们成为显示设备中很有前途的红色发射器。已经探索了内部量子效率、色坐标、Judd-Ofelt 参数和能量转移机制。研究的抗微生物和抗氧化活性表明合成的复合物是有效的抗微生物和抗氧化剂。研究亮点已通过环保方法合成了一种新的配体 L。通过使用配体 L 和辅助配体，通过简便的溶液沉淀法合成了四种 Eu(III) 配合物。采用 CHN、EDAX、IR、NMR、TG-DTG、DR、UV-vis 和 PL 光谱技术和抗氧化剂分析。显示设备、激光设备和抗菌剂的潜在候选者。采用PL光谱技术和抗氧化剂分析。显示设备、激光设备和抗菌剂的潜在候选者。采用PL光谱技术和抗氧化剂分析。显示设备、激光设备和抗菌剂的潜在候选者。