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Synthesis, characterization and fluorescent properties of ferrocenyl pyrazole and triazole ligands and their palladium complexes
Journal of Organometallic Chemistry ( IF 2.1 ) Pub Date : 2020-12-20 , DOI: 10.1016/j.jorganchem.2020.121664
Cephas Amoah , Collins Obuah , Michael Kojo Ainooson , Alfred Muller

The search for new fluorescent materials with high quantum yields has been the focus of research, considering the diverse applications that fluorescent materials present. In this study, ferrocenyl pyrazolyl (L1) and ferrocenyl triazolyl (L2) ligands and their palladium metal complexes (1 and 2) were synthesized to investigate their fluorescence properties. While the pyrazolyl ligand was prepared through a ligand substitution reaction, synthesis of the triazolyl derivative involved the [3 + 2] azide-alkyne using click chemistry. All the prepared compounds have been characterized by NMR and IR spectroscopy, elemental analysis, mass spectrometry and single-crystal X-ray crystallography. These air-stable compounds were prepared in moderate to good yields (70% and 83%).

The ferrocenyl-pyrazolyl L1 and ferrocenyl-triazolyl L2 ligands showed near-infrared (NIR) emission bands with quantum yields of 20% and 26% respectively. The addition of the Pd2+ ions results in the reduction of fluorescence intensity and quantum yield. Such fluorescent properties demonstrate their potential use in bio-analysis and as fluorogenic probing.



中文翻译:

二茂铁基吡唑和三唑配体及其钯配合物的合成,表征和荧光性质

考虑到荧光材料的各种应用,寻找具有高量子产率的新型荧光材料一直是研究的重点。在这项研究中,二茂铁基吡唑基(L1)和二茂铁基三唑基(L2)配体及其钯金属配合物(12合成)以研究其荧光性质。尽管通过配体取代反应制备了吡唑基配体,但使用点击化学方法合成三唑基衍生物涉及[3 + 2]叠氮化物-炔烃。所有制备的化合物均已通过NMR和IR光谱,元素分析,质谱和单晶X射线晶体学进行了表征。这些空气稳定的化合物以中等至良好的收率(70%和83%)制备。

二茂铁基-吡唑基L1和二茂铁基-三唑基L2配体显示出近红外(NIR)发射带,其量子产率分别为20%和26%。Pd 2+离子的添加​​导致荧光强度和量子产率的降低。此类荧光性质证明了它们在生物分析和荧光探测中的潜在用途。

更新日期:2021-01-10
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