Synthesis, characterization and fluorescent properties of ferrocenyl pyrazole and triazole ligands and their palladium complexes
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Date
2021
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Journal of Organometallic Chemistry
Abstract
The search for new fluorescent materials with high quantum yields has been the focus of research, con- sidering 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 Pd 2 + 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.
Description
Research Article
Keywords
Ferrocene, Palladium, Pyrazole, Triazole, Fluorescence and quantum yield