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Fluorescence in Lanthanide Coordination Compounds

A special issue of Compounds (ISSN 2673-6918).

Deadline for manuscript submissions: 20 July 2026 | Viewed by 1511

Special Issue Editor


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Guest Editor
1. Department of Chemistry, University of Louisiana at Lafayette, P.O. Box 43700, Lafayette, LA 70504, USA
2. Department of Chemistry, Faculty of Science, Alexandria University, Moharam Bey, Alexandria 21511, Egypt
Interests: bioinorganic chemistry; polynuclear transition metal complexes; lanthanides; fluorescence; molecular magnetism; SMMs and SIMs
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Special Issue Information

Dear Colleagues,

Lanthanide (Ln) complexes have attracted much attention in the last two decades as luminescent devices in the biological fields, such as bio-probes, sensors, and anticancer agents. Trivalent lanthanide ions can form stable complexes with polypeptides, a property that made Lanthanide-binding protein motifs to be extensively used in X-ray crystallography and NMR studies. The electron densities of the Ln(III)-bound peptide compounds and paramagnetic properties facilitate determining the macromolecular structure. Other applications of lanthanide complexes include their use as light devices, solid-state lasers, temperature probes, and in constructing optical signal amplifiers in telecommunication networks. The Ln ion displays coordination numbers ranging from six to twelve in the lanthanide complexes, creating flexible geometrical coordination in the solid state and solutions. The unique electron configuration of Ln3+ ions ([Xe] 4f0-14) and their complexes are known to exhibit narrow and characteristic f–f transitions of luminescent emissions that span from ultraviolet (UV) to visible (Vis) and near-infrared (NIR) regions. The 4f–4f transitions in these complexes are very weak, but this process is enhanced via effective energy transfer from organic ligand chromophores or linker electrons to the central metal ions from which the emission occurs; “photo-antenna effect”. In the molecular design of Ln-complexes, the organic ligand is expected to enhance f-f emission through the energy levels of an acceptor of Ln ion.

This Special Issue of "Fluorescence in Lanthanide Coordination Compounds" in MDPI’s Compounds journal will comprise a selection of regular research papers, short communications or reviews covering various aspects of a multidisciplinary field related to this topic. We warmly invite authors to submit contributions dedicated to this Special Issue.

Prof. Dr. Salah Massoud
Guest Editor

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Keywords

  • lanthanides
  • fluorescence
  • antenna effect

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Published Papers (1 paper)

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Research

20 pages, 5210 KB  
Article
Synthesis, Photophysical Characterization, and Computational Analysis of Novel Bis(oxazolo[5,4-b]pyridine) Derivatives as Terpyridine-Inspired Fluorophores
by Irina V. Palamarchuk, Aida S. Rakhimzhanova, Svetlana S. Volkova, Alexander S. Novikov, Irina A. Pustolaikina and Ivan V. Kulakov
Compounds 2026, 6(1), 12; https://doi.org/10.3390/compounds6010012 - 2 Feb 2026
Viewed by 493
Abstract
Terpyridines are well-known ligands in coordination chemistry, are valued for their conformational flexibility and strong metal-binding properties, and are also of interest as fluorophores. This study focused on the synthesis and comprehensive investigation of a new class of bis-oxazolo[5,4-b]pyridine derivatives, designed based on [...] Read more.
Terpyridines are well-known ligands in coordination chemistry, are valued for their conformational flexibility and strong metal-binding properties, and are also of interest as fluorophores. This study focused on the synthesis and comprehensive investigation of a new class of bis-oxazolo[5,4-b]pyridine derivatives, designed based on their structural similarity to terpyridines. Four novel compounds, 4ad, were synthesized by cyclization of amide derivatives of 3-aminopyridin-2(1H)-ones using pyridine-2,6-dicarboxylic acid and its dichloride as key acidic components. Their structures and purity were confirmed by melting point analysis, high-resolution mass spectrometry, and 1H, 13C NMR spectroscopy. Compounds 4ac exhibit UV absorption at 323–357 nm and intense blue to deep-blue fluorescence (357–474 nm, цi ≈ 0.32–0.84) in chloroform, dichloromethane, and acetonitrile, attributed to p–p* transitions within the conjugated ring system. These findings suggest their potential as phosphors for organic electronics. Computational modeling of 4ac molecules provided insight into their electronic structures, conformational stability, and predicted optical behavior. The most stable conformers (4aII, 4bII, 4cII′) exhibited a progressive decrease in the HOMO–LUMO gap from 4a to 4c, correlated with the enhancement of photoactivity. Among them, compound 4a stands out as the most promising luminophore, displaying the most intense and narrow luminescence band, owing to its high molecular symmetry and stable emission characteristics. Overall, this study lays the foundation for future studies of bis(oxazolo[5,4-b]pyridine) derivatives in coordination chemistry and optoelectronic materials development. Full article
(This article belongs to the Special Issue Fluorescence in Lanthanide Coordination Compounds)
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