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<p>This study presents the synthesis and characterization of five novel europium(III) complexes using 6-fluorochromone-3-carboxyaldehyde as the primary ligand and nitrogen-donor auxiliary ligands such as 5,6-dimethyl-1,10-phenanthroline, 2,2′-bipyridyl, neocuproine, and 1,10-phenanthroline. A detailed analysis of complexes was conducted using various methods, such as elemental analysis, XRD, SEM, EDS mapping, FTIR, NMR, UV-vis and thermal analysis, which verified their structural and compositional properties. XRD analysis shows crystalline structure and average crystalline size was found to be between 35 and 59&#xa0;nm. IR and NMR analyses show that ligand coordinates through oxygen atom of aldehydic, as well as ketonic groups of primary ligand and nitrogen atom of ancillary ligand. The complex remains stable up to 184 ℃. The experimentally measured optical band gaps (2.37–2.76&#xa0;eV) aligned closely with computational estimates (2.37–2.74&#xa0;eV), revealed their potential applications in optoelectronic and semiconductor. The complexes exhibit bright red emissions due to the <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub> transition, with high color purity (up to 96.51%) and quantum efficiency (up to 68.50%). The complexes demonstrated excellent latent fingerprint detection capabilities under UV light, highlighting their potential for forensic diagnostics. Judd-Ofelt parameters and Urbach energy values, suggesting their suitability for laser emission and optoelectronic applications.</p> Graphical Abstract <p></p>

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Synthesis, Photophysical Properties, and Forensic Utility of Novel Eu(III) Complexes

  • 期刊论文

  • 发表日期：

    2026年4月25日

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  • Shagun Goyat,
  • Rajesh Kumar

摘要

This study presents the synthesis and characterization of five novel europium(III) complexes using 6-fluorochromone-3-carboxyaldehyde as the primary ligand and nitrogen-donor auxiliary ligands such as 5,6-dimethyl-1,10-phenanthroline, 2,2′-bipyridyl, neocuproine, and 1,10-phenanthroline. A detailed analysis of complexes was conducted using various methods, such as elemental analysis, XRD, SEM, EDS mapping, FTIR, NMR, UV-vis and thermal analysis, which verified their structural and compositional properties. XRD analysis shows crystalline structure and average crystalline size was found to be between 35 and 59 nm. IR and NMR analyses show that ligand coordinates through oxygen atom of aldehydic, as well as ketonic groups of primary ligand and nitrogen atom of ancillary ligand. The complex remains stable up to 184 ℃. The experimentally measured optical band gaps (2.37–2.76 eV) aligned closely with computational estimates (2.37–2.74 eV), revealed their potential applications in optoelectronic and semiconductor. The complexes exhibit bright red emissions due to the 5D0→7F2 transition, with high color purity (up to 96.51%) and quantum efficiency (up to 68.50%). The complexes demonstrated excellent latent fingerprint detection capabilities under UV light, highlighting their potential for forensic diagnostics. Judd-Ofelt parameters and Urbach energy values, suggesting their suitability for laser emission and optoelectronic applications.

Graphical Abstract