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Optoelectronic and biological quantification of semi-conducting, crimson europium chelates with fluorinated β-keto acid and N-donor ancillary ligands

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Abstract

Five luminescent ternary and one binary Europium(III) complexes were synthesised with β-keto acid as primary ligand and neocuproine(neo), 5,6-dimethyl-1,10-phenanthroline(dmph), 4,7-diphenyl-1,10-phenanthroline (batho), 1,10-phenanthroline(phen), 2,2′-bipyridine (bipy) as ancillary ligands, via eco-friendly grinding method and were characterised through elemental analysis, UV–vis and IR spectroscopy, 1H-NMR and 13C-NMR spectroscopy. Their magnificent photophysical properties were studied by PL spectroscopy and numerically analysed by evaluating decay time of luminescence (τ), radiative (Arad), non-radiative transition rate (Anrad), luminescence efficiency (Ƞ) and Judd–Ofelt intensity parameters (Ωλ) for 5D0 → 7F2,4 transitions. The branching ratio of 5D0 → 7F2 transition in complexes (72–77%) makes it a potential laser emission transition. Optimum thermal stability, CIE colour coordinates value in deep red region and colour purity of nearly 90% (complex Eu6) make these complexes a promising candidate for red light emitting display devices. Energy transfer mechanism, optical band gap value and refractive indices were also explored for all complexes. The band gap energy of complexes lies within semiconductor range (2.87–3.83 eV), hence can have utility in lasers and military radars. Antioxidant and antimicrobial properties of all complexes were assessed. Complex Eu4 exhibited excellent antimicrobial activity, even better than standard drug, so the complex can be probed further as potent bactericidal agent.

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Acknowledgements

Savita Khatri, One of the authors, appraises the monetary assistance from Radhakrishnan Foundation, Maharshi Dayanand University, Rohtak, India, in the form of a Minor research project (Award No: DSW/2020/430) to complete this research work.

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Authors and Affiliations

  1. Department of Chemistry, UIET, Maharshi Dayanand University, Rohtak, 124001, India

    Savita Khatri, Pratibha Ahlawat & Rajesh Kumar

  2. Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India

    Pooja Hooda, S. P. Khatkar & V. B. Taxak

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  1. Savita Khatri
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Khatri, S., Hooda, P., Ahlawat, P. et al. Optoelectronic and biological quantification of semi-conducting, crimson europium chelates with fluorinated β-keto acid and N-donor ancillary ligands. Res Chem Intermed 48, 1685–1716 (2022). https://doi.org/10.1007/s11164-022-04658-0

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