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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Luminescent Supramolecular Metallogels: Drug Loading and Eu(III) as Structural Probe.

Rafael V M Freire1, Dhiego M A Coelho1, Larissa G Maciel1

  • 1Department of Fundamental Chemistry, Federal University of Pernambuco, Cidade Universitária, 50740-560, Recife, Brazil.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 9, 2024
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Summary

This study develops luminescent hydrogels using europium (Eu(III)) and iminodiacetic acid (IDA). These tunable materials show potential for 3D printing and drug delivery, with Eu(III) luminescence aiding structural analysis.

Keywords:
Computational chemistryDrug deliveryGelsLanthanidesLuminescence

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Coordination chemistry

Background:

  • Supramolecular metallogels integrate gel properties with metal ion functionalities.
  • Lanthanide ions, like europium (Eu(III)), offer unique luminescent characteristics valuable for advanced materials.
  • Luminescent hydrogels are of interest for applications requiring both structural integrity and optical properties.

Purpose of the Study:

  • To synthesize and characterize novel luminescent hydrogels based on Eu(III) and iminodiacetic acid (IDA).
  • To investigate the influence of metal:ligand ratios on the rheological properties of Eu(III)-IDA hydrogels.
  • To utilize Eu(III) luminescence and computational methods for structural elucidation of the metallogels.
  • To explore the potential of these hydrogels for loading and delivering bioactive molecules.

Main Methods:

  • Synthesis of Eu(III)-IDA hydrogels with varying metal:ligand ratios.
  • Rheological property measurements to assess gel characteristics.
  • Eu(III) luminescence spectroscopy for chemical structure analysis.
  • Computational modeling to correlate simulated and experimental luminescence data.
  • Loading and activity assessment of the bioactive molecule OXA within the hydrogel matrix.

Main Results:

  • Tunable rheological properties of Eu(III)-IDA hydrogels were achieved by adjusting the metal:ligand ratio.
  • Eu(III) luminescence served as a sensitive probe for material structure elucidation, validated by computational methods.
  • Proposed molecular structures for different Eu(III)-IDA gel compositions.
  • Successful loading of the bioactive molecule OXA into the hydrogels, preserving its aldose reductase activity.

Conclusions:

  • Eu(III)-IDA hydrogels exhibit tunable rheology and luminescence, enabling structural insights.
  • The combination of Eu(III) luminescence and computational analysis offers a powerful tool for characterizing advanced materials.
  • These luminescent hydrogels hold promise for applications in 3D printing and imaging-guided drug delivery.
  • Eu(III) emission-based structural elucidation can be a key technique for future material characterization.