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Unprecedented Relaxivity Gap in pH-Responsive FeIII -Based MRI Probes.

Jeremy Salaam1, Thibault Fogeron1, Guillaume Pilet2

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New ferric complexes dramatically enhance MRI contrast agents. These pH-responsive molecules offer a 71-fold increase in water relaxation rates, improving molecular imaging sensitivity.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Biomedical Imaging

Background:

  • Molecular Magnetic Resonance Imaging (MRI) faces sensitivity limitations.
  • Developing responsive contrast agents is crucial for advanced diagnostics.
  • Current contrast agents often lack significant signal amplification.

Purpose of the Study:

  • To synthesize and characterize novel mononuclear ferric complexes.
  • To investigate the pH-responsive relaxation enhancement capabilities of these complexes.
  • To explore the structural basis for their performance in MRI.

Main Methods:

  • Synthesis of two hexa-dentate macrocyclic ferric complexes.
  • Relaxivity measurements at varying pH.
  • Structural analysis of the ligand and coordination environment.

Main Results:

  • Complexes exhibit 27- and 71-fold increases in water relaxation rate acceleration upon pH change.
  • The phenomenon is fully reversible and fatigue-less.
  • Perturbed pKa values of 3.5 were observed, linked to pendant lactam/carbamate arms.

Conclusions:

  • The novel ferric complexes show exceptional pH-responsive relaxivity.
  • Macrocyclic structure and pendant arms are key to performance.
  • These findings advance the development of highly sensitive molecular MRI agents.