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August 20, 1999Chemical Reviews

Gadolinium(III) Chelates as MRI Contrast Agents:  Structure, Dynamics, and Applications

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Authors

PCPeter CaravanHarvard UniversityJEJeffrey J. EllisonDuPont (United States)TMThomas J. McMurryFlorida State University

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Implication

Review reveals how coordination chemistry and molecular dynamics govern gadolinium(III) chelate efficacy, highlighting design principles for targeted magnetic resonance imaging contrast agents.

Key Points

  • Review the coordination chemistry, physical dynamics, and structural properties governing the performance and design of gadolinium(III) complexes as magnetic resonance imaging contrast agents.
  • Evaluated coordination geometries, thermodynamic stabilities, and kinetic inertness of diverse polyaminocarboxylate and related gadolinium(III) chelates.
  • Analyzed physical factors driving relaxivity mechanisms, focusing on inner-sphere water exchange rates, rotational tumbling times, and electronic relaxation.
  • Surveyed clinical diagnostic agents and investigational designs, including macromolecular blood-pool agents and responsive physiological probes.
  • Inner-sphere hydration number and ligand exchange kinetics determine relaxivity, with optimal water residence times substantially enhancing magnetic field contrast.
  • Slowing molecular rotation through macromolecular conjugation or protein binding markedly boosts relaxivity at conventional clinical magnetic field strengths.

Cite This Study

Caravan et al. (1999) studied this question.

synapsesocial.com/papers/69d7f43f3eff0c9dfaae2c9ehttps://doi.org/10.1021/cr980440x
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