Iron(III) complexes are under investigation as MRI contrast agents, and new challenges have delineated the way they are being developed. This review article describes the enhanced features that have been develolped in the last 15 years of research. The consequences of relaxation theory impose kinetic, thermodynamic, and structural requirements on the potential contrast agent. Iron, as an endogenous metal, might fulfil these expectations, so its specificity is discussed here. The

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