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Geraldes, Carlos F.G.C. (author), Castro, M. Margarida C.A. (author), Peters, J.A. (author)Mn(III) porphyrins have great potential as Gd-free MRI contrast agents because both the cation and the ligand have interesting properties. The redox properties of the Mn(III)-ion can be exploited for the preparation of reactive oxygen species for therapy. Moreover, the porphyrin ligand allows these complexes to have a high affinity for tumor...review 2021