Coordination polymer-based systems, particularly Fe(iii)-based polymers, are attracting increasing interest due to their well-controlled morphology, biocompatibility, and versatile surface functionalization. With five unpaired electrons, Fe(iii) offers a promising and safer alternative to Gd(iii) for MRI applications. While some studies have investigated low molecular weight Fe(iii) chelates for MRI, the exploration of Fe(iii)-based nanosystems as