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Keywords:

  • cage compounds;
  • iron;
  • macrocyclic ligands;
  • magnetic properties;
  • N ligands
Thumbnail image of graphical abstract

Switched on: A molecular concept allows the generation of magnetism in an aqueous sample under the influence of a freshly added (bio-)chemical analyte. The analyte (a chemical reagent or enzyme) triggers the conversion of the probe, a diamagnetic chelate compound, into a paramagnetic compound (see scheme). The two probes prepared are easily accessible iron(II) chelates, and are operative at physiological conditions and/or in serum.