Fine-Tuning the Single-Molecule Magnet Properties of a [Dy(III)-Radical]2 Pair

A supramolecular species composed of a pair of nonequivalent Dy(III)–radical complexes exhibits single-molecule magnet (SMM) properties. The weak effective antiferromagnetic coupling between the Dy(III) ions can be compensated by application of a small (700 Oe) dc field, revealing the relaxation mode of the two distinct SMMs. These unique results illustrate how the dynamics of a supramolecular [Dy-Radical]2 SMM can be fine-tuned by the exchange-bias and an applied magnetic field.