Redox Switches for Single-Molecule Magnet Activity: An Ab Initio Insight

Cyclic OFF/Part/ON switching of single-molecule magnet behaviours via multistep single-crystal-to-single-crystal transformation between discrete Fe(ii)–Dy(iii) complexes

Multistep single-crystal-to-single-crystal transformation modulates OFF/Part/On single-molecule magnet behaviours for three discrete Fe(ii)–Dy(iii) complexes.

Probing the magnetic relaxation and magnetic moment arrangement in a series of Dy4 squares

Modulations of the first and secondary coordination geometries by dimerizing and reducing the Schiff base ligands result in the enhancement of the magnetic relaxation and rearrangement of the magnetic moments in μ₄-O²⁻ bridged Dy₄ squares.

Polymorphism in a Cobalt-Based Single-Ion Magnet Tuning Its Barrier to Magnetization Relaxation

A large barrier to magnetization reversal, a signature of a good single-molecule magnet (SMM), strongly depends on the structural environment of a paramagnetic metal ion. In a crystalline state, where SMM properties are usually measured, this environment is influenced by crystal packing, which may be different for the same chemical compound, as in polymorphs. Here we show that polymorphism can dramatically change the magnetic behavior of an SMM even with a very rigid coordination geometry. For a cobalt(II) clathrochelate, it results in an increase of the effective barrier from 109 to 180 cm^-1, the latter value being the largest one reported to date for cobalt-based SMMs. Our finding thus highlights the importance of identifying possible polymorphic phases in search of new, even more efficient SMMs.