An air-stable star-shaped Co II Co III 3 complex with only one paramagnetic Co(II) ion in the D 3 coordination environment has been synthesized from a chiral Schiff base ligand. Magnetic studies revealed that this complex exhibits slow magnetic relaxation in the absence of an applied dc field, which is one of the main characteristics of single-molecule magnets (SMMs). The relaxation barrier is as high as 109 K, which is quite large among transition-metal ion-based SMMs. The complex represents the first example of zero-field SMM behavior in a mononuclear six oxygen-coordinate Co(II) complex.structure and magnetic characterization, Fig. S1-S22, Tables S1-S3, and the cif le for 1. CCDC 881924. For ESI and crystallographic data see

A pair of enantiopure star-shaped Fe(III)(4) clusters were constructed from simple chiral ligands. AC field frequency dependence and a hysteresis loop, which are very important features of SMMs, were observed. Circular dichroism (CD) spectra demonstrated that the chirality was successfully transferred from the ligand to the coordination environment of Fe(3+) ions.

No abstract