Spin-Crossover and Slow Magnetic Relaxation Behavior in Hexachlororhenate(IV) Salts of Mn(III) Complexes [Mn(5-Hal-sal(2)323)](2)[ReCl(6)] (Hal = Cl, Br)

The cationic complexes of Mn(III) with the 5-Hal-sal(2)323 (Hal = Cl, Br) ligands and a paramagnetic doubly charged counterion [ReCl(6)](2−) have been synthesized: [Mn(5-Cl-sal(2)323)](2)[ReCl(6)] (1) and [Mn(5-Br-sal(2)323)](2)[ReCl(6)] (2). Their crystal structures and magnetic properties have been studied. These isostructural two-component ionic compounds show a thermally induced spin transition at high temperature associated with the cationic subsystem and a field-induced slow magnetic relaxation of magnetization at cryogenic temperature, associated with the anionic subsystem. The compounds are the first examples of the coexistence of spin crossover and field-induced slow magnetic relaxation in the family of known [Mn(III)(sal(2)323)] cationic complexes with various counterions.