One-Dimensional and Two-Dimensional Anilate-Based Magnets with Inserted Spin-Crossover Complexes

The syntheses, structures, and magnetic properties of a family of bimetallic anilate-based compounds with inserted spin-crossover cationic complexes are reported. The structures of 1–4 present a two-dimensional anionic network formed by Mn­(II) and Cr­(III) ions linked through anilate ligands with inserted [Fe^III(sal₂-trien)]⁺ (1), [Fe^III(4-OH-sal₂-trien)]⁺ (2), [Fe^III(sal₂-epe)]⁺ (3), or [Fe^III(5-Cl-sal₂-trien)]⁺ (4) complexes. The structure of 5 is formed by anionic [Mn^IICl₂Cr^III(Cl₂An)₃]^3– chains surrounded by [Fe^II(tren­(imid)₃)]²⁺, Cl^–, and solvent molecules. The magnetic properties indicate that 1–4 undergo a long-range ferrimagnetic ordering at ca. 10 K. On the other hand, the inserted Fe­(III) cations remain in the low-spin (in 4) or high-spin state (in 1, 2, and 3). In the case of 5, half of the inserted Fe­(II) cations undergo a complete and gradual spin crossover from 280 to 90 K that coexists with a magnetic ordering below 2.5 K.