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

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posted on 17.11.2014, 00:00 authored by Alexandre Abhervé, Miguel Clemente-León, Eugenio Coronado, Carlos J. Gómez-García, Martin Verneret
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 14 present a two-dimensional anionic network formed by Mn­(II) and Cr­(III) ions linked through anilate ligands with inserted [FeIII(sal2-trien)]+ (1), [FeIII(4-OH-sal2-trien)]+ (2), [FeIII(sal2-epe)]+ (3), or [FeIII(5-Cl-sal2-trien)]+ (4) complexes. The structure of 5 is formed by anionic [MnIICl2CrIII(Cl2An)3]3– chains surrounded by [FeII(tren­(imid)3)]2+, Cl, and solvent molecules. The magnetic properties indicate that 14 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.