Structure and magnetism of two chair-shaped hexanuclear dysprosium(iii) complexes exhibiting slow magnetic relaxation.

Two novel hexanuclear Dy III complexes with polyhydroxy Schiff-base ligands, [Dy 6 (L 1 ) 4 (μ 3 -OH) 4 (MeOH) 4 ]Cl 2 ·2MeOH·2MeCN (1) and [Dy 6 (HL 2 ) 2 (μ 3 -OH) 2 (μ 3 -OCH 3 ) 2 (piv) 10 (MeOH) 2 ] (2) (H 3 L 1 = N , N '-bis(3-methoxysalicylidene)(propylene-2-ol)-1,3-diamine, H 3 L 2 = 2,3-dihydroxypropylimino)methyl)-6-methoxyphenol, piv = pivalate), have been prepared under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction, elemental analyses, thermal analyses, and IR spectroscopy. Each of the hexanuclear complexes is constructed with Dy 3 triangular motifs as building blocks, and the six Dy III ions are arranged in a chair-shaped conformation. Variable-temperature magnetic susceptibility measurements in the temperature range of 2-300 K indicate dominant ferromagnetic exchange interactions between the Dy III ions in the complexes. Both complexes exhibit slow magnetic relaxation behavior.