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.