Abstract
Two novel hexanuclear DyIII complexes with polyhydroxy Schiff-base ligands, [Dy6(L1)4(μ3-OH)4(MeOH)4]Cl2·2MeOH·2MeCN (1) and [Dy6(HL2)2(μ3-OH)2(μ3-OCH3)2(piv)10(MeOH)2] (2) (H3L1 = N,N′-bis(3-methoxysalicylidene)(propylene-2-ol)-1,3-diamine, H3L2 = 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 Dy3 triangular motifs as building blocks, and the six DyIII 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 DyIII ions in the complexes. Both complexes exhibit slow magnetic relaxation behavior.
Highlights
IntroductionThe synthesis of new single-molecule magnets (SMMs) containing lanthanide metals continues to grow because of their fascinating magnetic behaviours and potential applications in many elds such as high-density information storage, quantum computing, molecular spintronics etc.[1,2,3,4,5,6] Most of the 4f-based SMMs reported in the literature are derived from DyIII ion due to its unquenched orbital angular momentum and large intrinsic magnetoanisotropy.[7,8,9,10,11] In the past decade, a number of mono- and polynuclear DyIII complexes have been synthesized and characterized,[12] and many of them have been demonstrated to exhibit remarkable properties of singlemolecule magnets
Both complexes were synthesized under solvothermal conditions
It is interested that the complexes can be regarded as the result of the construction with Dy3 triangular motifs as building blocks, and the six DyIII ions in the complex are arranged in a newlyreported chair-shaped geometry
Summary
The synthesis of new single-molecule magnets (SMMs) containing lanthanide metals continues to grow because of their fascinating magnetic behaviours and potential applications in many elds such as high-density information storage, quantum computing, molecular spintronics etc.[1,2,3,4,5,6] Most of the 4f-based SMMs reported in the literature are derived from DyIII ion due to its unquenched orbital angular momentum and large intrinsic magnetoanisotropy.[7,8,9,10,11] In the past decade, a number of mono- and polynuclear DyIII complexes have been synthesized and characterized,[12] and many of them have been demonstrated to exhibit remarkable properties of singlemolecule magnets. Mononuclear DyIII complexes with pentagonal bipyramidal coordination geometry featuring strong axial ligand eld and weak equatorial donors exhibit very high effective energy barriers for magnetic relaxation.[13] A dinuclear DyIII complex bridged by an N23À radical ligand was observed to show magnetic hysteresis up to 8.3 K.14. A tetranuclear DyIII alkoxide cage complex and a square-based pyramid iso-propoxide-bridged pentanuclear DyIII complex have been A dinuclear DyIII complex bridged by an N23À radical ligand was observed to show magnetic hysteresis up to 8.3 K.14 A tetranuclear DyIII alkoxide cage complex and a square-based pyramid iso-propoxide-bridged pentanuclear DyIII complex have been
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