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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Squaring the cube: A family of octametallic lanthanide complexes including a Dy_8 single-molecule magnet
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Squaring the cube: A family of octametallic lanthanide complexes including a Dy_8 single-molecule magnet

机译:平方立方:包括Dy_8单分子磁体的八金属镧系元素络合物

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A series of isostructural octanuclear lanthanide complexes of general formula [Ln_8(sao)_4(μ_3-OH) _4(NO_3)_(12)(DMF)_(12)] (Ln = Nd (1), Sm (2), Eu (3), Gd (4), Tb (5), Dy (6), Ho (7), Er (8); DMF = dimethylformamide) have been prepared via reactions of salicylaldoxime (saoH_2), tetramethylammonium hydroxide (Me_4NOH) with the appropriate lanthanide nitrate salt (Ln(NO_3)_3·6H_2O). The metallic skeletons of the complexes describe [Ln_4] tetrahedra encapsulated inside a [Ln_4] square with the inner core stabilised through μ_3-OH~- ions and the periphery by μ_4~-sao~(2-) ligands. The magnetic properties of compounds 2-8 were investigated by dc and ac magnetometry. Temperature dependent ac magnetic susceptibility data reveal that the dysprosium analogue (6) displays an out-of-phase signal in the absence of an applied magnetic field indicative of slow relaxation of the magnetization typical of a Single-Molecule Magnet (SMM). Micro-SQUID measurements reveal temperature and sweep rate dependent hysteresis below 1.0 K.
机译:一系列通式为[Ln_8(sao)_4(μ_3-OH)_4(NO_3)_(12)(DMF)_(12)的同构八核镧系元素配合物(Ln = Nd(1),Sm(2),通过水杨醛肟(saoH_2),四甲基氢氧化铵(Me_4NOH)反应制备了Eu(3),Gd(4),Tb(5),Dy(6),Ho(7),Er(8); DMF =二甲基甲酰胺)用适当的硝酸镧盐(Ln(NO_3)_3·6H_2O)。配合物的金属骨架描述了[Ln_4]四面体,它被包裹在[Ln_4]正方形内,其内芯通过μ_3-OH〜-离子稳定,外围被μ_4〜-sao〜(2-)配体稳定。通过直流和交流磁强法研究了化合物2-8的磁性。温度相关的交流磁化率数据显示,在没有施加磁场的情况下,analogue类似物(6)显示异相信号,该磁场指示单分子磁体(SMM)的典型磁化缓慢弛豫。 Micro-SQUID测量显示低于1.0 K的温度和扫描速率相关的磁滞。

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