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A ROOM-TEMPERATURE ORGANOMETALLIC MAGNET BASED ON PRUSSIAN BLUE

机译:基于普鲁士蓝的室温有机磁体

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THE rational design of molecular compounds that exhibit spontaneous magnetic ordering might enable one to tailor magnetic properties ties for specific applications in magnetic memory devices(1-4). In such materials synthesized previously(5-17), however, the underlying weak magnetic interactions are incapable of maintaining ordering at ambient temperatures. One remarkable exception is a compound derived from vanadium and tetracyanoethylene(18), but the material is amorphous and fragile, and consequently the molecular interactions responsible for its striking properties are not understood. Here we demonstrate another route to the synthesis of a room-temperature organometallic magnet, in which we combine a hexacyanometalate [M(CN)6](q-) with a Lewis acid L(p+). If L and M are transition-metal ions, then the orbital interactions in the resulting compound can be described by well understood principles(21-24), and it is therefore possible to choose the metals to tune the compound's magnetic properties-in particular, the magnetic ordering (Curie) temperature T-c(refs 21-26). We have synthesized a room-temperature magnetic material (T-c=315 K) that belongs to the Prussian blue family of compounds(27) (where M is chromium and L is vanadium), demonstrating that transition-metal hexacyano complexes are promising components for the construction of molecule-based high-T-c magnets.
机译:表现出自发磁性排序的分子化合物的合理设计可能使人们能够针对磁性存储设备中的特定应用量身定制磁性性质联系(1-4)。然而,在先前合成的此类材料中(5-17),潜在的弱磁性相互作用无法在环境温度下保持有序。一个显着的例外是衍生自钒和四氰基乙烯的化合物(18),但该材料是无定形且易碎的,因此尚不清楚引起其惊人性能的分子相互作用。在这里,我们展示了另一种合成室温有机金属磁体的途径,其中我们将六氰基金属酸盐[M(CN)6](q-)与路易斯酸L(p +)结合在一起。如果L和M是过渡金属离子,则可以通过众所周知的原理描述所形成化合物中的轨道相互作用(21-24),因此可以选择金属来调节化合物的磁性,特别是,磁性排序(居里)温度Tc(参考21-26)。我们合成了一种室温磁性材料(Tc = 315 K),该材料属于普鲁士蓝化合物家族(27)(其中M为铬,L为钒),证明过渡金属六氰基配合物是该化合物的有前途的成分分子基高Tc磁体的构造。

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