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首页> 外文期刊>Chemistry: A European journal >Reversible solvatomagnetic switching in a spongelike manganese(II)- copper(II) 3D open framework with a pillared square/octagonal layer architecture
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Reversible solvatomagnetic switching in a spongelike manganese(II)- copper(II) 3D open framework with a pillared square/octagonal layer architecture

机译：具有柱状方形/八边形层结构的海绵状锰（II）-铜（II）3D开放框架中的可逆溶剂磁转换

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The concept of "molecular magnetic sponges" was introduced for the first time in 1999 by the creative imagination of the late Olivier Kahn. It refers to the exotic spongelike behavior of certain molecule-based materials that undergo a dramatic change of their magnetic properties upon reversible dehydration/rehydration processes. Here we report a unique example of a manganese(II)-copper(II) mixed-metal-organic framework of formula [Na(H _2O) _4] _4[Mn _4{Cu _2(mpba) _2(H _2O) _4} _3]· 56.5 H _2O (1) (mpba=N,N′-1,3-phenylenebis(oxamate)). Compound 1 possesses a 3D Mn ~(II) _4Cu ~(II) _6 pillared layer structure with mixed square and octagonal pores of approximate dimensions 1.2× 1.2 nm and 2.1× 3.0 nm, respectively, hosting a large amount of crystallization H _2O molecules and hydrated Na I countercations as guests. It reversibly switches from a crystalline hydrated phase with long-range ferromagnetic ordering at a rather high critical temperature (T _c) of 22.5 K to an amorphous dehydrated phase with T _c as low as 2.3 K, which is accompanied by a breathing-type dynamic effect involving a large crystal volume (ca. 45 %) and color changes after water desorption/adsorption. The combination of both the open-framework structure and the spongelike optical, mechanical, and magnetic switching behavior in this new class of oxamato-based porous magnets offers fascinating possibilities in designing multifunctional materials for host-guest molecular sensing.
机译：已故的奥利维尔·卡恩（Olivier Kahn）的创造性想象力于1999年首次引入“分子磁性海绵”的概念。它是指某些基于分子的材料的异乎寻常的海绵状行为，这些材料在可逆的脱水/再水化过程中会发生磁性性质的巨大变化。在这里，我们报告式[Na（H _2O）_4] _4 [Mn 4 {Cu _2（mpba）_2（H _2O）_4} _3]·56.5 H _2O（1）（mpba = N，N'-1,3-亚苯基双（草酸酯））。化合物1具有3D Mn〜（II）_4Cu〜（II）_6柱状结构，其混合正方形和八边形孔的尺寸分别约为1.2×1.2 nm和2.1×3.0 nm，具有大量的结晶H _2O分子和水合Na I抗衡离子作为客人。它可逆地从在22.5 K的较高临界温度（T _c）下具有长距离铁磁有序的结晶水合相转换为T _c低至2.3 K的无定形脱水相，并伴有呼吸型动态变化。吸水/解吸后，晶体体积较大（约45％），颜色变化的效果。在这种新型的以天麻毒素为基础的多孔磁体中，开放框架结构与海绵状光学，机械和磁性转换行为的结合，为设计用于客体分子传感的多功能材料提供了引人入胜的可能性。

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