Synthesis, structures and magnetic properties of [(η9-C9H9)Ln(η8-C8H8)] super sandwich complexes
Synthesis, structures and magnetic properties of [(η9-C9H9)Ln(η8-C8H8)] super sandwich complexes
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DOI：
10.1038/s41467-019-10976-6
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发表时间：
2019-07-17
影响因子：
16.6
通讯作者：
Roesky, P. W.
中科院分区：
文献类型：
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作者：
Muenzfeld, L.;Schoo, C.;Roesky, P. W.
夹心配合物是有机金属化学中不可缺少的组成部分，在镧系单分子磁体领域中具有越来越重要的作用。本文报道了一类基本的纯夹层配合物[(eta(9)-C9H9) Ln(eta(8)-C8H8)] （Ln=Nd, Sm, Dy, Er）。这些中性和夹心的镧系化合物只含有完全pi配位共面8和9元CH环。对这些化合物的磁性进行了研究，观察到磁化的缓慢弛豫，包括Er（III）类似物高达10 K的开放磁滞环。在零场附近也观察到磁化的快速弛豫，这是量子信息处理方案的一个非常重要的特征。我们的合成策略很简单，利用[(eta(8)-C8H8) LnI(thf)(n)]配合物与[K(C9H9)]的反应。虽然所有化合物都被充分表征，但标题化合物的结构细节也只能通过拉曼光谱推断出来。
Sandwich complexes are an indispensable part of organometallic chemistry, which is becoming increasingly important in the field of lanthanide-based single molecule magnets. Herein, a fundamental class of pure sandwich complexes, [(eta(9)-C9H9) Ln(eta(8)-C8H8)] (Ln=Nd, Sm, Dy, Er), is reported. These neutral and sandwiched lanthanide compounds exclusively contain fully pi-coordinated coplanar eight and nine membered CH rings. The magnetic properties of these compounds are investigated, leading to the observation of slow relaxation of the magnetization, including open hysteresis loops up to 10 K for the Er(III) analogue. Fast relaxation of the magnetization is likewise observed near zero field, a highly important characteristic for quantum information processing schemes. Our synthetic strategy is straightforward and utilizes the reaction of [(eta(8)-C8H8) LnI(thf)(n)] complexes with [K(C9H9)]. Although all compounds are fully characterized, structural details of the title compounds can also be deduced by Raman spectroscopy only.