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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Layered transition metal carboxylates: Synthesis, structural aspects and observation of multi-step magnetic transition through phase diagram
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Layered transition metal carboxylates: Synthesis, structural aspects and observation of multi-step magnetic transition through phase diagram

机译：层状过渡金属羧酸盐：合成，结构方面以及通过相图观察多步磁性跃迁

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摘要

Two new layered transition metal carboxylate frameworks, [Co 3(L)2(H2O)6]·2H2O (1) and [Ni3(L)2(H2O)6] ·2H2O (2) (L = tartronate anion or hydroxymalonic acid), have been synthesized and characterized by X-ray single crystal analysis. Both compounds have similar 2D structures. In both compounds there are two types of metal centers where one center is doubly bridged by the alkoxy oxygen atoms through μ2-O bridging to form a 1D infinite chain parallel to the crystallographic b-axis with the corners shared between the metal polyhedra. Magnetic susceptibility measurements revealed the existence of antiferromagnetic short range correlations between Co(Ni) intra-chain metal centers (with exchange constants JCo = -22.6 and JNi = -35.4 K). At low temperatures, long range order is observed in both compounds at Néel temperatures of 11 (for 1) and 16 (for 2) K, revealing that other exchange interactions, rather than the intra-chain ones, play a role in these systems. Whereas compound 1 has an antiferromagnetic ground state, compound 2 exhibits a ferromagnetic component, probably due to spin canting. Isothermal magnetization data unveiled a rich phase diagram with three metamagnetic phase transitions below 8 K in compound 1.
机译：两个新的层状过渡金属羧酸盐骨架，[Co 3（L）2（H2O）6]·2H2O（1）和[Ni3（L）2（H2O）6]·2H2O（2）（L =酒石酸酯阴离子或羟基丙二酸），已通过X射线单晶分析合成并表征。两种化合物都具有相似的2D结构。在这两种化合物中，都有两种类型的金属中心，其中一个中心通过μ2-O桥接被烷氧基氧原子双桥连接，形成平行于晶体b轴的一维无穷链，且角在金属多面体之间共享。磁化率测量表明，Co（Ni）链内金属中心之间存在反铁磁短程相关性（交换常数JCo = -22.6和JNi = -35.4 K）。在低温下，两种化合物在Néel温度分别为11（对于1）和16（对于2）K时都观察到长程有序，这表明其他交换相互作用而不是链内相互作用在这些系统中起作用。化合物1具有反铁磁性基态，而化合物2则表现出铁磁性成分，这可能是由于自旋倾斜所致。等温磁化数据揭示了化合物1中8 K以下低于3 K的三个亚磁相变的丰富相图。

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