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Trinuclear nickel-lanthanide compounds

机译:三核镍镧系化合物

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摘要

The Schiff base compound 2,2′-{[(2-aminoethyl)imino]bis[2,1- ethanediyl-nitriloethylidyne]}bis-2-hydroxy-benzoic acid (H_4L) as a proligand was prepared in situ from 3-formylsalicylic acid with tris(2-aminoethyl)amine (tren). The trinuclear 3d-4f metal complexes of this ligand {[Ln{Ni(H_2L)(tren)}_2](NO_3)_3} (Ln = Gd, Dy, Er, Lu) could be obtained as single crystalline material by synthesizing the proligand in the presence of the metal salts [Ni(NO_3)_2·(H_2O)_6] and [Ln(NO_3)_3·(H_2O)m] (Ln = Gd, Dy, Er, Lu). In the solid state, the complexes adapt a new V shaped structure. Mass spectrometric ion signals related to the trinuclear complexes were detected both in positive and negative ion mode via electrospray ionization mass spectrometry supporting the single crystal X-ray analysis. Hydrogen/deuterium exchange (HDX) experiments in solution support the fragmentation scheme. The magnetic studies on all these compounds suggest the presence of weak antiferromagnetic interactions between neighboring metal centers.
机译:席夫碱化合物2,2'-{[((2-氨基乙基)亚氨基]双[2,1-乙二基-亚硝基乙二炔]}双-2-羟基-苯甲酸(H_4L)是从3-原位制备的甲酰水杨酸与三(2-氨基乙基)胺(t)。该配体{[Ln {Ni(H_2L)(tren)} _ 2](NO_3)_3}(Ln = Gd,Dy,Er,Lu)的三核3d-4f金属配合物可以通过合成金属盐[Ni(NO_3)_2·(H_2O)_6]和[Ln(NO_3)_3·(H_2O)m](Ln = Gd,Dy,Er,Lu)存在下的配体。在固态下,配合物适应新的V形结构。通过支持单晶X射线分析的电喷雾电离质谱,可以在正离子模式和负离子模式下检测与三核络合物有关的质谱离子信号。溶液中的氢/氘交换(HDX)实验支持碎片方案。对所有这些化合物的磁性研究表明,相邻金属中心之间存在弱的反铁磁相互作用。

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