Abstract

A new 2D Mn(II) complex named as [Mn₃(HL)₂(H₂O)₆]_n (I) (H₄L = 3-(2,4-dicarboxyphenyl)-2,6-dicarboxypyridine) was synthesized and characterized by IR, elemental analysis, and single-crystal X-ray diffraction method (CIF file CCDC no. 1915189). The complex crystallizes in the monoclinic space group C2/c with Z = 4, a = 20.6597(11), b = 9.0949(5), c = 20.6041(12) Å, β = 110.056(6)°. The crystal consists of trinuclear Mn(II) ion clusters {Mn₃} which are linked by four independent HL^3– ligands and these trimeric units are connected into 2D structure by pentadentate HL^3– ligand in alternate bis(bridging) and chelated coordination modes. Thermogravimetry, powder X-ray diffraction, and magnetic measurement experiments are also carried out to determinethe thermal stability, phase purity and magnetism. The results show that weak antiferromagnetic interactions occur between the Mn(II) centers within bridging trinuclear {Mn₃} cluster.

中文翻译：

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新型N-杂环四羧酸配体的Mn（II）配合物的合成，晶体结构和磁性

摘要

一种新的2D Mn（II）络合物称为[Mn ₃（HL）₂（H ₂ O）₆ ] _n（I）（H ₄ L = 3-（2,4-二羧基苯基）-2,6-二羧基吡啶）通过IR，元素分析和单晶X射线衍射法合成和表征（CIF文件CCDC号1915189）。复杂的结晶单斜空间群C ^ 2 / C ^与Ž = 4，一个= 20.6597（11），b = 9.0949（5），C ^ = 20.6041（12）A，β= 110.056（6）°。晶体由三核Mn（II）离子簇{Mn ₃ }组成，它们通过四个独立的HL连接^3–配体和这些三聚体单元通过双齿（桥接）和螯合配位模式的五齿HL ^3–配体连接成二维结构。还进行了热重分析，粉末X射线衍射和磁性测量实验，以确定热稳定性，相纯度和磁性。结果表明，在桥接三核{Mn ₃ }团簇内的Mn（II）中心之间存在弱的反铁磁相互作用。