A One Dimensional 3d-4f Heterometallic Chain Based on Gd3+ Nodes and Tetranuclear {Cr-4(hdpta)(2)} Complex Ligands: Synthesis, Structure and Magnetic Properties
A One Dimensional 3d-4f Heterometallic Chain Based on Gd3+ Nodes and Tetranuclear {Cr-4(hdpta)(2)} Complex Ligands: Synthesis, Structure and Magnetic Properties
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基于 Gd3 节点和四核 {Cr-4(hdpta)(2)} 配合物的一维 3d-4f 异金属链：合成、结构和磁性
DOI：
10.1007/s10876-015-0958-7
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发表时间：
2016
影响因子：
2.8
通讯作者：
Zhang Jian-Jun
中科院分区：
文献类型：
--
作者：
Liu Shu-Qin;Dong Cai-Li;Zhao He;Zhang Hui;Ni Jun;Liu Xiao-Yu;Zhang Jian-Jun
1，3-二氨基-2-羟基丙烷-N，N，N‘，N’-四乙酸(H5hdpta)与醋酸钠和Cr3+在pH 6.7的水溶液中发生组装反应，生成Na[Cr2(Hdpta)(Ac)2](1)。单晶X-射线衍射分析表明，化合物1以单核Na+结点和双核[Cr2(Hdpta)(Ac)2]−络合物为骨架，其中两个Cr3+离子被一个hdpta5−络合，两个乙酸酯辅助配体桥联。1与Gd3+进一步组装生成[Gd(NO3)3(H2O)4][Cr4Gd(hdpta)2(OH)4(H2O)5]·(NO3)·32H2O(2)。2的[Cr4Gd(Hdpta)2(OH)4(H2O)5]+阳离子以[Cr4(Hdpta)2(OH)4]2−络合物和单核Gd3+节点为基础形成一维链状结构。[Cr4(Hdpta)2(OH)4]2−具有四核的矩形金属骨架。详细的合成实验表明，加热是一种简单有效的方法来激活惰性的Cr3+离子来制备氧桥联的Cr-Ln异金属化合物。磁学研究表明，化合物2表现出全面的反铁磁性相互作用。图形摘要提出了基于双核{Cr2}单元的铬-钠化合物和含四核{Cr4}单元的铬-Gd化合物的逐步合成方法。
AbstractAssembly reaction of 1,3-diamino-2-hydroxy-propane-N,N,N′,N′-tetraacetic acid (H5hdpta), sodium acetate and Cr3+ion at pH 6.7 in aqueous solution leads to the formation of Na[Cr2(hdpta)(Ac)2] (1). Single crystal X-ray analysis show that1bears a 3D (4,4)-connected lon framework based on mononuclear Na+nodes and dinuclear [Cr2(hdpta)(Ac)2]−complex ligands in which two Cr3+ions are chelated by one hdpta5−and also bridged by two acetate auxiliary ligands. Further assemble of1with Gd3+ions give rise to [Gd(NO3)3(H2O)4][Cr4Gd(hdpta)2(OH)4(H2O)5]·(NO3)·32H2O (2). The [Cr4Gd(hdpta)2(OH)4(H2O)5]+cation of2exhibit a 1D chain structure based on [Cr4(hdpta)2(OH)4]2−complex ligands and mononuclear Gd3+nodes. [Cr4(hdpta)2(OH)4]2−has a tetranuclear {Cr4} rectangular metal skeleton. Detailed synthesis experiments indicate heating is a simple and effective way to activate the inert Cr3+ions to prepare oxygen-bridged Cr–Ln heterometallic compounds. Magnetic studies reveal that compound2shows overall antiferromagnetic interaction.Graphical AbstractStepwise synthesis of a Cr–Na compound based on dinuclear {Cr2} unit and a Cr–Gd compound bearing tetranuclear {Cr4} unit are presented.