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Two 3-D Cluster-Based Frameworks: Highly Eight-Connected Molecular Topology and Magnetism

机译:两种基于3D簇的框架:高度八联的分子拓扑和磁性

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A couple of metal-organic frameworks (MOFs) constructed from rigid bicarboxylates are presented herein, namely, CO3(ndc)(3)(bbi)(CH3CN)(2) (1) and DY2Mn3(ndc)(6)(bipy)(2) (2), where H(2)ndc = 2,6-naphthalenedicarboxylic acid, bipy = 2,2'-pyridine, and bbi = 1,1'-(1,4-butanediyl)bis(imidazole). These two coordination polymers have been prepared through solvo/hydrothermal reactions and characterized by single-crystal X-ray study, TG, IR, and elemental analysis. Polymer 1 features a novel self-penetrating network mediated by flexible long-chain ligand and well defines a unique 4(16)center dot 5(8)center dot 6(4) topology with the treatment of Co-3 unit as an 8-connected node, which equals the highest connectivity for monometallic self-penetrating system so far. Polymer 2 represents the first example of a Mn-II-Dy-III (3d-4f) heteropentanuclear complex showing an intriguing 3-D 3(6)center dot 4(18)center dot 5(3)center dot 6 framework upon the assignment of DY2Mn3 cluster to an 8-connected node. In addition, magnetic studies of 1 reveal that the antiferromagnetic behavior is operative within the trimeric Co-3 Cluster and 2 demonstrates dominant ferromagnetic coupling interactions between Dy-III and Mn-II ions.
机译:本文介绍了由刚性双羧酸盐构成的几个金属有机骨架(MOF),即CO3(ndc)(3)(bbi)(CH3CN)(2)(1)和DY2Mn3(ndc)(6)(bipy) (2)(2),其中H(2)ndc = 2,6-萘二甲酸,bipy = 2,2′-吡啶,和bbi = 1,1′-(1,4-丁二基)双(咪唑)。这两种配位聚合物是通过溶剂/水热反应制备的,并通过单晶X射线研究,TG,IR和元素分析进行​​了表征。聚合物1具有由柔性长链配体介导的新型自穿透网络,并很好地定义了独特的4(16)中心点5(8)中心点6(4)拓扑,将Co-3单元视为8-连接节点,这是迄今为止单金属自穿透系统的最高连接性。聚合物2代表Mn-II-Dy-III(3d-4f)杂五核复合物的第一个实例,在其上显示出一个有趣的3-D 3(6)中心点4(18)中心点5(3)中心点6骨架。将DY2Mn3簇分配给8个连接的节点。此外,对1的磁性研究表明,反铁磁行为在三聚体Co-3簇中有效,而2则表明Dy-III和Mn-II离子之间的主要铁磁耦合相互作用。

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