Co^II and Zn^II Coordination Frameworks with Benzene-1,2,3-tricarboxylate Tecton and Flexible Dipyridyl Co-Ligand: A New Type of Entangled Architecture and a Unique 4-Connected Topological Network

Hydrothermal reactions of CoII or ZnII acetate with benzene-1,2,3-tricarboxylic acid (H3bta) and 1,2-bi(4-pyridyl)ethane (bpa) afford two unique metal–organic frameworks, in which 1 represents a new type of entangled architecture formed via polycatenane of a pair of (4,4) net with one two-dimensional 3-connected self-interpenetrating pattern, while 2 shows a three-dimensional 4-connected net with a new trinodal topology.将乙酸钴(II)与乙酸锌(II)分别与苯-1,2,3-三羧酸（benzene-1,2,3-tricarboxylic acid，H3bta）以及1,2-二(4-吡啶基)乙烷（1,2-bi(4-pyridyl)ethane，bpa）进行水热反应，得到两种独特的金属有机骨架（metal–organic frameworks）。其中化合物1为一种新型缠结结构：该结构由一对(4,4)网格通过聚索烃构筑而成，并伴随二维3连接自穿插模式；而化合物2则展现出一种具有新型三节点拓扑的三维4连接网格结构。