《Table 3.Hydrogen-bonding Geometry Parameters (, °) for Complexes 1～3》

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《Three Complexes Based on Synthetic-condition Strategy Involving a Universal Mixed-ligand System》

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For complex 3，Ma group has reported its structure，but it is only a very brief report，so we researched deeply and described exhaustively for the structure study.We found that，in this structure，the HO-BDC ligand shows an overall coordination mode ofμ3-η1:η0:η1:η1:η0，and theμ2-bbi performs a trans conformation.For the interactions of metal center and ligands（Fig.2 （a）） ，two Co（II）atoms are bridged together by HO-BDC ligands into a dinuclear subunit with the Co···Co distance of 4.433?，and further form one-dimensional doublestranded chains.Such adjacent chains are extende through bbi to form 2D layer structures（Fig.2 （b）Furthermore，the adjacent 2D layers are assemble through O–H···O（O (5）-H（6）···O（4）2.699（2）?Table 3） andπ···π（the centroid-to-centroid distanc of adjacent imidazole rings is 3.4763 （16）?stacking interactions to generate a 3D supramole cular structure（Fig.2 (c）） .