writer：Feilong Hu*, Huahong Zou, Xuebo Zhao, Yan Mi, Caili Luo and Yunxiao Wang
keywords：entangled coordination polymers
source：期刊
specific source：CrystEngComm, 2013, 15,6，1068-1076
Issue time：2013年
The self-assembly of transition metal salts with dicarboxylate ligands and second ligands afford a series of entangled coordination frameworks based on different metal clusters, namely, [Ni2(oba)2(bpy)2(H2O)2]·(DMF)(H2O)2 (1), [Ni2(oba)2(bpy)2(sa)(H2O)2]·(H2O)4 (2), [Cu5(oba)4(bpy)5(pca)2(H2O)4]·(H2O)9 (3), [Co3(oba)2(bpy)2(dbca)2]·(H2O)6 (4), [Co3(oba)2(dbca)2(H2O)] (5) and [Co3(oba)2(bph)2(SO4)]·(H2O)4 (6) [oba = 4,4′-oxydibenzoic acid; bpy = 4,4′-bipyridine; dbca = [1,1′-biphenyl]-2,2′-dicarboxylic acid; sa = 2-hydroxybenzoic acid; pca = picolinic acid; bph = (1E,2E)-1,2-bis(pyridin-4-ylmethylene)hydrazine]. Their structures were determined by single-crystal X-ray diffraction analysis and further characterized byelemental analysis, IR spectra and TG analyses. The auxiliary ligands play important roles in the formation of various entangled networks. 1 shows a box-like structure and is interlocked in a parallel fashion. Compound 2 represents the first example of a 3D polycatenated framework with different size arms. 3 displays 2D → 3D entangled polymers with polycatenated and polythreaded features based on 4,4-sql layers, which are formed by short/long alternate pillars. 4 shows an interesting framework of 2D → 3D polythreading feature with a Co3 cluster occupying the corner of the grid. However, 5 displays 3D polycatenation with a 1D zigzag metal chain. An unusual [Co3SO4] unit, which is linked by four bph ligands and four oba ligands, exhibiting an anionic three-dimensional (3D) framework is observed in 6. Compounds 4–6 display antiferromagnetic properties.