Issue 6, 2013

Second ligands-assisted structural variation of entangled coordination polymers with polycatenated or polythreaded features

Abstract

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 by elemental 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.

Graphical abstract: Second ligands-assisted structural variation of entangled coordination polymers with polycatenated or polythreaded features

Supplementary files

Article information

Article type
Paper
Submitted
20 Jul 2012
Accepted
21 Oct 2012
First published
23 Oct 2012

CrystEngComm, 2013,15, 1068-1076

Second ligands-assisted structural variation of entangled coordination polymers with polycatenated or polythreaded features

F. Hu, H. Zou, X. Zhao, Y. Mi, C. Luo and Y. Wang, CrystEngComm, 2013, 15, 1068 DOI: 10.1039/C2CE26165K

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