Metal-organic frameworks with pyridyl- and carboxylate-containing ligands: syntheses, structures and properties

Assembly reactions of pyridyl-and carboxylate-containing ligand 5-(isonicotinamido)isophthalic acid (H(2)INAIP) with corresponding metal salts result in formation of six new coordination polymers, namely {[Mn(INAIP)(DMF)]center dot 0.5DMF}(n) (1), {[Mn(INAIP)(H2O)(2)]center dot 4H(2)O}(n) (2), {[Co(INAIP)(H2O)]center dot 2H(2)O}(n) (3), {[Co(INAIP)(bpy)(0.5)]}(n) (4), {[Co(INAIP)(Him)(H2O)]center dot H2O}(n) (5), and {[Cu(INAIP)(Him)(H2O)]center dot H2O}(n) (6) (DMF N,N-dimethylformamide, bpy - 4,4'-bipyridine, Him imidazole). The results of single-crystal X-ray diffraction analysis indicate that 1 is a two-fold interpenetrated three-dimensional (3D) framework with sra topology, complexes 2, 5 and 6 have two-dimensional (2D) network structure with (6,3) topology, while 3 and 4 have infinite 2D bi-layer structure with different topologies. Complex 3 exhibits a 4-connected network with the Schlafli symbol (4(3).6(3)), and 4 displays a (4,5)-connected net with Schlafli symbol (4(3).5(2).6)(4(3).5(5).6(2)). The magnetic and adsorption properties of the complexes were investigated.