Metal-organic and supramolecular networks driven by 5-chloronicotinic acid: Hydrothermal self-assembly synthesis, structural diversity, luminescent and magnetic properties

摘要

Four new crystalline solids, namely [Co-2(mu(2)-5-Clnic)2(mu(3)-5-Clnic)2(mu(2)-H2O)(n), (1), [Co(5-Clnic)(2)(H2O)(4)]center dot 2 (5-ClnicH) (2), [Pb(mu(2)-5-Clnic)(2)(phen)](n) (3), and [Cd(5-Clnic)(2)(phen)(2)]center dot 3H(2)O (4) were generated by hydrothermal self-assembly methods from the corresponding metal(II) chlorides, 5-chloronicotinic acid (5-ClnicH) as a principal building block, and 1,10-phenanthroline (phen) as an ancillary ligand (optional). All the products 1-4 were characterized by IR spectroscopy, elemental analysis, thermogravimetric (TGA), powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. Their structures range from an intricate 3D metal-organic network 1 with the 3,617 topology to a ladder-like 1D coordination polymer 3 with the 2C1 topology, whereas compounds 2 and 4 are the discrete OD monomers. The structures of 2 and 4 are further extended (0D -> 2D or 0D -> 3D) by hydrogen bonds, generating supramolecular networks with the 3,8L18 and ins topologies, respectively. Synthetic aspects, structural features, thermal stability, magnetic (for 1) and luminescent (for 3 and 4) properties were also investigated and discussed. (C) 2016 Elsevier Inc. All rights reserved.