A series of mixed-ligand 2D and 3D coordination polymers assembled from a novel multifunctional pyridine-tricarboxylate building block: hydrothermal syntheses, structural and topological diversity, andmagnetic and luminescent properties

摘要

A series of novel mixed-ligand coordination polymers, namely, {[Cd-2(mu(4)-L)(mu(3)-OH)(phen)(2)]center dot 2H2O}(n) (1), {[Mn-3(mu(5)-L)(2)(phen)(2)(H2O)]center dot H2O}(n) (2), [Cd-2(mu(3)-L)(H(2)biim)(2)(mu(2)-Hbiim)](n) (3), {[Pb-2(mu(4)-L)(mu(4)-bpdc)(0.5)(phen)(2)]center dot H2O}(n) (4), [Cd-2(mu(5)-L)(mu(2)-bpdc)(0.5)(phen)(2)](n) (5), and [Zn-2(mu(4)-L)(mu(2)-bpdc)(0.5)(py)(2)](n) (6), was hydrothermally synthesized using 4-(5-carboxypyridin-2-yl) isophthalic acid (H3L) as a new and virtually unexplored multifunctional pyridine-tricarboxylate building block, along with various auxiliary ligands {phen = 1,10-phenanthroline, H(2)biim = 2,2'-biimidazole, H(2)bpdc = 4,4'-biphenyldicarboxylic acid, and py = pyridine}. All the products 1-6 were characterized by IR spectroscopy, elemental, thermogravimetric, and single-crystal X-ray diffraction analyses. Compounds 1, 3, and 5 reveal 2D metal-organic layers with the kgd, fes, and 3,4,5L5 topology, respectively, whereas the metal-organic frameworks (MOFs) 2, 4, and 6 disclose 3D underlying nets with the unique (2, 4) or ins (6) topology. The results indicate that the nature of the metal(II) ion and type of auxiliary ligand play a significant role in determining the dimensionality, topology and other structural features of the obtained products. Luminescent (for 1 and 3-6) and magnetic (for 2) properties were studied and discussed.