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, and magnetic and luminescent properties

A series of novel mixed-ligand coordination polymers, namely, {[Cd 2 (μ 4 - L)(μ 3 -OH)(phen) 2 ]·2H 2 O} n ( 1 ), {[Mn 3 (μ 5 - L) 2 (phen) 2 (H 2 O)]·H 2 O} n ( 2 ), [Cd 2 (μ 3 - L)(H 2 biim) 2 (μ 2 - Hbiim)] n ( 3 ), {[Pb 2 (μ 4 - L)(μ 4 - bpdc) 0.5 (phen) 2 ]·H 2 O} n ( 4 ), [Cd 2 (μ 5 - L)(μ 2 - bpdc) 0.5 (phen) 2 ] n ( 5 ), and [Zn 2 (μ 4 - L)(μ 2 - bpdc) 0.5 (py) 2 ] n ( 6 ), was hydrothermally synthesized using 4-(5-carboxypyridin-2-yl)isophthalic acid (H 3 L) 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.