Influence of Water Content on the Self-Assembly of Metal−Organic Frameworks Based on Pyridine-3,5-dicarboxylate

Abstract

A 0D discrete molecule [Co(3,5-pdc)(H2O)5].2H2O (1) was obtained in quantitative yield from the reaction of CoCl2.6H2O and pyridine-3,5-dicarboxylate (3,5-pdc) in pure water solvent at ambient temperature. While a 1D zigzag chain species, [{Co(3,5-pdc)(H2O)4}.H2O]n (2), was produced in a water-rich environment, a 2D layer compound, [Co(3,5-pdc)(H2O)2]n (3), with a 6(3) topology was generated under a water-reduced condition and a 2D sheet structure, [{Cu(3,5-pdc)(py)2}.H2O.EtOH]n (4), was formed under a water-poor condition. Compounds 1, 2, and 4 were characterized by single-crystal X-ray diffraction analysis. The 1D zigzag chain 2 shows a recoverable collapsing property. Compound 4 adopts a 2D sheet structure with a 4.8(2) topology, observed for the first time for the 3,5-pdc-related metal-organic frameworks. Water content was found to be an important factor in determining the topologies of the products in the self-assembly of divalent metal ions (Co2+, Cu2+) and pyridine-3,5-dicarboxylate under mild conditions.

Lanthanide‐Based Coordination Polymers Assembled by a Flexible Multidentate Linker: Design, Structure, Photophysical Properties, and Dynamic Solid‐State Behavior

“…Although dynamic porous coordination frameworks that show elastic guest accommodation based on hydrogen-bonding interactions are very attractive for the design of highly selective functional materials, they have received less attention than rigid 3D porous materials. [46] Notably only few examples of dynamic behavior have been previously reported for 1D chains, [34,47,48] and compounds 2 and 4 are to our knowledge the first that involve lanthanide ions. Furthermore, the reversible solvent inclusion of water molecules is also associated in the case of erbium and neodymium to significant differences in the luminescence efficiency as a result of the important deactivation of the NIR emission by the O À H oscillators.…”

Crystal structure of catena-tetraaqua-bis(μ4-pyridine-3,5-dicarboxylato)- μ2-oxalato-dicerium(III) dihydrate, Ce2(H2O)4(C7H3NO4)2(C2O4) · 2H2O

“…The resulting 3Dstructure showsopen channels along [001], which are occupied by free water molecules. The nitrogen atom of PDC ligand does not participate in bonding to metals, being different from cobalt-PDC compounds [4]. All hydrogen atoms in the aqualigands and free water molecules participate in the O-H···Ohydrogen bonds.…”

Synthesis and crystal structures of four mixed-ligand silver(I) complexes with sandwich-like structure

“…4,4 0 -Bipyridine (4,4 0 -bpy) and flexible 1,2-di(4-pyridyl)ethylene (dpe), as typical and excellent pyridyl-donor bridging ligands have been used to construct lots of infinite frameworks [18][19][20][21][22][23][24]. Meanwhile, hexanedioic acid (HA), pyridine-3,5-dicarboxylic acid (H 2 pdc) and 3,3 0 4,4 0 -biphenyltetracarboxylic acid (H 4 bptc) have been employed as exo-multidentate ligands for the design and construction of novel coordination polymers owing to their thermal stability and symmetry [25][26][27][28][29][30][31][32][33][34][35]. We are exploring the use of 4,4 0 -bpy/ flexible dpe and HA, H 2 pdc, plus H 4 bptc, to generate silver coordination complexes.…”