pH-controlled synthesis of two new coordination polymers modeled by pyridine-2,4-dicarboxylic acid

Two coordination polymers constructed by 5-[(4-carboxyphenoxy)methyl]benzene-1,3-dicarboxylic acid and 2,2′-bipyridine: syntheses, structures and luminescence properties

“…The three carboxylic acid groups of H 3 L can adopt various coordination modes. In addition, factors such as reaction temperature, pH values, solvents, metal ions and organic ligands play important roles in the construction of CPs (Ma et al, 2015;Wen & Xu, 2017;Meng et al, 2012;Liu et al, 2011). Thus, we used these organic ligands to react with different metal ions and two new CPs, namely {[Cd 2 (L)(HCOO)(bpy) 2 (H 2 O)]ÁH 2 O} n (1) (Scheme 1) and {[Mn(HL)(bpy)]Á1.5H 2 O} n (2) (Scheme 2), were prepared under hydrothermal conditions.…”

Research on single-crystal-to-single-crystal photoaddition and extension of Schmidt's rule in topological chemistry

“…Adjusting the ratio of the reactants to control the pH of the reaction solution is an effective way of regulating the crystal structure of the complexes. 27–30 Complexes synthesized with zinc ions, H 3 btc and 1,4-bpeb ligands were previously reported where one of the three carboxyl groups of H 3 btc was not deprotonated. 19,20 When NaOH was added to the reaction system, it facilitated the deprotonation of all three carboxyl groups of H 3 btc, resulting in the assembly of a new MOF, {[Zn 2 (μ 3 -OH)(1,3,5-btc)(1,4-bpeb)]·4.5H 2 O} n , 1 .…”

Stitching 2D Polymeric Layers into Flexible 3D Metal–Organic Frameworks via a Sequential Self-Assembly Approach

“…Over the last few decades, there has been continued interest in the rational design and synthesis of coordination polymers (CPs) or metal–organic frameworks (MOFs) not only because of their applications in fields such as gas storage/separation, catalysis, luminescence, and sensors but also because of their fascinating topological structures. − Generally, extended coordination framework solids allow for the judicious choice of metal centers and organic linkers to obtain various geometries and functionalities. − Nonetheless, a number of structural and experimental factors, such as the coordination geometry of the metal ions and ligands, pH, metal/ligand ratio, and temperature, have been found to play important roles in the construction of coordination polymers. − Therefore, it is still a challenge to rationally design and synthesize target CPs and understand the rules of self-assembly.…”