Mixed Ligand Coordination Polymers for Metallogelation and Iodine Adsorption

Abstract

A bis-pyridyl-bis-amide derivative of diphenylmethane (L1) and terephthalate (TA) was combined with a number of metal salts [Cu(II), Zn(II), Ni(II), Co(II), and Cd(II)] in a 1:1:1 molar ratio to generate a series of coordination polymers (CP1A−CP5) which were thoroughly characterized by single crystal X-ray diffraction. All the CPs turned out to be lattice occluded crystalline solids having 4 × 4 grid framework structures. Under suitable conditions, the reactants of the corresponding CPs produced metallogels as envisaged considering a crystal engineering based structural rationale. One of the CPs, namely, CP5, demonstrated the ability to adsorb molecular iodine both in vapor and solution phase. Iodine adsorption was also found to be reversible as evident from its release in ethanol from both CP5@I 2 (vapor) and CP5@I 2 (solution). In situ synthesis of silver nanoparticles was also achieved in the gel matrix of L1 without the help of any exogenous reducing agent.

Zn(II)-Coordination Polymers with a Right- and Left-Handed Twist: Multifunctional Metal–Organic Hybrid for Dye Adsorption and Drug Delivery

“…The bis-pyridyl-bis-amide ligand (L1) was synthesized following a reported procedure. 87 All the CPs were synthesized by a slow evaporation crystallization technique from DMF/MeOH/water using a layering method (see details in the Experimental Section). The single crystals, thus obtained, were subjected to X-ray diffraction (Table 1).…”

“…N,N′-(Methylenebi(4,1-phenylene) dinicotinamide was synthesized according to a previous literature study. 87 Synthesis of [{Zn(II)(μ-L1)(Cl) 2 }•H 2 O] ∞ (CP1). The coordination polymer was synthesized by a solvent layering method.…”

“…N , N ′-(Methylenebi­(4,1-phenylene) dinicotinamide was synthesized according to a previous literature study …”

“…With this background, we set out to develop multifunctional metal–organic hybrids focusing on two widely different properties, namely, dye adsorption and drug delivery. For this purpose, we synthesized four new CPs ( CP1 – CP4 ) derived from a relatively less explored bis-pyridyl-bis-amide ligand having diphenylmethane backbone ( L1 ) − and Zn­(II)/Cu­(II)/Co­(II) halides (Scheme ). The ligating direction of the ligand L1 greatly depends on how the terminal pyridyl N atoms are oriented relative to each other, which is dependent on the free rotation of the C amide –pyridyl bond.…”

Mixed-ligand Cu(II)-containing coordination polymer based on V-shape carboxylate and pyridinyl co-linkers: structural insights, molecular docking and anti-breast cancer activity evolution

“…Within these factors, organic ligands have an important function in controlling CPs diversity [11,12]. CPs construction using O along with N-donor precursors causes the flexible topologies, within it the obtained polymers can have latent application for their distinctive properties of the metal node and the organic ligands [13]. So far, the combination of nitrogen-containing auxiliary ligands along with carboxylate has been a main factor in the generation of a series of polymer frameworks which have interesting preformances.…”