Cubes on a string: a series of linear coordination polymers with cubane-like nodes and dicarboxylate linkers

The Construct and Interpretation of Chelated Coordination Polymers and Their Use in Nanomaterials Research

Presently, an important step from basic research to practical applications is synthesizing nanostructured materials. Metal-organic structures, as well as coordination polymers, are a diverse group of materials with a wide range of potential and properties applications. It has been difficult to get these materials into commercial use because of many drawbacks. Polymers containing chelated units are described and assessed for their advancements and problems in preparation, properties, and structure. Here, a proposed approach based on designing coordination polymeric materials with chelated units using the metal-ligand approach (CPM-CU-MA) has been introduced for a columnar-layered plan, supramolecular components, and building levels. Nanocomposite materials can be formed through the thermal transformation of coordination polymers based on donor atoms. The polymeric metal chelates (PMCs) are categorized according to luminescent coordination polymer (LCoP) development. It is classified as macrocyclic intracomplex, polynuclear, and molecular according to its macrostructure. Supramolecular networks (SMNs) can be transformed into a coordination polymer by introducing cyclo-dehydrogenation of natural building blocks on a surface. The structure-property connections of LCPs can influence a framework of liquid crystal display (LCP) that has been given based on LC phase modulators with a large modulation depth and has useful applications in LC lens. In the spatial organization of PMCs, the main focus is on the commonalities and contrasts between higher- and lower-molecular-weight chelates based on molecularly imprinted sensors (MISs) and nanomaterial sensors for a wide range of uses. New functional nanoparticles based on the molecular components have exciting potential, as demonstrated by these findings based on parameters risk factors for human health, hazards reduction in the environment, lack of cost-effectiveness, environmental sustainability, and bioavailability of polymers with an overall performance of 95.3%.

Anion and solvent controlled growth of crystalline and amorphous zinc(ii) coordination polymers and a molecular complex

Controlled bottom-up synthesis of amorphous coordination polymers with tailored metal coordination is a research field in its infancy. In this study, synthesis control was achieved to selectively prepare one-dimensional (1D) crystalline and amorphous zinc(ii)-based coordination polymers and a dimeric molecular compound, all with similar coordination geometry as evidenced by X-ray diffraction and total scattering studies. The compounds were obtained by bottom up self-assembly of Zn(ii) with terephthalate (tph^2-) as linker and the enantiopure chelating ligand S-(1,2)-bis(1H-benzimidazol-2-yl)ethanol (L). The solvent and the coordination ability of the precursor zinc salt anion control the crystalline products formed by slow diffusion at room temperature: perchlorate allows isolation of the phase pure crystalline 1D polymer {[Zn(tph)(L)]·H₂O·3DMF}_n (1·H₂O·3DMF, DMF = N,N-dimethylformamide). In contrast, zinc chloride leads to the formation of either a mixture of polymeric 1·H₂O·3DMF and a dimeric molecular species [Zn₂Cl₂(tph)(L)₂]·4DMF (2·4DMF), or to the phase pure dimer 2·4DMF, depending on the Zn(ii) : tphH₂ stoichiometry. A modified synthesis using zinc nitrate and fast precipitation by base addition results in an amorphous analogue of the 1D polymer (3). Chains of 1·H₂O·3DMF pack into a non-porous crystalline material with a surface area of just 6 m² g^-1, while the outer surface area of amorphous polymer 3 is a factor of eight larger. Hence, the amorphous compound provides larger metal site accessibility for potential surface chemical reactions, while maintaining the coordination geometry of the metal sites. The temperature response of crystalline polymer 1·H₂O·3DMF was studied using multi-temperature single crystal X-ray diffraction (100-300 K). The a = b axes display normal positive thermal expansion, while the c axis remains constant with increasing temperature due to partial relaxation of the terephthalate linkers and slightly changed geometry within the individual polymer chains.