Synthesis and Characterization of a New Metal Hydrogen-bonded Supramolecular Organic Framework

Metal Hydrogen-bonded organic frameworks (M-HOFs) are new crystalline porous materials formed through hydrogen bonding interactions between organic units, including metal-containing moieties. These frameworks are further strengthened by weak interactions like van der Waals forces and CH…π interactions [۱]. Compared to other porous materials, M-HOFs offer advantages such as high crystallinity, ease of synthesis, recyclability, and tunable pore characteristics. They have lower density and toxicity than MOFs and offer stability against water. However, challenges remain in terms of strength and porosity, with ongoing efforts focused on enhancing these aspects for applications in gas storage [۲-۳]. In this study, we introduce the synthesis of a new M-HOF structure utilizing an anionic N-donor organic ligand and metal cation. This method enables the formation of supramolecular structure formed of nanosized crystals. The interaction between metal ions and heterocyclic ligands is crucial for structural stabilization and catalytic activity [۴-۵]. As with other coordinating ligands, the interaction between the metal and ligand is critically influenced by the electronic and chemical properties of the metal ion, the characteristics of the ligand, and the accessibility of donor sites. The titled complex showed notable broadband near ۳۳۰۰ cm−۱ due to the presence of the N–H group in the ligand. In the IR spectrum of the titled complex, characteristic bands of the N-protonated ligand ring are observed at ۱۶۹۷–۱۶۹۸ cm⁻¹. These bands appear approximately ۳۰ cm⁻¹ higher than those of the free ligand, attributed to the coordination of the ligands to the metal atom [۶].

کلیدواژه ها:

M-HOF ، Porous Material ، Gas Storage ، Hydrogen Bond