Facile synthesis of three new nanosized supramolecular imidazole-carboxylato Cu(II) coordination polymers of promising biological activity

The current study describes the synthesis and complete characterization of three new copper coordination polymers, namely {[Cu₂(tyr)₂(Him)₃(Cl)₂(H₂O)₂].H₂O}_n 1, {[Cu₂(bdc)₂(Him)₃(H₂O)₄].H₂O}_n 2, and {[Cu(btec)(Him)₂].3H₂O}_n 3, where L-tyr = L-tyrosine, H₂bdc = terephthalic acid, H₄btec = pyromellitic acid, and Him = imidazole. They were characterized using various analytical techniques such as elemental analysis, FT-IR, UV–Vis, magnetic measurements, molar conductance, MM2 theoretical calculations, TG/DTA, and XRPD. Additionally, the catalytic activity of the complexes toward H₂O₂ decomposition was evaluated as well as their biological activity was tested against bacteria and fungi. The complexes exhibit an octahedral geometry around the copper centers. Thermogravimetric analysis confirmed the thermal stability of the complexes and their proposed structures. The results of the properties, including magnetism, activation energy (E*), nanoparticle sizes, catalytic activity and biological activity of these complexes were computed and discussed. The functional groups, hydrogen bonding, and copper ions significantly influenced the structures, physical properties and biological activity. The findings suggest that complex 1 is a promising candidate as a catalyst and medical transport, while complexes 2 and 3 are promising candidates as porous materials.