Synthesis, characterization, and hydrogen bonding analysis of copper complexes with acetate bridging: insights into interactions in crystal networks.

The article describes the successful synthesis and characterization of two copper complexes using the 6-phenyl-1,3,5-triazine-2,4-diamine ligand (L1). The complexes were characterized using IR, UV-vis, and X-ray spectroscopy, and their crystallographic data were determined using X-ray diffraction. Both complexes had each copper coordinated with four oxygen atoms from four acetate anions, which were bridged between the two copper atoms. The coordination sphere around each copper was in the form of a square pyramid, with an L1 ligands coordinated from nitrogen in the triazine ring in the axial position and four acetate anions coordinated from four oxygen atoms in equatorial positions. However, there were some differences between the two complexes, with complex 1 having no center of symmetry and complex 2 having a center of symmetry. The crystal networks of both complexes exhibited various non-covalent interactions, including intramolecular hydrogen bonding, intermolecular hydrogen bonding, and π-π interaction. Hirshfeld Surfaces Analysis was conducted to obtain more detailed information about these interactions, and the fingerprint results showed that hydrogen-hydrogen interactions contributed above 45% of the surfaces in both complexes. Overall, the study provides valuable insights into the synthesis and characterization of copper complexes using L1 ligands and highlights the importance of non-covalent interactions in crystal networks.