Polymeric Copper(II) Complexes with a Newly Synthesized Biphenyldicarboxylic Acid Schiff Base Ligand—Synthesis, Structural and Thermal Characterization

• Published in: Inorganics Vol. 10; no. 12; p. 261
• Main Authors: Bogdanović, Milica G., Radnović, Nikola D., Barta Holló, Berta, Radanović, Mirjana M., Kordić, Branko B., Raičević, Vidak N., Vojinović-Ješić, Ljiljana S., Rodić, Marko V.
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.12.2022
• Subjects: Acetic acid; Acids; Analysis; Anions; biphenydicarboxylic acid; Carboxylic acids; Chemical synthesis; Coordination compounds; coordination polymer; Copper; Copper compounds; copper(II); Crystal lattices; Crystal structure; Hydrogen; Imines; Ligands; Mathematical analysis; Mechanical properties; Methods; Nitrogen; Nitrogen atoms; Oxygen; Oxygen atoms; Phenols; Polymers; Schiff base; Schiff bases; Single crystals; Solvents; Spectrum analysis; Structural analysis; Structure; Symmetry; Thermal analysis; Thermal properties; Thermodynamic properties; Serbia
• ISSN: 2304-6740; 2304-6740
• DOI: 10.3390/inorganics10120261

The newly synthesized biphenyldicarboxylic acid Schiff base and its complexes with Cu(II) were synthesized, and their spectroscopic and structural analysis was performed. The reaction of the ligand and copper(II) acetate in different solvents resulted in the formation of two solvatomorphic complexes, one with MeOH, and the other with DMF molecules, in the crystal lattice. The differences in the results of the thermal analysis could be explained by the different polarities of the solvents present. SC-XRD analysis revealed that the ligand is coordinated as a dianion, in a pentadentate manner, through two phenoxide oxygen atoms, two azomethine nitrogen atoms, and with the oxygen atom of one carboxylate functioning as a bridge that connects the monomeric units. The coordination polyhedron was described with several parameters obtained from different methods of calculation. The presence of different solvents in the crystal structure results in differences in the H-bond networks, and an overall different crystal packing of the structural units in the obtained complexes.