Architectonic and Desolvation Activation Energies of Five New Mixed-Ligand Copper(II) Coordination Polymers of 5-Sulfoisophthalate and 1,3-Bis(1H-imidazol-1-yl)propane or 1,4-Bis(1H-imidazol-1-yl)butane
Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Five new coordination polymers, [Cu 3 (imp) 4 (sip) 2 ]•2H 2 O (1), {[Cu 3 (imp) 6 (H 2 O) 2.5 ](sip) 2 }•15H 2 O (2), [Cu 2 (imp)(sip)(OH)(CH 3 OH)]•CH 3 OH (3), {[Cu 3 (timp) 6 (H 2 O) 4 ](sip) 2 }•15H 2 O (4), and [Cu 3 (timp) 3 (sip) 2 (H 2 O) 2 ]•4H 2 O (5) were synthesized via solvothermal reactions using copper(II) and mixed ligands, including 5-sulfoisophthalate ions, (sip) 1,3-bis(1H-imidazol-1-yl)propane (imp), and 1,4-bis(1H-imidazol-1-yl)butane (timp). Characterization techniques, including FT-IR spectroscopy, thermal analysis, and single-crystal X-ray diffraction, confirmed the successful formation of these polymers. Single-crystal X-ray diffraction revealed that compounds 1, 4, and 5 crystallize in space group P 1 ¯, while 2 and 3 crystallize in P 2 1 / c and Pnnm, respectively. All of the coordination polymers include multiple copper ions with different coordination geometries. In compounds 1, 2, 3, and 4, the copper(II) ions have octahedral and trigonal bipyramidal geometries, whereas 5 contains copper(II) ions with square pyramidal and square planar geometries. The thermal behavior of all compounds was investigated under a nitrogen atmosphere. Decomposition occurs within the 150–300 °C range, beginning with desolvation. The activation energies for this process were measured, ranging from 32 to 89 kJ mol– 1, providing valuable insights into the compounds’ thermal properties. Notably, desolvation studies indicated similar thermal properties for 1, 3, and 5, which exhibit single-step desolvation, while 2 and 4 dehydrate in two distinct steps.
Source: Crystal Growth & Design
Institutions: University of Cape Town, Université de Dschang
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4407678454