Kahrović, Emira; Zahirović, Adnan; Višnjevac, Aleksandar; Osmanković, Irnesa; Turkušić, Emir; Kurtagić, Harun (2018) Chalcone and Flavonol Copper(II) Complexes Containing Schiff Base Co-Ligand: Synthesis, Crystal Structures and Catecholase-like Activity. Croatica chemica acta, 91 (2). pp. 195-207. ISSN 0011-1643
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Abstract
Four new heteroleptic copper(II) complexes having chalcone or flavonol ligands and Schiff base (N-phenyl-5-chlorosalicylideneimine) as co-ligand were prepared, chemically and structurally characterized and investigated as functional biomimetic catecholase models. The complexes were prepared by the solution synthesis and crystal and molecular structures were determined by X-ray diffraction. Complexes were chemically characterized by elemental analysis, infrared and electronic absorption spectroscopy as well as by electrochemical measurements. Copper(II) chalcone complexes, with square-pyramidal CuO4N core, are binuclear, featuring phenolate oxygen from the Schiff base as a bridging atom, while copper(II) flavonol complexes are mononuclear, and reveal a square planar CuO3N coordination core. Catalytic activity of the complexes in 3, 5-di-tert-butylcatechol oxidation was confirmed by spectrophotometric and electrochemical measurements. Kinetic measurements revealed that the binuclear (chalcone-containing) complexes have enhanced catalytic activity as compared to the mononuclear Cu(II) flavonol complexes. Relatively high kcat values (300 – 750 h–1) confirmed their respectable biomimetic catecholase-like activity.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | copper, Schiff base, chalcone, flavonol, catecholase activity |
| Subjects: | NATURAL SCIENCES > Chemistry |
| Divisions: | Division of Physical Chemistry |
| Depositing User: | Aleksandar Višnjevac |
| Date Deposited: | 04 Jan 2019 14:02 |
| URI: | http://fulir.irb.hr/id/eprint/4391 |
| DOI: | 10.5562/cca3334 |
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