Magnetic and catalytic properties of a new copper(II)–Schiff base 2D coordination polymer formed by connected helical chains

Mono and dinuclear copper(II) naproxenato complexes containing 3-picoline and 4-picoline: synthesis, structure, properties, catechol oxidase, and antimicrobial activities

“…Both dinuclear and mononuclear copper(II) complexes displayed much less turnover number, but these results are quite comparable to those reported [56,57,[60][61][62][63]. …”

“…Among the different catechols used in catechol oxidase model studies, DTBCH 2 is the most widely used substrate due to its low redox potential for the quinone-catechol couple, which facilitates its oxidation to the corresponding quinone (3,, and to the presence of bulky substituents, that slow further oxidation reactions such as ring opening [54][55][56]. The two-electron oxidation of DTBCH 2 to quinone was investigated since this is the reaction that the copper-containing enzyme catechol oxidase catalyzes.…”

“…Constant concentration of complex and different concentration of substrate were prepared (complex: 10 −4 M, substrate: 5-10-15-20-30-40-50 × 10 −4 M). At low concentrations of DTBCH 2 , a first-order dependence of the substrate concentration was observed and saturation kinetics were found at high substrate concentrations [56,59]. The kinetic parameters (table 5) were determined by using the Michaelis-Menten equation ( figure 8) and a Lineweaver-Burk plot ( figure 9).…”

Assemblies of 1D and 2D Copper(II) Chiral Coordination Polymers by Salicylaldehyde Schiff Bases: Synthesis, Crystal Structures, and Magnetic Properties

“…[14] The neighboring Cu 4 units are bridged by single μ 1,5 -dca anion, generating a zigzag chain as shown in Figure 2a which is different from the reported in the literature. [15] These zigzag chains are arranged parallel to each other, and further connected via μ 1,5 -dca bridges to form a 2D polymeric network (Figure 2b), in which chiral ligands are interdigitated ( Figure S1, Supporting Information). …”

“…In general, all the phenoxo-bridged complexes present stronger antiferromagnetic coupling, since they show a strong overlap with the magnetic orbitals d x 2 -y 2 on both copper(II) ions. [15] Taking into account that this coupling is the most important one, we can neglect the coupling though the dca groups. Based on the isotropic Hamiltonian H = -2JS 1 S 2 , the experimental data in the whole temperature range were fitted to the Bleaney-Bowers equation modified by Kahn and co-workers to take into account some paramagnetic impurity for an isotropically coupled pair of S = 1/2 ions.…”