Competitive coordination aggregation for V-shaped [Co3] and disc-like [Co7] complexes: synthesis, magnetic properties and catechol oxidase activity

摘要: Unique dependence on the nature of metal salt and reaction conditions for coordination assembly reactions varying architecture nuclearity have been identified in V-shaped [Co3L4] planar disc-like [Co7L6] compounds: [CoII3L2(μ-L)2(μ-OH2)2(CF3CO2)2] (1) [CoII7(μ-L)6(μ-OMe)6]Cl2 (2) (HL = 2-{(3-ethoxypropylimino)methyl}-6-methoxyphenol). At room temperature conditions, cobalt-ligand ratios use different bases allowed unique types self-assembly. The synthetic marvel lies aggregation with respect to two unrelated cores 1 2. Complex assumes a arrangement bound L−, water trifluoroacetate anion, while 2 grows around central CoII ion surrounded by {CoII6} hexagon methoxide L−. Magnetic measurements revealed that intermetallic interactions are antiferromagnetic case complex ferromagnetic involving high spin cobalt(II) ions stabilization high-spin ground state latter case. In MeCN solutions complexes showed catalytic oxidation 3,5-di-tert-butylcatechol (3,5-DTBCH2) 3,5-di-tert-butylbenzoquinone (3,5-DTBQ) air. kinetic study turnover number (kcat) is more effective than 3,5-DTBCH2.