Reference of 1806-29-7, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 1806-29-7, C12H10O2. A document type is Article, introducing its new discovery.
Three ligands L1, L2, and L3 with 2, 4, and 6 1,4,7,10-tetraazacyclododecane (cyclen) moieties attached to a cyclotriphosphazene core, respectively, were synthesized, and oxidation activities of their CuII complexes were investigated. Aerobic oxidation of catechol by these complexes follows an intramolecular dinuclear pathway with significant cooperativity (i.e., theta ? 1.5 out of a maximum of 2 for two potential substrate binding sites) and kinetic constants (i.e., kcat = 17.5 × 10?3 s?1, Km = 2.8 mm, and quite remarkable catalytic specificity kcat/Km 12.5 m?1 s?1 per di-Cu center), while that by untethered CuII?cyclen follows a bimolecular dinuclear pathway without noticeable cooperativity (theta = 0.96) and fourfold lower kcat, despite their similar dinuclear mechanisms. The proximity of CuII centers is suggested by EPR spectra and relaxations, showing a broad spectral component particularly in Cu6L3. Thermodynamic parameters also indicate the significance of multi-CuII sites in the oxidative catalysis. Air is a more specific oxidation agent for the representative complex Cu2L1, showing 3.2-fold higher catalytic specificity kcat/Km than H2O2 toward a catechol substrate. The research provides further molecular basis for future design of O2/H2O2-specific oxidation of multi-domain Cu complexes.
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