Copper(ii) complexes of a polydentate imidazole-based ligand. pH effect on magnetic coupling and catecholase activity
作者:Edgar Mijangos、Jan Reedijk、Laura Gasque
DOI:10.1039/b714283h
日期:——
increasing the basicity of the solution. The catalytic performance of the oxidation of 3,5-di-tert-butylcatechol to its corresponding quinone was studied using UV-Vis-NIR absorption spectroscopic methods in CH3CN–H2O and in CH3OH–H2O at pH = 7.5, 8.0 and 8.5. A marked increase in activity, consistent with the formation of the hydroxide bridged species, is observed at pH = 8.5 in both solvent mixtures, but the
N 8 O 4潜在的十年代供体配体 从...获取 2,2'-联咪唑 和 大号缬氨酸并通过化学和光谱方法对不同质子化程度的四核Cu(II)配合物进行了表征。进行的广泛的溶液研究表明,pH介质的升高依次导致了咪唑并(p K a (1)和p K a (2))和羟基(p K a (3)和p K a (4)的形成。)的桥梁。冷冻溶液电子病历 研究表明信号强度降低,直到EPR无声为止 光谱当增加溶液的碱度时,观察到。氧化的催化性能。3,5-二叔丁基邻苯二酚 到其对应的 醌在CH 3 CN–中使用UV-Vis-NIR吸收光谱法进行了研究高氧2并在CH 3 OH中高氧2pH = 7.5、8.0和8.5。在pH = 8.5和pH 8.5时,均观察到活性显着增加,这与氢氧化物桥联物质的形成一致。溶剂混合物,但在CH 3 OH–中的活性明显更高高氧2。