The oxidation of azo dyes by peroxy acids and tert-butyl hydroperoxide in aqueous solution catalysed by iron(III) 5,10,15,20-tetra(2,6-dichloro-3-sulfonatophenyl)porphyrin: product studies and mechanism
作者:George R. Hodges、John R. Lindsay Smith、John Oakes
DOI:10.1039/a902331c
日期:——
catalysed by iron(III) 5,10,15,20-tetra(2,6-dichloro-2-sulfonatophenyl)porphyrin in solution have been carried out. In single turnover experiments at pH 11.88, 9.30 and 6.93, dye bleaching by peroxy acids is a two-step process; an initial fast reaction, during which the oxoiron(IV) porphyrin is also formed, is followed by a slow phase involving the regeneration of the iron(III) porphyrin from the oxoiron(IV)
铁(III)5,10,15,20-四(2,6-二氯-)催化过氧酸和氢过氧化叔丁基氧化两种1-芳基偶氮-2-羟基萘-6-磺酸盐染料的产物研究已在溶液中进行了2-磺酰基苯基)卟啉的制备。在pH为11.88、9.30和6.93的单周转实验中,用过氧酸对染料进行漂白是一个两步过程。最初的快速反应,在此过程中还形成了oxoiron(IV)卟啉,随后是一个缓慢的阶段,涉及从oxoiron(IV)再生铁(III)卟啉。)卟啉。初始快速染料漂白的过氧酸:染料化学计量比为1∶1,而慢相染料的化学计量比为2∶1。后者相当于氧代铁(IV)卟啉对染料的4:1化学计量。在多次转换反应中,染料被氧铁(IV)卟啉π-阳离子自由基连续氧化两次,每次过氧酸:底物化学计量比为1∶1。