A new mononuclear manganese(III) complex of an unsymmetrical hexadentate N3O3 ligand exhibiting superoxide dismutase and catalase-like activity: synthesis, characterization, properties and kinetics studies
作者:Gabriela N. Ledesma、Hélène Eury、Elodie Anxolabéhère-Mallart、Christelle Hureau、Sandra R. Signorella
DOI:10.1016/j.jinorgbio.2015.02.012
日期:2015.5
A mononuclear MnIII complex MnL·4H2O (H3L = 1-[N-(2-pyridylmethyl),N-(2-hydroxybenzyl)amino]-3-[N′-(2-hydroxybenzyl),N′-(4-methylbenzyl)amino]propan-2-ol) has been prepared and characterized. This complex catalyzes the dismutation of superoxide efficiently, with catalytic rate constant kcat = 1.7 × 106 M− 1 s− 1 and IC50 1.26 μM, obtained through the nitro blue tetrazolium photoreduction inhibition
单核Mn III配合物MnL·4H 2 O(H 3 L = 1- [N-(2-吡啶基甲基),N-(2-羟基苄基)氨基] -3- [ N '-(2-羟基苄基),N ' -(4-甲基苄基)氨基]丙烷-2-醇已被制备和表征。该配合物在pH 7.8的水溶液中通过硝基蓝四唑鎓光还原抑制超氧化物歧化酶测定获得的催化速率常数k cat = 1.7×10 6 M -1 s -1和IC 50 1.26μM有效地催化超氧化物歧化。 。MnL还能够歧化超过300当量的H2 Ó 2在CH 3 CN,用H的初始速率2 ö 2由下式给出分解ř我 = ķ猫[MNL] 2 [H 2 ö 2 ]和ķ猫 = 1.32(2)毫米- 2 分钟- 1。中的Mn的可访问IV状态(Ë p = 0.53 V,相对于饱和甘汞电极),表明MNL采用高价催化循环分解ö 2 -和H 2 ö 2。