Functional modeling of the MnCAT active site with a dimanganese(III) complex of an unsymmetrical polydentate N 3 O 3 ligand
作者:Gabriela N. Ledesma、Elodie Anxolabéhère-Mallart、Laurent Sabater、Christelle Hureau、Sandra R. Signorella
DOI:10.1016/j.jinorgbio.2018.04.023
日期:2018.9
A new diMnIII complex, [Mn2L(OAc)2(H2O)](BPh4)·3H2O (1), obtained with the unsymmetrical N3O3-ligand H3L = 1-[N-(2-pyridylmethyl),N-(2-hydroxybenzyl)amino]-3-[N′-(2-hydroxybenzyl),N′-(benzyl)amino]propan-2-ol, has been prepared and characterized. The unsymmetrical hexadentate ligand L3− leads to coordination dissymmetry (dissimilar donor atoms) around each Mn ion (N2O4 and NO4(solvent), respectively)
一种新的diMn III络合物,[锰2 L(OAC)2(H 2 O)](BPH 4)·3H 2 O(1),与所述非对称得到Ñ 3 ö 3 -配体ħ 3 L = 1- [ Ñ -(2-吡啶基甲基),N-(2-羟基苄基)氨基] -3- [ N '-(2-羟基苄基),N '-(苄基氨基)丙烷-2-醇已被制备和表征。不对称的六齿配体L 3−导致每个Mn离子(N 2 O 4和NO 4)周围的配位不对称(不同的供体原子)(分别为溶剂)在Mn过氧化氢酶中,在两个Mn离子之一上留下一个不稳定的位点,该位点促进金属中心与H 2 O 2的相互作用。1能够催化乙腈中的H 2 O 2歧化,其二阶速率常数k cat = 23.9(2)M -1 s -1。Mn II 2态的可及性和两个单电子还原过程的接近性表明1采用Mn III 2 / Mn II 2氧化态进行催化。