Novel square pyramidal iron(iii) complexes of linear tetradentate bis(phenolate) ligands as structural and reactive models for intradiol-cleaving 3,4-PCD enzymes: Quinone formation vs. intradiol cleavage
作者:Ramasamy Mayilmurugan、Muniyandi Sankaralingam、Eringathodi Suresh、Mallayan Palaniandavar
DOI:10.1039/c0dt00171f
日期:——
ligand steric hindrance to molecular oxygen attack, the Lewis acidity of the iron(III) center and the ability of the complexes to rearrange the Fe–O phenolate bonds to accommodate the catecholate substrate dictate the extent of interaction of the complexes with substrate and hence determine the rates of reactions. This is in line with the observation of DBSQ/H2DBC reduction wave for the adduct [Fe(L2)(DBC)]−
这 铁(III) 双酚盐配体的配合物 1,4-双(2-羟基-4-甲基-苄基)-1,4-二氮杂panH 2(L1),1,4-双(2-羟基-4-硝基苄基)-1,4-二氮杂eH 2(L2),1,4-双(2-羟基-3,5-二甲基苄基)-1,4-二氮杂panH 2(L3)和1,4-双(2-羟基-3,5-二叔丁基苄基)-1,4-二氮杂panH 2(L4)已被分离出来,并作为结构和功能模型进行了研究3,4-PCD酶。配合物[Fe(L1)Cl] 1,[Fe(L2)(H 2 O)Cl] 2,[Fe(L3)Cl] 3和[Fe(L4)Cl] 4的特征已通过ESI-MS进行了表征,元素分析以及吸收光谱和电化学方法。的单晶X射线结构3包含FEN 2 ö 2氯发色团具有新颖方锥体(τ,0.20)协调的几何形状。Fe–O–C键角(135.5°)和Fe–O键长(1.855Å)非常接近Fe–O–C键角(133,148°)和铁–O(酪氨酸盐)