Novel Iron(III) Complexes of Sterically Hindered 4N Ligands: Regioselectivity in Biomimetic Extradiol Cleavage of Catechols
作者:Ramasamy Mayilmurugan、Helen Stoeckli-Evans、Mallayan Palaniandavar
DOI:10.1021/ic702410d
日期:2008.8.4
[Fe(L)(HDBC)] (2+) complexes elicit fast regioselective extradiol cleavage (34.6-85.5%) in the presence of O 2 unlike the iron(III) complexes of the analogous linear 4N ligands known so far to yield intradiol cleavage products exclusively. Also, the adduct [Fe(L2)(HDBC)] (2+) shows a higher extradiol to intradiol cleavage product selectivity ( E/ I, 181:1) than the other adducts [Fe(L3)(HDBC)] (2+) ( E/ I
4N配体1,4-双(2-吡啶基甲基)-1,4-二氮杂苯(L1),1,4-双(6-甲基-2-吡啶基甲基)-1,4-二氮杂铁的铁(III)配合物(L2)和1,4-双(2-喹啉基甲基)-1,4-二氮杂pan(L3)在CH 3CN溶液中原位生成,表征为[Fe(L1)Cl 2](+)1,[ Fe(L2)Cl 2](+)2和[Fe(L3)Cl 2](+)3通过ESI-MS,吸收和EPR光谱以及电化学方法进行研究,并作为功能性模型用于二醇裂解儿茶酚双加氧酶。四氯儿茶酚酸酯(TCC(2-))加合物[Fe(L1)(TCC)](ClO 4)1a,[Fe(L2)(TCC)](ClO 4)2a和[Fe(L3)(TCC)] (ClO 4)3a已通过元素分析,吸收光谱和电化学方法进行了分离和表征。[Fe(L1)(TCC)](ClO 4)1a的分子结构已通过单晶X射线衍射成功确定。配合物1a在铁(III)周围具有扭曲的