Effect of coordination dissymmetry on the catalytic activity of manganese catalase mimics
作者:Ripul Mehrotra、Micaela Richezzi、Claudia Palopoli、Christelle Hureau、Sandra R. Signorella
DOI:10.1016/j.jinorgbio.2020.111264
日期:2020.12
saturation kinetics on [H2O2]. Spectroscopic monitoring of the reaction mixtures revealed the two complexes disproportionate H2O2 employing a different redox cycle, with retention of dinuclearity. The higher catalytic efficiency of [Mn2L2(OAc)2] was rationalized in terms of the larger labilizing effect of the heptadentate ligand that favors the acetate-shift and the replacement of the non-coordinating
两种混合价的Mn(II)Mn(III)络合物,[Mn 2 L 1(OAc)2(H 2 O)] BPh 4 ·2.5H 2 O和[Mn 2 L 2(OAc)2 ]·4H 2由不对称的N 4 O 2-六齿L 1(2-)(H 2 L 1 = 2-(N,N-双(2-(吡啶基甲基)氨基甲基)-6-(N-(2-羟基苄基))苄基氨基甲基)-4-甲基苯酚)和N 4 O 3七齿L 2(3-)(NaH 2 L制备并表征了2 = 2-(N,N-双(2-(吡啶基甲基)氨基甲基)-6-(N'-(2-羟基苄基)(羧甲基)氨基甲基)-4-甲基苯酚钠盐)的配体。两种配合物在Mn(II)离子周围共享一个μ-酚盐-双(μ-乙酸盐)Mn(II)Mn(III)核和N 3 O 3-配位球,但在Mn(III)周围的供体基团上有所不同(NO 4(溶剂)和NO 5)。在非质子溶剂中,这两种络合物能够歧化至少3600当量。H 2 O