Copper(I) and Copper(II) Complexes Possessing Cross-Linked Imidazole-Phenol Ligands: Structures and Dioxygen Reactivity
作者:Kaliappan Kamaraj、Eunsuk Kim、Benedikt Galliker、Lev N. Zakharov、Arnold L. Rheingold、Andreas D. Zuberbühler、Kenneth D. Karlin
DOI:10.1021/ja034263f
日期:2003.5.1
proton donor in the catalytic dioxygen reduction event. To provide insight into the chemistry of such a moiety, we have synthesized and characterized tetra- and tridentate pyridylalkylamine chelate ligands LN4OR and LN3OR (R = H or Me)}, which include an imidazole-phenol (or anisole) cross-link and their copper(I/II) complexes. [CuI(LN4OH)]B(C6F5)4 (1) reacts with dioxygen at -80 degrees C in THF
O2 催化还原为 H2O,并与膜质子易位偶联,发生在细胞色素 c 氧化酶的异双核血红素 a3-CuB 活性位点。CuB 连接的组氨酸之一与相邻的酪氨酸(CN 键;酪氨酸 C6 和组氨酸ε-氮)交联,并且该交联的 His-Tyr 部分的质子残基被提议作为电子和催化双氧还原事件中的质子供体。为了深入了解此类部分的化学性质,我们合成并表征了四齿和三齿吡啶基烷基胺螯合配体 LN4OR 和 LN3OR(R = H 或 Me)},其中包括咪唑-苯酚(或苯甲醚)交联和它们的铜(I/II)配合物。[CuI(LN4OH)]B(C6F5)4 (1) 在-80 摄氏度的 THF 中与分子氧反应,形成不稳定的反式-mu-1,2-peroxodicopper(II) 络合物,随后转化为二聚体铜 (II)-酚盐络合物 [Cu(LN4O-)}2](B(C6F5)4)2 (5a)。紧密类似物 [CuI(LN4OMe)]B(C6F5)4