Modeling Tyrosinase Monooxygenase Activity. Spectroscopic and Magnetic Investigations of Products Due to Reactions between Copper(I) Complexes of Xylyl-Based Dinucleating Ligands and Dioxygen: Aromatic Ring Hydroxylation and Irreversible Oxidation Products
作者:Debalina Ghosh、Rabindranath Mukherjee
DOI:10.1021/ic9713689
日期:1998.12.1
tyrosinase is presented. Using dinucleating ligands with a m-xylyl spacer three new dicopper(I) complexes have been synthesized and their reactivity with dioxygen investigated. The six-membered chelate ring forming ligands provide only two nitrogen coordinations to each copper. The complexes [Cu(I)(2)L(CH(3)CN)(2)]X(2) (X = ClO(4)(-) (1a), SbF(6)(-) (1b)) and [Cu(I)(2)(L-NO(2))(CH(3)CN)(2)][SbF(6)](2) (1c)
介绍了具有模仿酪氨酸酶反应性特征的化学系统的完整说明。使用具有间二甲苯基间隔基的双核配体,已合成了三种新的双铜(I)配合物,并研究了它们与双氧的反应性。六元螯合环形成的配体仅向每个铜提供两个氮配位。络合物[Cu(I)(2)L(CH(3)CN)(2)] X(2)(X = ClO(4)(-)(1a),SbF(6)(-)(1b) )和[Cu(I)(2)(L-NO(2))(CH(3)CN)(2)] [SbF(6)](2)(1c)[L = alpha,alpha'-bis [N-甲基-N-(2-吡啶基乙基)氨基]-间二甲苯; L-NO(2)= L]的对硝基衍生物已通过IR和(1)H NMR光谱进行了表征。O(2)与1a-c在CH(2)Cl(2)或THF中的反应是瞬时的,并导致产生苯酚的化学计量二甲苯基羟基化反应。因此,1a产生苯氧基/羟基桥接产物[Cu(II)(2)(LO)(OH)] [ClO(4)