Stepwise Protonation and Electron-Transfer Reduction of a Primary Copper–Dioxygen Adduct
作者:Ryan L. Peterson、Jake W. Ginsbach、Ryan E. Cowley、Munzarin F. Qayyum、Richard A. Himes、Maxime A. Siegler、Cathy D. Moore、Britt Hedman、Keith O. Hodgson、Shunichi Fukuzumi、Edward I. Solomon、Kenneth D. Karlin
DOI:10.1021/ja4065377
日期:2013.11.6
and with this complex possessing a triplet (S = 1) ground state electronic configuration, as previously determined for 1. The pre-equilibrium acid association to 1 is followed by outer-sphere electron-transfer reduction of 2 by decamethylferrocene (Me10Fc) or octamethylferrocene (Me8Fc), leading to the products H2O2, the corresponding ferrocenium salt, and [LCu(II)(OAcF)](+). Second-order rate constants
[LCu(I)][B(C6F5)4]、铜超氧配合物 [LCu(II)(O2(•–))]+ (1) (L = TMG3tren (1,已经研究了 1,1-三[2-[N(2)-(1,1,3,3-四甲基胍)]乙基]胺))。三氟乙酸 (HOAcF) 在 1:1 加合物中与 ([LCu(II)(O2(•–))]+) 中的超氧配体可逆结合 [LCu(II)(O2(•–))(HOAcF)] (+) (2),由紫外可见、共振拉曼 (rR)、核磁共振 (NMR) 和 X 射线吸收 (XAS) 光谱以及密度泛函理论 (DFT) 计算表征。化学研究表明,HOAcF 与 1 结合得到 2,Keq = 1.2 × 10(5) M(–1) (-130 °C) 和 ΔH° = -6.9(7) kcal/mol,ΔS° = −26(4) cal mol(–1) K(–1))。振动 (rR) 数据显示,与已知的 [LCu(II)(O2(•–))](+