Copper(I)−Dioxygen Reactivity of [(L)Cu<sup>I</sup>]<sup>+</sup> (L = Tris(2-pyridylmethyl)amine): Kinetic/Thermodynamic and Spectroscopic Studies Concerning the Formation of Cu−O<sub>2</sub> and Cu<sub>2</sub>−O<sub>2</sub> Adducts as a Function of Solvent Medium and 4-Pyridyl Ligand Substituent Variations
作者:Christiana Xin Zhang、Susan Kaderli、Miguel Costas、Eun-il Kim、Yorck-Michael Neuhold、Kenneth D. Karlin、Andreas D. Zuberbühler
DOI:10.1021/ic0205684
日期:2003.3.1
EtCN (J. Am. Chem. Soc. 1993, 115, 9506), involving reversible formation (k(1)/k(-1)) of [(L(R))Cu(II)(O(2-))](+) (2(R)), which further reacts (k(2)/k(-2)) with 1(R) to form the 2:1 Cu(2)O(2) complex [[(L(R))Cu(II)](2)(O(2)(2-))](2+) (3(R)). In EtCN, the rate constants for formation of 2(R) (k(1)) are not dramatically affected by the ligand electronic variations. For R = Me and tBu, the kinetic and thermodynamic
O(2)绑定到Cu(I)配合物的动力学和热力学行为可以提供对铜(I)/双氧化学的基本了解,这在化学和生物系统中很重要。在这里我们报告了一系列四齿铜(I)配合物[(L(R))Cu(I)(MeCN)](+)(1(R),R = H,丙腈(EtCN),四氢呋喃(THF)和丙酮中的Me,tBu,MeO,Me(2)N)。详细介绍了4-吡啶基取代的三(2-吡啶基甲基)胺配体(L(R))和铜(I)配合物的合成。[[L(R))Cu(I)-CO](+)配合物的1(R)和nu(CO)的电化学性质表明了配体电子性质的变化。在EtCN和THF中的动力学研究表明1(R)的O(2)反应遵循为EtCN中的1(H)氧化建立的反应机理(J. Am。化学 Soc。1993,115,9506),涉及[(L(R))Cu(II)(O(2-))](+)(2(R)的可逆形成(k(1)/ k(-1)) ),进一步使(k(2)/ k(-2))与1(R)反应形成2:1