Structure and Reactivity of Copper Complexes Supported by a Bulky Tripodal N
<sub>4</sub>
Ligand: Copper(I)/Dioxygen Reactivity and Formation of a Hydroperoxide Copper(II) Complex
作者:Sayantan Paria、Takehiro Ohta、Yuma Morimoto、Hideki Sugimoto、Takashi Ogura、Shinobu Itoh
DOI:10.1002/zaac.201800083
日期:2018.8.2
A copper(I) complex, [CuI(TIPT2aped)(CH3CN)]ClO4 (1), and two copper(II) complexes, [CuII(TIPT2aped)(Cl)]PF6 (2) and [CuII(TIPT2aped)(ClO4)]ClO4 (3), were synthesized and characterized. The reaction of 1 with dioxygen in acetone at –90 °C gave an end‐on superoxide copper(II) complex 4. The superoxide copper(II) complex 4 reacted with 2,2,6,6‐tetramethylpiperidin‐1‐ol (TEMPO‐H) and 2,6‐di‐tert‐butyl‐4‐methoxyphenol
铜(I)络合物[Cu I(TIPT 2 aped)(CH 3 CN)] ClO 4(1)和两种铜(II)络合物[Cu II(TIPT 2 aped)(Cl)] PF 6(合成并表征了[ 2 ]和[Cu II(掺杂了TIPT 2的)(ClO 4)] ClO 4(3)。1在–90°C下与丙酮中的双氧反应生成端基超氧化物铜(II)配合物4。超氧化物铜(II)配合物4与2,2,6,6-四甲基哌啶-1-醇(TEMPO-H)和2,6-二-二甲基反应叔丁基-4-甲氧基苯酚(DTBMP)生成氢过氧化物铜(II)络合物6。这些铜-氧加合物已通过UV / Vis,共振拉曼光谱,EPR和NMR光谱技术进行了全面表征。还在过氧化氢和三乙胺存在下由铜(II)配合物3合成配合物6。4与TEMPO-H的反应显示出较大的动力学氘同位素效应(k H / k D = 5.8)和较大的负活化焓(ΔH ‡)。根据动力学数据,反应机理为4转化为6