Synthesis and Characterization of Novel μ-Carbonato Tetranuclear Copper Complexes [(Pip)<sub>4n</sub>Cu<sub>4</sub>X<sub>4</sub>(CO<sub>3</sub>)<sub>2</sub>] in Aprotic Media
Synthesis and Characterization of Novel μ-Carbonato Tetranuclear Copper Complexes [(Pip)<sub>4n</sub>Cu<sub>4</sub>X<sub>4</sub>(CO<sub>3</sub>)<sub>2</sub>] in Aprotic Media作者机构：Chemistry Department Faculty of Science Alexandria University Alexandria Egypt Chemistry Department Faculty of Science University of Jeddah Jeddah Saudi Arabia Chemistry Department Faculty of Science University of Tabuk Tabuk Saudi Arabia
出 版 物：《Open Journal of Inorganic Chemistry》 (无机化学期刊（英文）)
年 卷 期：2016年第6卷第1期
页 面：66-75页
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学]
主 题：Complexes Tetranuclear Cuban Carbonato Bridge Copper
摘 要：In this work, novel oxidative coupling complexes, [(Pip)4nCu4X4(CO3)2] (n = 1 or 2, X = Cl or Br, Pip = piperidine), are synthesized from the reaction of well characterized Lewis base [(Pip)4nCu4X4O2] with carbon dioxide as a Lewis acid in CH2Cl2. These carbonato-derivatives are isolated as stable solids. They are easily soluble in aprotic solvents as CH2Cl2or phNO2. Cryoscopic measurements support tetranuclear structure for all of them. Electronic spectra in the near infrared with high molecular absorptivity may be explained for tetranuclear cuban structure to fulfil 3 halo-ligands for each copper centre in [(Pip)4nCu4X4(CO3)2]. The EPR spectra for [(Pip)4nCu4X4(CO3)2] complexes are axial type of spectra (dx2-y2 G.S) suggesting elongated tetragonal distortion for all of them. Cyclic voltammograms for [(Pip)4nCu4X4(CO3)2] are irreversible in character. These tetranuclear carbonato complexes show catalytical activity. They initiate the oxidation of 2,6-dimethylphenol (DMP) to 3,3’,5,5’-tetramethyl-4,4’-diphenoquinone (DPQ).
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