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首页> 外文期刊>Catalysis science & technology >Copper(i) oxide nanoparticle-mediated C-C couplings for synthesis of polyphenylenediethynylenes: evidence for a homogeneous catalytic pathway
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Copper(i) oxide nanoparticle-mediated C-C couplings for synthesis of polyphenylenediethynylenes: evidence for a homogeneous catalytic pathway

机译：铜(i)氧化nanoparticle-mediated碳碳联轴器的合成polyphenylenediethynylenes:证据均相催化途径

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摘要

During the last few decades, substantial attention has been devoted to copper and copper oxide nanocatalysts, due to copper's natural abundance, low cost and lower toxicity in comparison to precious metal-based nanoparticles. Cuprous oxide (Cu2O) nanoparticles show versatility in catalyzing and mediating carbon-carbon (C-C) and carbon-heteroatom (e.g., C-N, C-O, C-S and C-Se) bond-forming reactions. Here, we demonstrate Cu2O nanoparticle-mediated oxidative C-C homocoupling reactions for the synthesis of polyphenylenediethynylenes under ligandless conditions, mild base and atmospheric air as the oxidant, with reasonable yields and moderate number-average molecular weights. Also, we demonstrate that, during the reaction, Cu2O nanoparticles undergo substrate-induced leaching to form homogeneous copper catalytic species. The leaching of catalytic species and in situ formation of copper complexes are characterized by electrospray ionization mass spectrometry, ultraviolet-visible extinction spectroscopy, transmission electron microscopy and reactor study. The results confirm the contribution of a homogeneous catalytic pathway for the oxidative C-C homocoupling reactions under the reaction conditions used.
机译：在过去的几十年里,大量的关注一直致力于铜和氧化铜吗nanocatalysts,由于铜的自然丰度,相比,低成本和较低的毒性珍贵的金属纳米粒子。(Cu2O)纳米颗粒显示多功能性催化与协调碳碳(碳碳)和杂原子(如碳氮、切断、c和C-Se)bond-forming反应。nanoparticle-mediated氧化碳碳homocoupling反应合成的polyphenylenediethynylenes ligandless下条件下,温和的基地和大气氧化剂,合理的收益率和温和相对分子量。证明,在反应,Cu2O纳米粒子进行substrate-induced浸出形成均匀的铜催化物种。浸出的催化物种和原位铜配合物为特征的形成通过电喷雾质谱,紫外-可见光谱灭绝、透射电子显微镜和反应堆研究。均相催化氧化的途径碳碳homocoupling反应下的反应条件下使用。

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