Li Aoqi, Duan Wanyi, Liu Jianming, Zhuo Kelei, Chen Yujuan, Wang Jianji
Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, P. R. China.
Sci Rep. 2018 Sep 3;8(1):13141. doi: 10.1038/s41598-018-31402-9.
Deep eutectic solvents (DESs), called a new generation of green solvents, have broad applied in synthesis of nanomaterials due to their remarkable physicochemical properties. In this work, we used a unique strategy (adding moderate water (10%) to DES) to effectively prepare nanomaterials. Flower-like AuPt alloy nanoparticles were successfully synthesized using one-step electrochemical reduction method at a low potential of -0.30 V (vs. Pt) and a low temperature of 30 °C. In this process, the DES acted as solvent and shape-directing agent. More importantly, we used the electrode modified with the as-prepared nanomaterials as the anode to the electrochemical oxidation synthesis. The glassy carbon electrode modified with the AuPt nanoflowers was directly employed to the electro-oxidation of xanthene (XT) to xanthone (XO) under a constant low potential of 0.80 V (vs. Ag/AgCl) and room temperature, with a high yield of XO. Moreover, the synthesis process was milder and more environment-friendly than conventional organic syntheses. This new strategy would have a promising application in electroorganic synthesis fields.
深共熔溶剂（DESs）被称为新一代绿色溶剂，因其卓越的物理化学性质而在纳米材料合成中得到广泛应用。在本工作中，我们采用了一种独特的策略（向DES中添加适量水（10%））来有效制备纳米材料。通过一步电化学还原法，在-0.30 V（相对于Pt）的低电位和30°C的低温下成功合成了花状AuPt合金纳米颗粒。在此过程中，DES充当溶剂和形貌导向剂。更重要的是，我们将用所制备的纳米材料修饰的电极用作电化学氧化合成的阳极。用AuPt纳米花修饰的玻碳电极在0.80 V（相对于Ag/AgCl）的恒定低电位和室温下直接用于将呫吨（XT）电氧化为呫吨酮（XO），XO产率很高。此外，该合成过程比传统有机合成更温和、更环保。这种新策略在有机电合成领域将有广阔的应用前景。
