A Supramolecular Catalyst Self-Assembled From Polyoxometalates and Cationic Pillar[5]arenes for the Room Temperature Oxidation of Aldehydes.
A Supramolecular Catalyst Self-Assembled From Polyoxometalates and Cationic Pillar[5]arenes for the Room Temperature Oxidation of Aldehydes.
复制标题
多金属氧酸盐和阳离子柱[5]芳烃自组装超分子催化剂用于醛的室温氧化
DOI：
10.3389/fchem.2018.00457
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发表时间：
2018
影响因子：
5.5
通讯作者：
Wei Y
中科院分区：
文献类型：
--
作者：
Zeng M;Chen K;Tan J;Zhang J;Wei Y
醛氧化生成羧酸是自然界和化学工业中的重要反应。醛氧化是肝细胞中容易实现的过程，在工业生产中对自氧化是惰性的，并且在酶促条件下（在水中，在pH 7下，在室温下）难以实现。本文以铬为中心的安德森多氧杂多酸盐Na 3 [CrMo 6 O 18（OH）3]（即CrMo 6）和带10个正电荷的阳离子柱[5]芳烃（即P5 A）在水介质中组装成纳米球的超分子催化剂，可用作相转移催化剂（PTC）。将该超分子催化剂应用于酶促条件下醛的氧化反应，获得了较好的转化率。通过DLS监测发现，随着离子复合物（P5 A-CrMo 6）的电荷比的变化，纳米球的直径也随之变化，这可能是因为电荷比越接近，组装越紧密。通过TEM和SEM对纳米形貌进行了表征，并通过zeta电位、X射线能谱（EDS）和元素分析对纳米结构进行了表征。
Oxidizing aldehydes to generate carboxylic acids is a crucial reaction in nature and in chemical industry. The aldehyde oxidation, an easily achieved process in liver cells, is inert toward autoxidation in industrial production and difficultly achieved under enzymatic condition (in water, at pH 7, at room temperature). Herein, we prepared a supramolecular catalyst which are nanospheres assembled in aqueous media by chromium centered Anderson polyoxometalates Na3[CrMo6O18(OH)3] (namely, CrMo6) and cationic pillar[5]arenes (namely, P5A) with 10 positive charges which can be used as the phase transfer catalysts (PTCs). This supramolecular catalyst was exploited on aldehydes oxidation under enzymatic condition with relatively good conversion. Through DLS monitoring, the diameters of nanospheres were variable while changing the charge ratios of the ionic complexes (P5A-CrMo6), and it is probably because of the closer charge ratios causing the more compact assemblies. Also, the nano-morphologies were monitored by TEM and SEM, and the nanostructures were characterized by zeta potential, the X-ray energy-dispersive spectroscopy (EDS), elemental analysis.