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A Supramolecular Catalyst Self-Assembled From Polyoxometalates and Cationic Pillar5arenes for the Room Temperature Oxidation of Aldehydes

机译:自多金属氧酸盐和阳离子柱5芳烃自组装的超分子催化剂在室温下对醛的氧化

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摘要

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.
机译:在自然界和化学工业中,氧化醛以生成羧酸是至关重要的反应。醛氧化是肝细胞中易于实现的过程,在工业生产中对自氧化反应呈惰性,在酶促条件下(在室温,pH为7的水中)很难实现。在这里,我们制备了一种超分子催化剂,它是由以铬为中心的安德森多金属氧酸盐Na3 [CrMo6O18(OH)3](即CrMo6)和带有10个正电荷的阳离子柱[5]芳烃(即P5A)组装在水性介质中的纳米球。用作相转移催化剂(PTC)。该超分子催化剂是在酶条件下以相对较好的转化率进行醛类氧化的研究。通过DLS监测,在改变离子配合物(P5A-CrMo6)的电荷比的同时,纳米球的直径是可变的,这可能是因为电荷比越近导致组装越紧凑。另外,通过TEM和SEM监测纳米形态,并通过ζ电位,X射线能量色散光谱法(EDS),元素分析表征纳米结构。

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