Original Research ARTICLE
A Supramolecular Catalyst Self-assembled from Polyoxometalates and Cationic Pillararenes for the Room Temperature Oxidation of Aldehydes
- 1Tsinghua University, China
- 2Jinan University, China
- 3Peking University, China
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 towards 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 pillararenes (namely, P5A) with ten 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.
Keywords: pillararenes, chromium centered Anderson polyoxometalates, Nanospheres, Supramolecular catalyst, Aldehyde oxidation
Received: 30 Apr 2018;
Accepted: 13 Sep 2018.
Edited by:Soumyajit Roy, Indian Institute of Science Education and Research Kolkata, India
Reviewed by:Lixin Wu, Jilin University, China
Scott G. Mitchell, Instituto de Ciencia de Materiales de Aragón (ICMA), Spain
Carsten Streb, Universität Ulm, Germany
Copyright: © 2018 Zeng, Chen, Tan, Zhang and Wei. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Prof. Jie Zhang, Peking University, Beijing, China, firstname.lastname@example.org
Prof. Yongge Wei, Tsinghua University, Beijing, China, email@example.com