A Supramolecular Catalyst Self-Assembled From Polyoxometalates and Cationic Pillar[5]arenes for the Room Temperature Oxidation of Aldehydes

Frontiers in Chemistry

Kun Chen¹  Jie Zhang¹  Yongge Wei²  Mengyan Zeng³  Junyan Tan³ 

[1] Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, China;Beijing National Lab for Molecular Sciences, Key Lab of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, China;;Key Lab of Organic Optoelectronics &

关键词: pillar[5]arenes;    chromium centered Anderson polyoxometalates;    nanospheres;    supramolecular catalyst;    aldehyde oxidation;   

DOI  :  10.3389/fchem.2018.00457

来源: DOAJ

【 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.

【 授权许可】

Unknown