Dendritic Polyoxometalate Hybrids: Efficient and Recoverable Catalysts for Oxidation Reactions

Abstract

Keywords: Dendrimers / Polyoxometalates / Homogeneous catalysis / Oxidation / Sustainable chemistryThe purpose of this microreview is to highlight developments in dendritic polyoxometalate (DENDRI-POM) hybrid materials and their catalytic application in oxidation reactions. To the best of our knowledge, there are no reviews dealing with the design and synthesis of DENDRI-POM hybrids and their use as catalysts. Thus, this article will mainly focus on research carried out in our group, including a brief summary of the work done by others in the field. The context includes[a] IECB-

Dendritic phosphotungstate hybrids efficiently catalyze the selective oxidation of alcohols with H2O2

“…Different from the common organic cations, the dendritic countercation offers a local microenvironment for the PW anion, which may lead to the positive "dendritic effect" on the oxidation. 33,34 More importantly, mixed amino groups (both protonated and free amino groups) modified-organic cations have been reported to fine-tune the redox properties of the PW anions, further promoting the activity and stability of PW-based catalysts. 14,21,35 With these points in mind, we decided to incorporate Keggin-type PW anions into the PAMAM dendrimer by partly protonating the amine groups of the dendritic PAMAM with HPW to prepare a PAMAM dendrimer-hybridized phosphotungstate catalyst (PW-PAMAM).…”

Multi-Tasking POM Systems

“…Several recent reviews have been published covering applications of POMs in heterogeneous catalysis (Long et al, 2007 ; Nlate Jahier and Jahier, 2012 ; Ren et al, 2015 ; Wang and Yang, 2015 ; Patel et al, 2016 ). One area of significant interest in POM-based materials has been the incorporation of POMs into metal-organic frameworks (MOFs) (Du et al, 2014 ).…”

Recent advances in polyoxometalate-based heterogeneous catalytic materials for liquid-phase organic transformations

“…Organic surfactants have been widely used to construct cationic surfactant encapsulated POMs and dendritic POM hybrid catalysts with amphiphilic properties. Several recent reviews have covered the above topic, [156][157][158] thus in this review we only focus on the most recent advances.…”