A catch-release catalysis system based on supramolecular host-guest interactions

Miao Qi; Benny Kia Jia Chew; Kwai Ga Yee; Zhong Xing Zhang; David J. Young; T. S.Andy Hor

doi:10.1039/c6ra01846g

A catch-release catalysis system based on supramolecular host-guest interactions

Miao Qi, Benny Kia Jia Chew, Kwai Ga Yee, Zhong Xing Zhang, David J. Young, T. S.Andy Hor

Research output: Contribution to journal › Article › peer-review

Abstract

A generic catch-release catalysis system has been designed for the recovery of homogeneous catalysts at the end of a reaction using host-guest interactions. This proof-of-concept system consists of a palladium(ii)-dipyrazole complex bearing an adamantyl (Ad) molecular recognition moiety (guest), and magnetic nanoparticles (MNP) decorated with β-cyclodextrins (β-CD) (host). The density of β-CD on the iron oxide nanoparticles was up to 3.1 × 10^-4 mmol per mg, sufficient to efficiently catch the Ad-adorned Pd catalyst in aqueous methanol at room temperature. Release and recycling of the catalyst was achieved by extraction with methanol. This catch-release system performed well in the Suzuki-Miyaura coupling, but suffers from slow degradation which restricts the number of times that the catalyst and magnetic nanoparticles can be recycled and reused.

Original language	English
Pages (from-to)	23686-23692
Number of pages	7
Journal	RSC Advances
Volume	6
Issue number	28
DOIs	https://doi.org/10.1039/c6ra01846g
Publication status	Published - 2016
Externally published	Yes

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abstract = "A generic catch-release catalysis system has been designed for the recovery of homogeneous catalysts at the end of a reaction using host-guest interactions. This proof-of-concept system consists of a palladium(ii)-dipyrazole complex bearing an adamantyl (Ad) molecular recognition moiety (guest), and magnetic nanoparticles (MNP) decorated with β-cyclodextrins (β-CD) (host). The density of β-CD on the iron oxide nanoparticles was up to 3.1 × 10-4 mmol per mg, sufficient to efficiently catch the Ad-adorned Pd catalyst in aqueous methanol at room temperature. Release and recycling of the catalyst was achieved by extraction with methanol. This catch-release system performed well in the Suzuki-Miyaura coupling, but suffers from slow degradation which restricts the number of times that the catalyst and magnetic nanoparticles can be recycled and reused.",

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