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A neutral porous organic polymer host for the recognition of anionic dyes in water

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Abstract

Neutral hosts for the recognition of anionic guests in water remain underdeveloped due to the inherent thermodynamic barrier for desolvation. To address this challenge, we have repurposed crosslinked porous organic polymers (POPs) as hosts. This polymer architecture affords a hydrophobic environment with a densely packed array of urea hydrogen bond donors to cooperatively promote anion desolvation and recognition in water. Using the principles of supramolecular design, we demonstrate through adsorption assays that the resulting Urea-POP-1 can recognize structurally different dyes containing phosphonate, sulfonate, and carboxylate anions in water. Moreover, when compared to Methyl-POP-1, a control POP lacking hydrogen bond donors, we find that the driving force for desolvation and adsorption of each dye is achieved through hydrophobic interactions with the POP backbone and, more importantly, cooperative hydrogen bonding interactions with the urea sidechains. This starting point sets the stage to exploit the modularity of our design to build a family of neutral polymer hosts with tunable pore sizes and anion preferences for fundamental investigations and targeted applications.

Graphical abstract: A neutral porous organic polymer host for the recognition of anionic dyes in water

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Supplementary files

Article information


Submitted
25 May 2020
Accepted
19 Jun 2020
First published
19 Jun 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020, Advance Article
Article type
Edge Article

A neutral porous organic polymer host for the recognition of anionic dyes in water

W. S. Y. Ong, R. A. Smaldone and S. C. Dodani, Chem. Sci., 2020, Advance Article , DOI: 10.1039/D0SC02941F

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