Monovalent cation–phenolic crystals with pH-driven reversible crystal transformation

Ranwen Ou, Jing Wei, Chen Zhao, Qinfen Gu, Haijin Zhu, Xingya Li, Nhi Sa Nguyen, Li Wan, Maria Forsyth, Huanting Wang

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1 Citation (Scopus)

Abstract

The conversion of renewable plant polyphenol to advanced materials with tailorable properties and various functions is desirable and challenging. In this work, monovalent cation-phenolic crystals contained K+ or Na+ ions were synthesized by using plant polyphenol as an organic source in alkaline solution. The crystal structure was resolved, showing a laminar crystal structure with M+ as connecting nodes. The morphologies (e.g., rod-like and spindle-shaped) and chemical compositions of crystals could be tuned by changing the cations. Interestingly, these polymer crystals exhibited a pH-driven reversible crystal transformation. They transformed into their protonated crystalline form under acidic conditions (e.g., pH 2) and went back to the cation-bound crystalline form in alkaline solutions. Furthermore, the crystals proved excellent antioxidants and heavy metal ion adsorbents.

Original languageEnglish
Pages (from-to)12281-12287
Number of pages7
JournalChemistry - A European Journal
Volume25
Issue number53
DOIs
Publication statusPublished - 20 Sep 2019

Keywords

  • cations
  • crystal engineering
  • pH dependence
  • polymer crystal
  • tannic acid

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