Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 53, Pages 12281-12287Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201902756
Keywords
cations; crystal engineering; pH dependence; polymer crystal; tannic acid
Categories
Funding
- Australian Research Council [DP150100765]
- National Natural Science Foundation of China [21701130]
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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.
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