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Monovalent cation-phenolic crystals with pH reversible crystal transformation.

Conversion of renewable plant polyphenol to advanced materials with tailorable properties and various functions is desirable and challenging. Herein, monovalent cation-phenolic crystals contained K or Na ions are synthesized using plant polyphenol as organic source in alkaline solution. The crystal structure is 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 are tuneable by changing the types of cations. It is found that such polymer crystals exhibit an interesting property of pH reversible crystal transformation. They transform into protonated crystalline form in acidic condition (e.g., pH 2), and back to the cation bound crystalline form in alkaline solution. The crystals further demonstrate diverse applications as excellent antioxidant crystals and heavy metal ion adsorbents.