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Exploring Caffeic Acid and Lignosulfonate as Key Phenolic Ligands for Metal-Phenolic Network Assembly
Daniela Tomasetig1,2, Chenyu Wang1, Nikolaus Hondl2
1Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
ACS Omega
|May 13, 2024
Summary
Researchers created novel metal-phenolic network (MPN) films using iron ions and specific plant-based phenols. These new MPN films are degradable and can be used for dyeing hair.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biomaterials
Background:
- Metal-phenolic network (MPN) films are formed through coordinative interactions between metal ions and phenolic compounds.
- Previous studies have extensively explored various combinations for film formation.
Purpose of the Study:
- To investigate the successful formation of MPN films using specific phenolic compounds (caffeic acid, lignosulfonate) and Fe³⁺ ions.
- To compare the film-forming capabilities of different phenolic compounds.
- To characterize the properties and potential applications of the newly formed MPN films.
Main Methods:
- Complexation of Fe³⁺ ions with caffeic acid and lignosulfonate to form MPN films.
- Evaluation of film formation tendency for *p*-coumaryl alcohol, coniferyl alcohol, and sinapyl alcohol.
- Comparison with tannic acid-Fe³⁺ films as a reference.
- Tracking film growth and degradation using UV-vis absorption spectroscopy.
- Characterization of film properties including degradability, capsule formation, color, and wettability.
Main Results:
- Successful formation of MPN films from caffeic acid and lignosulfonate with Fe³⁺.
- Observed limited film formation tendency for *p*-coumaryl alcohol, but none for coniferyl and sinapyl alcohols.
- MPN films exhibited degradability in alkaline environments and with chelators.
- Production of small hollow capsules (3 μm diameter, nanometer thickness).
- Films displayed varied colors and wettability, successfully used for dyeing human hair.
Conclusions:
- Caffeic acid and lignosulfonate are suitable phenolic precursors for Fe³⁺-based MPN film formation.
- The developed MPN films possess tunable properties and are degradable.
- These novel MPN films demonstrate potential applications in areas such as biomaterials and hair dyeing.
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