Elucidating the Structure of Poly(dopamine)

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• 作者：Daniel R. Dreyer ; Daniel J. Miller ; Benny D. Freeman ; Donald R. Paul ; Christopher W. Bielawski
• 刊名：Langmuir
• 出版年：2012
• 出版时间：April 17, 2012
• 年：2012
• 卷：28
• 期：15
• 页码：6428-6435
• 全文大小：377K
• 年卷期：v.28,no.15(April 17, 2012)
• ISSN：1520-5827

文摘

Herein we propose a new structure for poly(dopamine), a synthetic eumelanin that has found broad utility as an antifouling agent. Commercially available 3-hydroxytyramine hydrochloride (dopamine HCl) was polymerized under aerobic, aqueous conditions using tris(hydroxymethyl)aminomethane (TRIS) as a basic polymerization initiator, affording a darkly colored powder product upon isolation. The polymer was analyzed using a variety of solid state spectroscopic and crystallographic techniques. Collectively, the data showed that in contrast to previously proposed models, poly(dopamine) is not a covalent polymer but instead a supramolecular aggregate of monomers (consisting primarily of 5,6-dihydroxyindoline and its dione derivative) that are held together through a combination of charge transfer, 蟺-stacking, and hydrogen bonding interactions.