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Ultra-selective detection of Fe2+ ion by redox mechanism based on fluorescent polymerized dopamine derivativesopen access

Authors
An, TaeukLee, NamhunCho, Hong-JunKim, SeongsooShin, Dong-SikLee, Sang-Myung
Issue Date
Jul-2017
Publisher
ROYAL SOC CHEMISTRY
Citation
RSC ADVANCES, v.7, no.49, pp 30582 - 30587
Pages
6
Journal Title
RSC ADVANCES
Volume
7
Number
49
Start Page
30582
End Page
30587
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/8258
DOI
10.1039/c7ra04107a
ISSN
2046-2069
Abstract
Polydopamine (PDA) is considered as a fluorescent molecule, however, the molecular structure and degree of polymerization that yield the most efficient fluorescence have yet to be identified. Here, we first present the fluorescence origin of polymerized dopamine derivatives (pDA) and their extraordinary behavior on the ultra-selective recognition of Fe2+ ions. Dopamine molecules are polymerized to 5,6-dihydroxyindole-rich pDA in basic conditions, followed by readily oxidizing to indole-5,6-quinone-rich pDA by dropping the pH to strongly acidic conditions. It was clearly demonstrated that oligomeric dopamine molecules were water-soluble with intense fluorescence (F-ODA, n = 3-4), while polymeric dopamine molecules were water-insoluble without fluorescence (PDA, n > 5). Also, F-ODA was dramatically selective to Fe2+ ions contradicting previous studies, and their unique binding mechanism was described through the redox potential analysis.
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