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Title: A cationic porphyrin-based self-assembled film for mercury ion detection
Authors: Fang, Z. 
Liu, B. 
Keywords: Cationic porphyrin
Fluorescence quenching
Issue Date: 31-Mar-2008
Citation: Fang, Z., Liu, B. (2008-03-31). A cationic porphyrin-based self-assembled film for mercury ion detection. Tetrahedron Letters 49 (14) : 2311-2315. ScholarBank@NUS Repository.
Abstract: A cationic 5,15-(p-(9,9-bis(6-trimethylammoniumhexyl)fluorenylethynyl)phenyl)porphyrin tetrabromide was synthesized and the self-assembled films were used for Hg2+ detection in aqueous media. The detection response is based on fluorescence quenching of the porphyrin molecule upon coordination with Hg2+. The detection shows high selectivity for Hg2+ over Cu2+, Zn2+, Pb2+, Cd2+, Mn2+, Ni2+, Co2+ and Ca2+. A linear response toward Hg2+ in a concentration range of 1 × 10-10-1 × 10-6 M was observed for the film with a detection limit of 0.1 nM. The cationic porphyrin film shows higher stability and significant improvement in detection sensitivity, as compared to other porphyrin-based sensors. The amphiphilic cationic nature of the porphyrin synthesized also allows for the direct deposition of a porphyrin layer on a bare glass surface through self-assembly. © 2008 Elsevier Ltd. All rights reserved.
Source Title: Tetrahedron Letters
ISSN: 00404039
DOI: 10.1016/j.tetlet.2008.01.138
Appears in Collections:Staff Publications

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