期刊
TETRAHEDRON LETTERS
卷 49, 期 14, 页码 2311-2315出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2008.01.138
关键词
cationic porphyrin; fluorene; fluorescence quenching; mercury; self-assembly
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 x 10(-1)-1 x 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. (C) 2008 Elsevier Ltd. All rights reserved.
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