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Some metal ions can cause the aggregation of fluorescent materials, such as multivalent ions, Hg2+,..
Some metal ions possess paramagnetic properties, thus can have strong quenching ability via electron transfer, such as Cu2+, Fe3+,...
Some metal ions can displace the original ligands on the materials surface, causing the quenching.
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Literatures on Cu detection (quenching):
J. Mater. Chem., 2008, 18, 4636¨C4640 http://pubs.rsc.org/en/Content/ArticleLanding/2008/JM/b810409c

Hg2+ detection (aggregation)
Angew Chem. Int. Ed. 2007, 46, 6824-6828
http://onlinelibrary.wiley.com/d ... .200700803/abstract
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6Â¥: Originally posted by slzhao at 2011-12-10 19:36:16
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