Journal
ORGANIC LETTERS
Volume 5, Issue 22, Pages 4065-4068Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol035484t
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[GRAPHIC] Compounds 1 and 2 were designed as fluorescent chemosensors for Cd(II). For both, a selective determination of Cd(II) over Zn(II) was achieved. The fluorescence emission of both was pH-independent and switched off between pH 3-11 in 100% water. Whereas the recognition of Cd(II) at pH 7.4 gave rise to the formation of charge-transfer complexes (exciplexes) for both (lambda(max) ca. 500 and 506 nm, respectively), the recognition of Zn(II) only switched on the (monomeric) anthracene emission of 2, while for 1 it was red-shifted (lambda(max) = 468 nm).
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