Title: Highly Selective Fluorescent Sensors for Hg(2+) and Ag(+) Based on Bis-triazole-Coupled Polyoxyethylenes in MeOH Solution
Authors: Hung, Hao-Chih
Cheng, Chi-Wen
Wang, Yu-Yun
Chen, Yu-Jen
Chung, Wen-Sheng
Department of Applied Chemistry
Issue Date: 1-Dec-2009
Abstract: Fluorescent chemosensors 6-9, with variable length polyoxyethylenes between two triazolylmethyl ether units, have been synthesized under "click" conditions in which the bis-triazoles and polyoxyethylenes were used as metal-ion binding sites and the pyrenes as fluorophores. Of the 15 metal ions screened, the fluorescence of chemosensors 6-9 in methanol solution was found to be selectively quenched by only Hg(2+) and Ag(+). In contrast, the fluorescence of control compound 10, a [(triazol-4-yl)methoxymethyl]pyrene, was quenched by only Hg(2+). These results imply that the recognition of Hg(2+) does not need the cooperation of two triazole groups. Binding constants for the interactions of 6-9 with Ag(+) increased as the chain length of the polyoxyethylene increased. Finally, a very high selectivity of compound 9 towards Hg(2+) in aqueous methanol solution was observed. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
URI: http://dx.doi.org/10.1002/ejoc.200900987
ISSN: 1434-193X
DOI: 10.1002/ejoc.200900987
Issue: 36
Begin Page: 6360
End Page: 6366
Appears in Collections:Articles