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A new fluorescent excited state intramolecular proton transfer compound, 2-(2-hydroxy-4-carbaldehydephenyl)benzoxazole (HCPBO), has been synthesized for the detection of Cu 2+ , based on its fluorescence quenching. In molecular monodispersed solution, the recognition selectivity for Cu 2+ was poor as Co 2+ and Ni 2+ gave similar results in fluorescence quenching. However,...
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