A highly selective chemosensor probe for Ag+ in 50 THF/H_2O

摘要

A highly selective chemosensor for Ag~+ based on heterocyclic compound Diethyl 6-anilino-5H-2,3-dithia-5,7-diazacyclopenta(cd)indene-1,4-dicarboxylate (D1) was investigated. The deprotonation of N-H was observed easily in spectra of D1 (2.5×10~(-5) M) in 50% H_2O/THF solution after NaOH addition, and the deprotonated D1 could interact with Ag+, resulted in the sharp decrease of deprotonated absorption. The addition of other metal ions would not produce an obvious change, which means quite extreme selectivity for Ag+ compared with other metal ions. The LOD of the method to detect Ag+ was 8.07×10~(-8) M. It is indicated that a novel high selective chemosensor for Ag+ was build up.