Abstract
A type of thymine (T)-covalently decorated conjugated polymer (P3) with the feature of aggregation-induced emission enhancement (AIEE) was successfully synthesized via Cu-catalyzed click reaction between the acetylene-substituted precursor polymer (P2) and 3′-azido-3′-deoxythymidine. Chemical structures of target polymers were verified by FT-IR and 1H NMR analyses. With the introduction of aqueous Hg2+, fluorescence of P3 in THF–water mixture (VTHF/Vwater=7/3) (buffered with 5mM citric acid–disodium hydrogen phosphate, pH=7.4) displayed gradual enhancement. The AIEE effect was activated by the formation of intermolecular aggregates, which was induced by the formation of T–Hg–T complex between polymer chains. Other common metal ions brought very slight interference for P3's response of Hg2+, and the detection limit of Hg2+ reached ∼15.3nM for such probing system.
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