Abstract
A perylene bisimide derivative (PBI-Lac-DPA) with lactose and DPA moiety conjugates was synthesized, and this compound exhibited fluorescence turn-on sensing for Cd2+ ions in an aqueous solution with a binding constant of (6.0 ± 0.3) × 104 M−1, and detection limit of 5.2 × 10-7 M. PBI-Lac-DPA exhibited high selectivity for the Cd2+ ion with a 2:1 binding stoichiometry between PBI-Lac-DPA and Cd2+ ions due to the additional coordinating sites in the self-assembly process of PBI-Lac-DPA itself. Furthermore, PBI-Lac-DPA exhibited fluorescence enhancement upon complexation with the Cd2+ ion in living cells. This work explored a new method for increasing the selectivity for Cd2+ ions via the enhanced additional complex sites of the DPA moiety from self-assembly process.
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