Abstract
Near-infrared (NIR) emission can offer distinct advantages for biological applications. A fluorescent sensor, Zinhbo-1, based on bis(benzoxazole) ligand with 2,2'-dipicolylamine (DPA) as receptor, was synthesized. In aqueous solution, Zinhbo-1 demonstrates high sensitivity and selectivity for sensing Zn(2+) with about 10-fold enhancement and nanomolar sensitivity (K(d) = 0.29 nM). Moreover, sensor Zinhbo-1 can detect Zn(2+) in near-infrared region (over 700 nm) with large Stokes shift (ca. 230 nm) attributing to the Zn(2+)-induced excited state intramolecular proton transfer (ESIPT).
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