American Chemical Society
am5089346_si_005.cif (34.83 kB)

A Terbium(III)-Complex-Based On–Off Fluorescent Chemosensor for Phosphate Anions in Aqueous Solution and Its Application in Molecular Logic Gates

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posted on 2015-02-25, 00:00 authored by Ya-Wen Wang, Shun-Bang Liu, Yan-Ling Yang, Peng-Zhi Wang, Ai-Jiang Zhang, Yu Peng
A new Tb­(III) complex based on a tripodal carboxylate ligand has been synthesized for the selective fluorescent recognition of phosphate anions, including inorganic phosphates and nucleoside phosphates (e.g., ATP), in Tris buffer solution. The resulting L·Tb complex shows the characteristic emission bands centered at about 495 and 550 nm from the Tb­(III)-centered 5D4 excited state to 7FJ transitions with J = 6 and 5, where the chelating ligand acts only as an “antenna”. Upon the addition of phosphate anions to the aqueous solution of Tb­(III) complex, significant “on–off” fluorescence changes were observed, which were attributed to the inhibition of the “antenna” effect between the ligand and Tb­(III) after the incorporation of phosphate anions. Furthermore, this unique Tb­(III) complex has been successfully utilized to detect phosphate anions with filter papers and hydrogels. Notably, the Tb­(III) complex also can be used for the construction of molecular logic gates with TRANSFER and INHIBIT logic functions by using the above fluorescence changes.