title: A terbium(III)-complex-based on-off fluorescent chemosensor for phosphate anions in aqueous solution and its application in molecular logic gates.
abstract: 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 (5)D4 excited state to (7)FJ 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.
authors: State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, People's Republic of China.
authors: Ya-Wen
authors: YW
authors: Wang
authors: Shun-Bang
authors: SB
authors: Liu
authors: Yan-Ling
authors: YL
authors: Yang
authors: Peng-Zhi
authors: PZ
authors: Wang
authors: Ai-Jiang
authors: AJ
authors: Zhang
authors: Yu
authors: Y
authors: Peng
mesh_terms: D000838:Anions / Q000737:chemistry*; D002614:Chelating Agents / Q000737:chemistry; D005453:Fluorescence; D008024:Ligands; D010710:Phosphates / Q000737:chemistry*; D013725:Terbium / Q000737:chemistry*
chemical_list: D000838:Anions; D002614:Chelating Agents; D008024:Ligands; D010710:Phosphates; D013725:Terbium
keywords: Tb(III) complex; chemosensor; fluorescence; molecular logic gate; phosphate anions