title: Selective recognition of monohydrogen phosphate by fluorescence enhancement of a new cerium complex.
abstract: Bis(8-hydroxy quinoline-5-solphonate) cerium(III) chloride (Ce(QS)(2)Cl) (L) was synthesized and then used as a novel fluorescent sensor for anion recognition. Preliminarily study showed that fluorescence of L enhanced selectively in the presence of HPO(4)(2-) ion. This enhancement is attributed to a 1:1 complex formation between L and HPO(4)(2-) anion. The association constant of 1:1 complex of L-HPO(4)(2-) was calculated as 3.0×10(6). Thus, L was utilized as a basis for a selective detection of HPO(4)(2-) anion in solution. The linear response range of the proposed fluorescent chemo-sensor covers a concentration range of HPO(4)(2-) from 3.3×10(-7) to 5.0×10(-6) mol L(-1) with a detection limit of 2.5×10(-8) mol L(-1). L showed selective and sensitive fluorescence enhancement response toward HPO(4)(2-) ion in comparison with I(3)(-), NO(3)(-), CN(-), CO(3)(2-), Br(-), Cl(-), F(-), H(2)PO(4)(-) and SO(4)(2-) ions. It was probably attributed to the higher stability of the inorganic complex between HPO(4)(2-) ion and L. The method was successfully applied for analysis of phosphate ions in some fertilizers samples.
authors.affiliation: Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran. ganjali@khayam.ut.ac.ir
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ganjali
authors.forename: Morteza
authors.initials: M
authors.lastname: Hosseini
authors.forename: Zahra
authors.initials: Z
authors.lastname: Memari
authors.forename: Farnoush
authors.initials: F
authors.lastname: Faridbod
authors.forename: Parviz
authors.initials: P
authors.lastname: Norouzi
authors.forename: Hassan
authors.initials: H
authors.lastname: Goldooz
authors.forename: Alireza
authors.initials: A
authors.lastname: Badiei
mesh_terms: D000838:Anions / Q000737:chemistry; D002563:Cerium / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry; D010710:Phosphates / Q000032:analysis* / Q000737:chemistry*; D011804:Quinolines / Q000737:chemistry; D013050:Spectrometry, Fluorescence
chemical_list: D000838:Anions; D056831:Coordination Complexes; D005456:Fluorescent Dyes; D010710:Phosphates; D011804:Quinolines; D002563:Cerium; C037219:quinoline