title: A new and efficient luminescence enhancement system of Eu-N-(3,5-dibromosalicylidene)-2-aminopyridine-1,10-phenanthroline and its application in the determination of trace amounts of europium.
abstract: A sensitive luminescence enhancement system has been developed for the determination of trace amounts of trivalent europium. The luminescence intensity of europium complex with N-(3,5-dibromosalicylidene)-2-aminopyridine (HL) was greatly enhanced after the addition of 1,10-phenanthroline (Phen) in acetonitrile solution. The excitation and emission wavelengths were 274 and 617 nm respectively. Under optimal conditions, the luminescence intensities varied linearly with Eu(3+) concentration in the range of 4.0 × 10(-6)∼2.4 × 10(-5) mol L(-1) with a detection limit of 4.3 × 10(-10) mol L(-1). This method was successfully applied to determine the trace amounts of Eu(3+) in a high purity Gd(2)O(3) matrix and in a mixed lanthanide sample. Energy transfer mechanism and luminescence enhancement of HL-Phen-Eu ternary system were studied. The results indicate that both HL and Phen are good sensitizers for the luminescence of Eu(3+) ions, as energy gap between the lowest triplet level of HL/Phen and the resonant level of Eu(3+) ((5)D(1)) exists around the optimal value (3000 ± 500 cm(-1)). The interference by some other lanthanide ions and common ions were also studied.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Institute of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors.forename: Lijuan
authors.initials: L
authors.lastname: Zhang
authors.forename: Xiaorui
authors.initials: X
authors.lastname: Zheng
authors.forename: Waqar
authors.initials: W
authors.lastname: Ahmad
authors.forename: Yunshan
authors.initials: Y
authors.lastname: Zhou
authors.forename: Yugang
authors.initials: Y
authors.lastname: An
mesh_terms: D000838:Anions; D002412:Cations; D004735:Energy Transfer; D005063:Europium / Q000032:analysis*; D008163:Luminescent Measurements / Q000379:methods*; D009942:Organometallic Compounds / Q000737:chemistry*; D010618:Phenanthrolines / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D013997:Time Factors
chemical_list: D000838:Anions; D002412:Cations; C582219:Eu-N-(3,5-dibromosalicylidene)-2-aminopyridine-1,10-phenanthroline; D009942:Organometallic Compounds; D010618:Phenanthrolines; D012997:Solvents; D005063:Europium; C025205:1,10-phenanthroline