【摘要】 合成了一种新的席夫碱配体2,4-二羟基苯乙酮缩三羟基甲基氨基甲烷。该配体与铽（Ⅲ）的配合物的荧光强度在磷酸钠或六次甲基四胺的存在下可增强18或26倍。有机溶剂CH₃CN,DMF,丙酮,THF,DMSO,CH₃OH,C₂H₅OH的添加可使其荧光强度进一步增加3～19倍。其中,用CH₃CN作溶剂时荧光增加倍数最大,Tb-HL-HMTM体系荧光最强。pH=6.0时,激发和发射波长分别是355和545nm。在理想情况下,荧光强度与Tb³⁺离子浓度成正比。对于HL-Na₃PO₄-CH₃CN体系,线性范围2.3×10^-10～5.8×10^-5 mol/L,检测限2.0×10^-10 mol/L,对于HL-HMTM-CH₃CN体系,线性范围9.8x10_-11～7.2×10^-5 mol/L,检测限9.0×10^-11 mol/L。基于此对Tb₃₊进行定量测定,该分析方法简单、快速、灵敏、干扰小。同时对荧光增强的机理进行了分析和讨论。更多还原

【Abstract】 A new Schiff base ligand, 2, 4-dihydroxyl-acetophenonetriaminotriethylamine（HL）, was synthesized and its fluorescence intensity with terbium（Ⅲ） increased by about 18 fold in the presenc of sodium phosphate（Na₃PO₄） or increased by about 26 fold in the presenc of hexamethylene tetramine（HM-TM）. And when organic solvents(CH₃CN, DMF, acetone, THF, DMSO, （H₃OH, and C₂H₅OH） were added into the above system, the fluorescence intensities were further enhanced by about 3～19 folds, which was observed to be highest for the Tb-HL-HMTM-CH₃CN system（to be about 500 fold）. The spectrofluorimetric determination of trace amount of Tb³⁺ based on the phenomenon was carried out. The excitation and emission wavelengths are 355 and 545 nm, respectively. Under optimal conditions, the fluorescence intensities vary linearly with the concentration of Tb³⁺ in the range 2.3×10^-10～5.8×10^-5 mol/L with a detection limit of 2.0×10^-1mol/L（for HL-Na₃PO₄-CH₃CN system） or 9.8×10^-11～7.2×10^-5 mol/L with a detection limit of 9.0×10^-11mol/L（for HL-HMTM-CH₃CN system）. The interferences of some rare earth metals and other inorganic ions were described. The method proves to be a selective, sensitive, rapid and simple analytical procedure for the determination of terbium（Ⅲ） in high-purity yttrium oxide and synthetic samples. The mechanism for the fluorescence enhancement was also studied.更多还原