title: Study on the new fluorescence enhancement system of Zn-bis-(trimethylolaminomethane)-4-tert-butyl-disalicylicimine in the presence of beta-cyclodextrin and its analytical application.
abstract: A new bis-Schiff base ligand, bis-(trimethylolaminomethane)-4-tert-butyl-disalicylicimine (HL), was synthesized. The fluorescence intensity of HL-Zn(2+) complex was increased by about 8-fold upon addition of beta-cyclodextrin (beta-CD). The spectrofluorimetric determination of trace amounts of Zn(2+) based on the phenomenon was carried out. The excitation and emission wavelengths are 405 and 465nm, respectively. Under optimal conditions, the fluorescence intensities vary linearly with the concentration of Zn(2+) in the range 0-317 mugl(-1) with a detection limit of 1.0mugl(-1). The interferences of some inorganic ions were described. The method is a selective, sensitive, rapid, and simple analytical procedure for the determination of Zn(2+) in crops. The mechanism for the fluorescence enhancement was also discussed.
authors.affiliation: Department of Chemistry and National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China; College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, PR China.
authors.forename: Tianlin
authors.initials: T
authors.lastname: Yang
authors.forename: Wenwu
authors.initials: W
authors.lastname: Qin
authors.forename: Weisheng
authors.initials: W
authors.lastname: Liu