Synthesis and characterization of a novel cross-linking complex of beta-cyclodextrin-o-vanillin furfuralhydrazone and highly selective spectrofluorimetric determination of trace gallium

摘要

A novel host inclusion complex of cross-linking-polymeric-beta-cyclodextrin-o-vanillin furfuralhydrazone (beta-CDP-OVFH)was synthesized and characterized with IR and ~1H NMR spectra to confirm its structure.A highly selective and sensitive fluorescent determination of trace amounts of gallium was proposed based on the reaction between Ga~(3+)with (beta-CDP-OVFH in acetic acid-ammonium acetate buffer medium of pH 4.10.The maximum excitation and emission wavelengths were 392 and 499 nm, respectively.The linear range of this method was 1.5-330 ngml~(-1)with a detection limit of 0.44 ng ml~(-1).The effect of interferences in the determination of gallium was investigated and the results showed that the same race elements such as Al~(3+)and In~(3+)did not interfere the determination of Ga~(3+)even when their concentration is 100 times of Ga~(3+), the host reagent had quite high capacity of identifying Ga~(3+).This method was successfully applied to the determination of trace amounts of Ga~(3+)in artificial and semiconductor samples.