Study on Complex of Re(III) with 3, 5-Br2-DMPAP by Electrochemistry and Application

ABSTRACT

The electrochemical character of a new reagent, 2-(3, 5-Dibrome-2-pyriclyiazo)-5-dimethylaminophenol(3, 5-Br₂-DMPAP) was studied in HAc-NaAc medium at pH=3.50. In single sweep polarography, the reduction potential of the complex wave (-1.05V) is more negative than that of the free ligand(-1.01V). The complex wave was proven to be an adsorption wave. The composition ratio of the complex was formed to be 1:1 using a molar ratio method. The current of the adsorptive peak at-1.05V was directly proportional to the concentration of Re(III) in the range of 1.5× 10^?8～7.0×10^?5mol/l. The microamount of Re in several samples of Chinese cigarettes determined with satisfactory accuracy and precision.