Metal sensor properties of schiff bases containing triazine derived from 2-hydroxy-1-naphthaldehyde in solution a simple spectrofluorimetric method to determinate mercury(II)

Four new Schiff base ligands carrying naphthalene group were prepared from the reaction of 2,4-diamino-6-methyl-1,3,5-triazine and 2,4-diamino-6-undecyl-1,3,5-triazine with 2-hydroxy-1-naphthaldehyde. The influence of metal ions such as Cu2+, Co2+, Hg2+, Al3+, Cr3+, Fe3+, Pb2+, Ni2+, Cd2+, Zn2+, Mn2+, Ag+, Ba2+, Ca2+ and Mg2+ on the spectroscopic properties of the ligands was investigated by means of absorption and emission spectrometry. The results of spectrophotometric and spectrofluorimetric titrations disclosed the complexation stoichiometry and complex stability constant of the ligands with metalions. A simple spectrofluorimetric method was developed using the Schiff base derived from 2,4-diamino-6-undecyl-1,3,5-triazine to determination of Hg2+ ion. No cleanup or enrichment of the solutions was required. A modified standard addition method was used to eliminate matrix effect. The standard addition graph was linear between 0.2 and 2.6 mg/L in determination of Hg2+. Detection and quantification limits were 0.08 and 0.23 mg/L, respectively. The simple and cost-effective is suitable for determination of mercury content of water samples. Key Words:Triazine, Fluorescence spectroscopy, 2-Hydroxy-1-naphthaldehyde, Schiff base, Mercury determination