Synthesis and Characterization of a Cu(II) complex using a New Schiff base-Azo Reagent (HTYPIM)

In this study a new organic Schiff base-azo ligand was prepared using two steps the condensation and diazotization reaction, this ligand used for reacting with the copper (II) ion to form a copper complex and determination small amounts of it, the prepared ligand and complex were characterized by UV-Vis, FT-IR, 1HNMR spectra, also measured Molar electrical conductivity for complex. Ion copper (II) was determined by a rapid, sensitive, simple and cheap spectrophotometric method, the copper compound has a molar absorbance of (3.193×105) L.mol-1.cm-1, a Sandel sensitivity of (1.989×10-4) μg.cm-2, and a maximum absorbance of (420) nm, with a limit of detection of (0.0083) μg.mL-1 and a limit of quantitation of (0.027) μg.mL-1, the metal concentration obeys Beer's law within the range (0.04-2) μg.mL-1 with a correlation coefficient value of 0.9994 indicating the degree of linearity of the standard calibration for copper. In the complex, the molar ratio of the metal to the ligand was [1:2], the results indicate that the complex has a high stability constant of )1.8645×108 (mol.L-1, and these results showed that this method was more sensitive, more precise and accurate through the calculation of (Re, Erel, R.S.D) %.