Abstract
The complexing ability of some water-soluble azo dyes towards copper(II) and zinc(II) were studied in 0.1 M sodium perchlorate and perchloric acid solutions, at 25.0 °C. Solutions with CM≫CL, where CM is the concentration of metal and CL the concentration of ligand, and CL≫CM(CM up to 10–3M, CL up to 2 × 10–4M and pH up to the precipitation of metal hydroxides) were investigated spectrophotometrically.The ligands T-azo-C and 3,6-disulpho-TAN are able to complex both copper(II) and zinc(II), but amaranth only copper(II). Besides the usual complexes having 1:1 metal to ligand molar ratios, a 2:1 complex has been detected in the system copper(II)- T-azo-C. The results are compared with others obtained previously. The copper(II) complexes are much more stable than those of zinc(II) and those of many other metal ions. Therefore, a method is proposed for the spectrophotometric determination of copper(II), which is almost free from interferences.
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