In this investigation the azo dyes prepared through diazotizing 3-phenyl-5-aminopyrazole (PAP) and coupling the resulting diazonium salt with Schäffer acid [2-(3‛-phenyl-5‛-pyrazolyl azo) Schäffer acid (la)] and resorcinol [2-(3‛-phenyl-5‛ -pyrazolyl azo) resorcinol (Ib)]. These compounds are used as chromogenic reagents for the spectrophotometric determination of copper, nickel, cobalt and zinc. The conditional acid dissociation constants of these azo dyes (la, Ib) and the stability constants of its metal ion complexes have been determined by spectroanalytical methods. The molar absorptivity and Sandell's sensitivity values of the complexes have been evaluated. The stability constants of the formed complexes have been determined. This will be the subject of future studies concerning the biotechnological applications of our results in the effort to obtain possible new anticancer drugs.
In this investigation, the azo dyes; 2-(3′-phenyl-5′-pyrazolyl azo) schaffer acid (la) and 2-(3′-phenyl-5′-pyrazolyl azo) resorcinol (Ib); were prepared through diazotizing 3-phenyl-5-aminopyrazole (PAP) and coupling the resulting diazonium salt with Schäffer acid and resorcinol respectively. The prepared azo dyes are characterized using both IR spectra and the elemental analysis (C, H, N and S). The prepared azo dyes are used as chromogenic reagents for the spectrophotometric determination of copper (II), nickel (II), cobalt (II) and zinc (II) ions. The conditional acid dissociation constants of these azo dyes (la and Ib) and the stability constants of its metal ion complexes have been determined by spectro-analytical methods. The effect of pH, time, organic solvent and the foreign ions on the spectrophotometric determination of these ions and their complexes with the azo dyes under study were studied. The stoichiometric ratio (M:L) of the formed complexes was also determined. The molar absorptivity, the Sandell's sensitivity values, the obeyance of Beers law and the stability constants of the formed complexes have been also determined and discussed.
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