Physico-analytical studies on some heterocyclic azo dyes and their metal complexes with some transition metals

BMC Chemistry

Khalid A. Abdel-Mageed¹  Fathy A. El-Seify¹  Farid I. El-Dossoki²  Hassan A. Azab³  Fikrea S. Degedy³ 

[1] Chemistry Department, Faculty of Engineering, Port Said University;Chemistry Department, Faculty of Science, Port Said University;Chemistry Department, Faculty of Science, Suez Canal University;

关键词: Heteroaromatic amines;    Azo dye;    Spectrophotometric;    Chromogenic reagents;   

DOI  :  10.1186/s13065-022-00833-x

来源: DOAJ

【 摘 要 】

Abstract 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.

【 授权许可】

Unknown