Thermodynamic parameters of phenylglycine interaction with UO22+, La3+ and Zr4.

Phenylglycine interactions with (UO22+, La3+ and Zr4+) transition metal ions were studied at different ionic strengths and different temperature degrees applying Bjerrum's method. The work determine and discuss both the thermodynamic stabilities and the degree of interactions [Formula: see text]. Also the work calculate and discuss the thermodynamic parameters of interactions of phenylglycine with (UO22+, La3+ and Zr4+). The variables that govern the interaction between phenylglycine and the metal ions under investigation were related to the nature of the amino acid reactive species as well as to the nature of M+ such as the valence and radius of the ion. It was observed that reactions between the M+ and L- were the most likely to occur. It was determined that the pH values affect the degree of complex formation [Formula: see text] as well as the production of various reactive spices. When the range of degree of interaction was more than 0.5 and less than 1.15, forming 1:1 stoichiometric complex. Additionally, it was shown that the stability of the complexes produced between phenylglycine and MZ+ increased in the subsequent order, which was in good accord with the Irving-Williams order.

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

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.