Abstract
Reaction of nickel with halogenazomercaptophenol (HAMP) {1-(5-fluoro-2-pyridylazo)-2-hydroxy- 4-mercaptophenol, 1-(5-chloro-2-pyridylazo)-2-hydroxy-4-mercaptophenol} in the presence aminophenols (AP): 2-(N,N-dimethylaminomethyl)-4-methylphenol, 2-(N,N-dimethylaminomethyl)-4-ethylphenol studied by the Extraction-Photometric method. A single extraction with chloroform yields 97.1–98.9% nickel (II) in the form of a mixed-ligand complex (MLC). The optimal acidity range, at which the optical density is maximum and constant, is at pHop. 3.3 – 7.8 (pH 2.0 – 9.8). Maximum optical density is achieved within 5-10 minutes. The optimal condition for the formation and extraction of these compounds is (1.10-2.35)×10-3 mol/l concentration of HAMP and (6.31-8.42) ×10-4 mol/l – AP. The molar absorption coefficients of Ni (II) complexes at λmax were calculated by the saturation method and amount to ε610–650 = (1.3-1.7) ×104. MLC in the organic phase are in monomeric form (γ = 0.91-1.09). Newly developed methods for extraction- photometric determination of Ni (II) for use in the analysis of oil and petroleum products Baku.