19980-54-2Relevant academic research and scientific papers
Substituent Effects on Stability of Complexes of Iron(III), Cobalt(II), Nickel(II) and Copper(II) with Azocresols
Masoud, Mamdouh S.,Elnahas, H. M.,Khalil, E. A.
, p. 347 - 348 (2007/10/02)
The complex formation between substituted azocresols and iron(III), cobalt(II), nickel(II) and copper(II) have been studied potentiometrically in 50percent (v/v) aq ethanol at 25 deg C and μ=0.1.The stability constants of the complexes follow Irving-Willi
Acid Dissociation Constants of Some 2-Hydroxy-5-methyl-4-Substituted-azobenzenes and Formation Constants of Their Chelates with Iron(III), Cobalt(II), Nickel(II) and Copper(II)
Masoud, Mamdouh S.,Osman, M. M.,Salem, T. M.,Khalil, E. A.
, p. 584 - 587 (2007/10/02)
Acid dissociation constants, pKa, are reported for a set of 2-hydroxy-5-methyl-4-substituted azobenzenes in 50percent (v/v) ethanol medium at 25+/-0.1 deg C and μ = 0.1.The substituent and the solvent, beside the pH are found to affect the tautomeric phenomena in the ligands.The ligands form 1:1 and 1:2 complexes in solutions.The pK values of the complexes have been evaluated spectrophotometrically.The complexes have been isolated in the solid state and characterized on the basis of elemental analyses, infrared and electronic spectral data.The solid complexes exist in the octahedral spatial configuration.
