The Composition and Stability of Co(II), Ni(Ll) and Cu(II)-o-Carboxyphenyl Complexes by pH metric Method in Mixed Solvents | [Journal of Chemical Society of Pakistan • 1981]

Author(s):

1. M.F. EL-SHAHAT: Chemistry Dept., Fac. of Science, Ain Shams University,Abbassia, Cairo,Egypt

2. B.A. EL-SHETARY: Chemistry Dept., Fac. of Science, Ain Shams University,Abbassia, Cairo,Egypt

3. W.H. MAHMOUD: Chemistry Dept., Fac. of Science, Ain Shams University,Abbassia, Cairo,Egypt

Abstract:

Summary: o-Carboxyphenyl azodiethylmalonate was studied pH-metrically in different aqueous organic solvents. The pK1&pK2 were calculated to be 4.81 & 10.97, 5.60 & 12.21 and 5.15 & 11.57 in 50% and 80% aqueous ethanol and 50% aqueous dioxan respectivily. The stability constants of Co(II), Ni(ll) and Cu(II) were also calculated in the same solvents. It was found that copper forms 1:2 complex in all mixed solvents, while nickel and cobalt form 1: 1 complexes. There is a good relation between pK;S and dielectric constant of solvents. The pK&pK of ligand and complexes in water can be obtained graghically.

Page(s): 25-29

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 3, Issue: 1, Year: 1981

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