DETERMINATION OF ASSOCIATION AND DISSOCIATION CONSTANTS OF Co(II), Ni(II), Cu(II), Zn(II), Cd(II) AND Hg(II) METAL ION COMPLEXES WITH 3-(((3-(2-HYDROXYPHENYL)-1-PHENYL-1H-PYRAZOL-4-YL)METHYLENE)HYDRAZONO)INDOLIN-2-ONE.
- Department of Studies and Research in Chemistry, Gulbarga University, Kalaburagi-585106, Karnataka, India.
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The proton-ligand stability constants and metal-ligand stability constants of Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) with 3-(((3-(2-hydroxyphenyl)-1-phenyl-1H-pyrazol-4-yl)methylene)hydrazono)indolin-2-one has been investigated potentiometrically using pH metric technique in aqueous, ethanol-water (50% v/v) and dioxane-water (50% v/v) mixtures at different ionic strengths (0.1 M and 0.2 M) of NaClO4 and at 25 ± 1 oC temperature. Proton-ligand stability constants values fall in the range of 9.642 to 11.751 attributable to ionization of phenolic –OH. The method of Calvin and Bjerrum as adopted by Irving and Rossotti has been employed to determine log K and log ? values.
[Siddappa K and Nabiya sultana M (2016); DETERMINATION OF ASSOCIATION AND DISSOCIATION CONSTANTS OF Co(II), Ni(II), Cu(II), Zn(II), Cd(II) AND Hg(II) METAL ION COMPLEXES WITH 3-(((3-(2-HYDROXYPHENYL)-1-PHENYL-1H-PYRAZOL-4-YL)METHYLENE)HYDRAZONO)INDOLIN-2-ONE. Int. J. of Adv. Res. 4 (Jun). 513-518] (ISSN 2320-5407). www.journalijar.com
