Premium
Effect of Different Solvent Characteristics on the Proton‐Ligand and Sm +3 ‐Ligand Formation Constant of Butanamide‐3‐[2‐[(2‐Hydroxyphenyl Methylene) Amino]Ethylimino]N‐Phenyl(BHPAP) in Mixed Solvents
Author(s) -
Eid Mohammed F.,
Mahmoud Faten Z.
Publication year - 2003
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200300115
Subject(s) - chemistry , protonation , stability constants of complexes , potentiometric titration , equilibrium constant , ligand (biochemistry) , ionic strength , aqueous solution , solvent , methylene , inorganic chemistry , analytical chemistry (journal) , ion , organic chemistry , biochemistry , receptor , electrode
Complexes equilibrium of (BHPAP) with proton and Sm +3 ion has been measured in various mixed aqueous solvents, viz.; methanol‐water, ethanol‐water, acetone‐water and dioxane‐water. Based on potentiometric equilibrium measurements of hydrogen ion concentration at 30 °C, ionic strength 0.1 M KNO 3 and in the above various mixed solvents, the values of protonation constant of BHPAP‐Sm +3 complex have been evaluated. The variation of protonation and stability constants with the inverse of dielectric constant or mole fraction of solvent was studied. Application of Fuoss expression and consideration of electrostatic and non‐electrostatic effects are made to explain the above constants. The solid complexes were isolated for each Pr +3 and Nd +3 ‐BHPAP. Elemental analysis, conductance, infrared spectra, and electronic spectra for these solutions and TG, DTG and DTA measurements characterized these solids. The ligand behaves towards the metal ion as a dibasic tetradentate ligand.