- 作者: Atef A. T. Ramadan; Salah B. El-Maraghy; Mohammed S. Abdel-Moez; Ali M. Taha
- 作者服務機構: Falcuty of Education Ain Shams University, Roxy Cairo (Egypt)
- 中文摘要: Complex equilibria of DCPHD with proton and Ni/sub 2+/, Sm/sub 3+/-, and Yb/sub 3+/ ions has been measured in various mixed aqueous solvents, viz: isopropanol-water, acetone-water, ethanol-water, and methanol-water. Based on potentiometric equilibrium measurements of hydrogen ion concentration at 30.degree.C, ionic strenght 0.10M (KNO/sub 3/) and in the above various mixed aqueous solvents, the values of the protonation constants of DCPHD and the stability constants of DCPHD with Ni/sub 2+/, Sm/sub 3+/-, and Yb/sub 3+/ have been evaluated. The variation of protonation and stability constants with the inverse of dieletric constant or mole fraction of the solvent was studied. Application of Fuoss expression and consideration of electrosatic and non-electrostatic effects are made to explain the values of the constants.
- 英文摘要: --
- 中文關鍵字: 5,5-dimethylcyclohexane-2-(2-hydroxyphenyl)hydrazono 1,3-dione; Protonation; Stability constants; Lanthanide ions; nickel ion.
- 英文關鍵字: 5,5-dimethylcyclohexane-2-(2-hydroxyphenyl)hydrazono 1,3-dione; Protonation; Stability constants; Lanthanide ions; nickel ion.