Kinetics of the base hydrolysis of iron (II) complexes with pyridyl–quinolyl Schiff base ligands in aqueous and aqueous/methanol binary mixtures

Autor: Ahmad Desoky M. Mohamad, Mohamed Shaker S. Adam, M. J. A. Abualreish
Rok vydání: 2015
Předmět:
Zdroj: Journal of the Iranian Chemical Society. 12:1521-1528
ISSN: 1735-2428
1735-207X
DOI: 10.1007/s13738-015-0622-z
Popis: Kinetics of the reactivity against OH− ion of some novel bis-N,N′,N″-(pyridin-2-ylmethylene-quinolin-8-yl) Schiff base iron (II) iodide (1), bis-N,N′,N″-[(1-pyridin-2-yl-ethylidene)-quinolin-8-yl] Schiff base iron (II) iodide (2) and bis-N,N′,N″-[(phenyl-pyridin-2-ylmethylene)-quinolin-8-yl] Schiff base iron (II) iodide (3) have been studied spectrophotometrically. A relevant tentative mechanism was suggested with respect to the rate law of the base hydrolysis in aqueous media and aqueous/methanol binary mixtures. The reaction revealed pseudo first-order kinetics with a rate law k obs = k 2[OH−]. The rate trends and activation parameters are consistent with the complexes’ stability discussed according to the hydrophobicity/hydrophilicity of the substituent groups (R) in the complexes. The co-organic solvent, i.e., methanol, has a positive impact on the rate of base hydrolysis.
Databáze: OpenAIRE
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