African Journal of
Pure and Applied Chemistry

  • Abbreviation: Afr. J. Pure Appl. Chem.
  • Language: English
  • ISSN: 1996-0840
  • DOI: 10.5897/AJPAC
  • Start Year: 2007
  • Published Articles: 368

Full Length Research Paper

Binding pattern of ferrocyphen upon interaction with cetyltrimethyl ammonium bromide in the presence of urea

Olaseni Segun Esan1* Christopher Olumuyiwa Aboluwoye1, Nurudeen Abiola Oladoja1; Jide Ige2, Olanrewaju Owoyomi2 and Grace Olufunmilayo Ogunlusi2
1Department of Chemistry and Industrial Chemistry, Adekunle Ajasin University, Akungba Akoko Nigeria. 2Department of Chemistry, Obafemi Awolowo University Ile-Ife Nigeria.
Email: [email protected]

  •  Accepted: 21 September 2008
  •  Published: 30 September 2008


Cetyltrimethylammonium bromide (CTABr) have been titrated against Ferrocyphen (Dicyano-bis-(1, 10-phenanthroline) iron II complex) in aqueous solution as a function of urea concentration which gave a sigmoidal binding isotherm. A simple method was introduced for resolution and characterization of binding set on the basis of binding capacity concept to give hill coefficient > 1.0. Hill coefficient greater than one are the experimental hall mark of cooperativity in which initial binding events render subsequent binding events more favorable. The degree of cooperativity is sensitive to the concentration of urea. The results are interpreted in terms of dielectric constant and decrease in the hydrophobic interaction between the complex (ferrocyphen) and the surfactant monomers.


Key word: Binding isotherm, surfactant, cooperativity, hydrophobic ferrocyphen, binding capacity.