title: Effect of gemini (alkanediyl-α,ω-bis(dimethylcetylammonium bromide)) (16-s-16, s=4, 5, 6) surfactants on the interaction of ninhydrin with chromium-glycylphenylalanine.
abstract: The effect of gemini (alkanediyl-α,ω-bis(dimethylcetylammonium bromide)) (16-s-16, s=4, 5, 6) surfactants on the interaction of ninhydrin with chromium(III) complex of glycylphenylalanine ([Cr(III)-Gly-Phe]2+) has been investigated using UV-visible spectrophotometer at different temperatures. The order of reaction with respect to [Cr(III)-Gly-Phe]2+ is unity while it is fractional with respect to ninhydrin. Whereas, the values of rate constant (kψ) increase and leveling-off regions, like conventional single chain cetyltrimethylammonium bromide (CTAB) surfactant, were observed with geminis, later produces a third region of increasing kψ at higher gemini surfactant concentrations. This unusual third-region effect of the gemini micelles is assigned to changes in their micellar morphologies. The results obtained in micellar media were treated in terms of pseudo-phase model. The values of thermodynamic parameters (Ea, ΔH# and ΔS#) and binding constants (KA and KNin) have been evaluated.
authors.affiliation: Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, U.P., India. Electronic address: dileepkmr271@gmail.com.
authors.forename: Dileep
authors.initials: D
authors.lastname: Kumar
authors.affiliation: Chemistry Department, King Abdulaziz University, Jeddah 21589, Saudi Arabia; Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
authors.forename: Malik Abdul
authors.initials: MA
authors.lastname: Rub
authors.affiliation: Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, U.P., India.
authors.forename: Mohd
authors.initials: M
authors.lastname: Akram
authors.affiliation: Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, U.P., India.
authors.lastname: Kabir-ud-Din
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D002857:Chromium / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D004151:Dipeptides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008823:Micelles; D009555:Ninhydrin / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature
chemical_list: D002593:Cetrimonium Compounds; D056831:Coordination Complexes; D004151:Dipeptides; D008823:Micelles; D013501:Surface-Active Agents; D002857:Chromium; C029660:glycylphenylalanine; D009555:Ninhydrin; D000077286:Cetrimonium
keywords: Catalysis; Gemini surfactants; Micelle; Ninhdyrin; [Cr(III)-Gly-Phe](2+)