title: Partitioning of quencher ions in the micellar microenvironment of polyoxyethylene nonyl phenol.
abstract: This paper has explored the quenching of fluorescence of the dye safranine T (ST) by the inorganic cations viz Cu2+, Co2+, Ni2+ and Mn2+ in micellar solutions of the surfactant dioxyethylene nonyl phenol (Igepal CO-210), pentaoxyethylene nonyl phenol (Igepal CO-520) and dodecaoxyethylene nonyl phenol (Igepal CO-720). The quenching results have been calculated in light of stern volmer equation (SV) to evaluate the extent of interaction between the fluorophore (ST) and quencher. The average concentration of the quencher ions in the micelle have been determined. The quenching efficiency of ST by inorganic ions in micellar medium is lower than that in aqueous medium. The results show that the ions get partitioned in the micellar medium. The values of the partition coefficient of the ions decrease with increase in HLB value and number of oxyethylene groups in Igepal.
authors.affiliation: Department of Chemistry, Jadavpur University, Calcutta 700032, India.
authors.forename: Sujit Kumar
authors.initials: SK
authors.lastname: Ghosh
authors.forename: Pijus Kanti
authors.initials: PK
authors.lastname: Khatua
authors.forename: Jayanta Kumar
authors.initials: JK
authors.lastname: Ghosh
authors.forename: Subhash Chandra
authors.initials: SC
authors.lastname: Bhattacharya
mesh_terms: D003035:Cobalt / Q000737:chemistry; D004396:Coloring Agents; D003300:Copper / Q000737:chemistry; D005453:Fluorescence; D008345:Manganese / Q000737:chemistry; D008823:Micelles; D009532:Nickel / Q000737:chemistry; D017830:Octoxynol; D010619:Phenazines; D010636:Phenols / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013501:Surface-Active Agents
chemical_list: D004396:Coloring Agents; D008823:Micelles; D010619:Phenazines; D010636:Phenols; D013501:Surface-Active Agents; D003035:Cobalt; D011092:Polyethylene Glycols; D008345:Manganese; D003300:Copper; C025256:nonylphenol; D009532:Nickel; D017830:Octoxynol; C009195:safranine T