title: Interaction of Fe(III) tetrakis(4-N-methylpyridinium)porphyrin with sodium dodecyl sulfate at submicellar concentrations.
abstract: Interaction of water soluble Fe(III) tetrakis(4- N-methylpyridinium)porphyrin (Fe(III)TMPyP) with sodium dodecyl sulfate (SDS) in submicellar concentrations has been studied by surface tension, optical absorption, resonance light scattering (RLS), zeta-potential, and energy dispersive X-ray spectroscopy (EDS) measurements. Measurements were conducted for a fixed concentration of Fe(III)TMPyP (6 x 10 (-5) M) and SDS in various concentrations ranging between 6 x 10 (-6) and 6 x 10 (-2) M. Two macroscopic phase transitions, precipitation and redissolution, were observed as function of SDS concentration. The presence of a new surface active porphyrin-surfactant complex was detected. Furthermore, the presence of two oppositely charged Fe(III)TMPyP-SDS bulk moieties has been demonstrated. Possible structures for the different moieties are suggested, and the phase transitions are discussed.
authors.affiliation: Department of Chemical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel.
authors.forename: O
authors.initials: O
authors.lastname: Yaffe
authors.forename: E
authors.initials: E
authors.lastname: Korin
authors.forename: A
authors.initials: A
authors.lastname: Bettelheim
mesh_terms: D003102:Colloids / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry; D052203:Ferrosoferric Oxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry; D008823:Micelles; D036103:Nanotechnology / Q000379:methods; D011108:Polymers / Q000737:chemistry; D011142:Polyvinyl Alcohol / Q000737:chemistry; D011166:Porphyrins / Q000737:chemistry*; D012542:Scattering, Radiation; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013696:Temperature
chemical_list: D003102:Colloids; D005290:Ferric Compounds; D008823:Micelles; D011108:Polymers; D011166:Porphyrins; C000499:ferric oxide; D012967:Sodium Dodecyl Sulfate; C021096:tetra(4-N-methylpyridyl)porphine; D011142:Polyvinyl Alcohol; D007501:Iron; D052203:Ferrosoferric Oxide