title: Interaction of α-diimine-chromium(III) complexes with non-ionic surfactant Triton X-100.
abstract: Using either luminescence intensity or lifetime measurements, we have studied the binding interactions of Cr(NN)(3)(3+) (NN=α-diimine ligands) with non-ionic solutions of surfactant p-(1,1,3,3-tetramethylbutyl)phenoxypoly(ethylene glycol), Triton X-100 (TX-100). The titration curves consisted of two curved regions with different slopes. This biphasic behavior of lifetime-TX-100 concentration data revealed the presence of premicellar aggregates at low TX-100 concentration and the formation of normal micelles at high surfactant concentration. The results were analyzed with a model that includes binding of Cr(NN)(3)(3+) (probe) to small premicellar aggregates and to micelles. There is a good correlation between the hydrophobicity of the ligands of Cr(III) complex and the strength of the binding of the complexes to the micelles. A comparison with the binding of Cr(NN)(3)(3+) to sodium dodecylsulfate (SDS) is discussed.
authors.affiliation: INFIQC, Departamento de Físico-Química, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina.
authors.forename: Claudia M
authors.initials: CM
authors.lastname: Bazán
authors.affiliation: INFIQC, Departamento de Físico-Química, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina.
authors.forename: Daniela
authors.initials: D
authors.lastname: Pagliero
authors.affiliation: IQUIOS, Instituto de Química Orgánica de Síntesis, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Argentina.
authors.forename: Alejandra
authors.initials: A
authors.lastname: Suarez
authors.affiliation: INFIQC, Departamento de Físico-Química, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina. Electronic address: gerardoa@fcq.unc.edu.ar.
authors.forename: Gerardo A
authors.initials: GA
authors.lastname: Argüello
mesh_terms: D002857:Chromium / Q000737:chemistry*; D007097:Imines / Q000737:chemistry*; D015394:Molecular Structure; D017830:Octoxynol / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D007097:Imines; D009942:Organometallic Compounds; D013501:Surface-Active Agents; D002857:Chromium; D017830:Octoxynol