Association of nitrophenols to sodium dodecylsulfate micelles

Journal Article · Sat Nov 01 04:00:00 EST 1997 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1006/jcis.1997.5141· OSTI ID:596996

Senz, A; Gsponer, H E ^[1]

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1. Univ. Nacional de Rio Cuarto (Argentina)

The luminescence quenching of tris(2,2{prime}-bipyridine)ruthenium(II) Ru(bpy){sub 3}{sup 2+} by 2-, 3-, and 4-nitrophenol (NO{sub 2}PhOH), in their protonated forms, has been studied by static and time-resolved techniques in water and sodium dodecyl sulfate (SDS) aqueous solution. In water, the biomolecular rate constants were obtained separately from both techniques and they were coincident. The values were close to the diffusional limit. In the presence of SDS micelles at a fixed detergent concentration, the Stern-Volmer plots of {tau}{sup 0}/{tau} vs quencher total concentration ([Q]{sub t}) were linear in the whole range of [Q]{sub t} used. However, the Stern-Volmer plots of the ratio I{sup 0}/I vs [Q]{sub t} in SDS micelles showed an upward deviating curve. From these plots of I{sup 0}/I, the concentrations of the NO{sub 2}PhOHs in the micellar pseudophase were measured. The treatment of the data of both types of measurements let the authors determine the association constants (K) of the NO{sub 2}PhOHs to SDS micelles and the exit (k{sub {minus}}) and entrance (k{sub +}) rate constants of NO{sub 2}PhOHs to the micelles. The K values obtained from either static or time-resolved luminescence techniques were in agreement within experimental error. An electron-transfer mechanism was also proposed for the quenching reaction of the excited state Ru(bpy){sub 3}{sup 2+} by nitrophenols in which the metallic complex is oxidized.

• OSTI ID: 596996
• Journal Information: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 1 Vol. 195; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
ELECTRON TRANSFER
MICELLAR SYSTEMS
NITROPHENOL
RUTHENIUM COMPLEXES
SOLUBILITY
SURFACTANTS
WASTE WATER
WATER TREATMENT