Adsorption Behavior of Charged Zinc-Porphyrins at the Water-1,2 Dichloroethane Interface Studied by Potential Modulated Fluorescence Spectroscopy

HIROHISA NAGATANI; RODRIGO A IGLESIAS; DAVID J FERMIN; PIERRE-FRANCOIS BREVET; HUBERT H GIRAULT

JOURNAL OF PHYSICAL CHEMISTRY B

American Chemical Society

Año: 2000 vol. 104 p. 6869 - 6869

1089-5647

span lang="en" style="FONT-SIZE: 12pt; FONT-FAMILY: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">The adsorption properties of ionic fluorescent dyes at the polarized water/1,2-dichloroethane interface were studied by potential modulated fluorescence (PMF) spectroscopy under total internal reflection. Analysis of the frequency-dependent fluorescence associated with modulation of the interfacial concentration of the ionic dyes proved to be a rather sensitive approach for separating interfacial phenomena from bulk responses. The combination of PMF and electrochemical techniques allows to uncover differences in the specific interfacial interactions of tris(2,2-bipyridyl)ruthenium(II) (Ru(bpy)32+), meso-tetrakis(N-ethylpyridyl)porphyrinato zinc-(II) (ZnTMPyP4+), and meso-tetrakis(p-sulfonatophenyl)porphyrinato zinc(II) (ZnTPPS