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Spectroelectrochemical Investigations of the Spreading of 4‐Pentadecyl Pyridine onto the Au(111) Electrode
Author(s) -
Sagara Takamasa,
Zamlynny Vlad,
Bizzotto Dan,
Mcalees Alan,
Mccrindle Robert,
Lipkowski Jacek
Publication year - 1997
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.199700024
Subject(s) - chemistry , pyridine , electrode , adsorption , desorption , point of zero charge , molecule , electrochemistry , monolayer , inorganic chemistry , electrode potential , analytical chemistry (journal) , organic chemistry , biochemistry
The adsorption of 4‐pentadecyl‐pyridine (C15‐4‐Py) onto the Au(111) electrode was investigated with the help of electrochemical and spectroscopic techniques. Electrochemical studies demonstrated that a film of C15‐4‐Py spreads onto the metal surface at potentials close to the potential of zero charge (pzc) and desorbs from the electrode surface at potentials which are sufficiently negative. The character of C15–4‐Py adsorption resembles adsorption of pyridine molecules at the Au(111) electrode, indicating that the film properties are to a large extent determined by the interaction between the pyridine moiety and the metal surface. Addition of 25 mol%) of 10‐decyl‐9‐[2‐(4‐pyridyl)ethyl]anthracene(DPEA), a dye molecule, to the C15–4‐Py film only slightly modified its properties but allowed the use of spectroscopic methods to study the film properties. Fluorescence spectroscopy and light scattering experiments were employed to study the potential‐induced desorption and adsorption of the surfactant molecules. Using spectroelectrochemical techniques we have demonstrated that the desorption of the film and its readsorption involves the formation of micelles in the subsurface region and spreading of the micelles onto the electrode surface. A general mechanism of spreading of insoluble surfactants onto electrode surfaces has been proposed.