Rl. Bretz et Hd. Abruna, SYNTHESIS OF ADSORBABLE REDOX-ACTIVE OSMIUM THIOL MONOLAYERS AND THE EFFECTS OF THE WORKING ELECTRODE POTENTIAL DURING DEPOSITION, Journal of electroanalytical chemistry [1992], 388(1-2), 1995, pp. 123-132
A new series of redox-active transition metal complexes of the type [O
s(bpy)(2)Cl(Py-(CH2)(n)-SH)](PF6), with n = 4, 6, or 9, capable of for
ming adsorbed monolayers on gold, platinum and silver electrodes has b
een synthesized and the effect of the working electrode potential duri
ng deposition on the amount of material deposited onto the electrode s
urface has been studied using cyclic voltammetry. The amount of materi
al deposited onto the working electrode at potentials negative of the
potential of zero charge E(pzc) for a given metal electrode depended o
n the potential applied during deposition, but at potentials positive
of E(pzc), the amount deposited was much smaller and virtually indepen
dent of the applied potential. The interaction most dominant in the ad
sorption process of these redox-active species appears to be electrost
atic attraction and repulsion. In addition, this method provides for a
facile way to determine E(pzc) for solid electrodes.