12276-01-6Relevant articles and documents
Gold electrodes with polyion multilayers and electrostatically bound redox couples
Lowy,Finklea
, p. 1325 - 1335 (2008/10/08)
Self-assembled monolayers of alkane thiols with terminal ionized moieties readily adsorb polyions of the opposite charge to form a bilayer structure. A second polyion layer can be adsorbed electrostatically onto the first polyion layer to yield a trilayer. Ellipsometry suggests that the polyion layers have thicknesses comparable to that of the self-assembled monolayer. Each polyion layer can also electrostatically bind a redox couple, although only certain combinations of polyion and redox couple yield a stable redox wave. The reaction of ferroin and other iron complexes onto an anionic surface (monolayer or trilayer) leads to a pH-sensitive surface redox couple believed to be an oligomer of iron hydroxide. A two-terminal pH sensor of the type described by I. Rubinstein, and Hickman et al. Anals Chent 56, 1135 (1984) is demonstrated using electrostatically bound redox couples.
Multidentate ligand kinetics. VIII. The effect of hydroxide, acetate, and azide complexes of copper(II) in its reaction with ethylenediaminetetraacetate complexes
Margerum, Dale W.,Zabin,Janes
, p. 250 - 255 (2008/10/08)
The kinetics of the reaction of copper(II) with the ethylenediaminetetraacetatozincate(II) and -nickelate(II) complexes are studied in the presence of various anions at 25.0° and an ionic strength of 0.10. From pH 5 to 7, the rate of the exchange reaction
The effect of acetate ion on the reaction between copper(II) and the ethylenediaminetetraacetatonickelate(II) ion
Bydalek
, p. 232 - 235 (2007/12/05)
The kinetics of the substitution reaction between the mono- and diacetate complexes of copper(II) and the ethylenediaminetetraacetatonickelate(II) ion have been studied at several pH values at an ionic strength of 1.25 maintained with sodium perchlorate. The temperature dependence of both forward and reverse rates has been determined. In the forward reaction, the formation of acetate complexes of copper(II) causes a decrease in reaction rate, whereas in the reverse reaction, an increase in reaction rate is observed. These differences are compared to similar exchange systems and discussed in terms of proposed dinuclear reaction intermediates and the rates of loss of water from the hydrated and complexed ions.
Multidentate ligand kinetics. V. Copper(II) and cyclohexylenediaminetetraacetatonickelate(II)
Margerum,Bydalek
, p. 683 - 688 (2008/10/08)
The kinetics of the substitution reaction between the hydrated copper(II) ion and the cyclohexylenediaminetetraacetatonickelate(II) ion are studied from pH 1.5 to 3.5. In contrast to the dominant role of copper ion attack in the similar reaction with ethylenediaminetetraacetatonickelate(II), there is no copper ion attack of cyclohexylenediaminetetraacetatonickelate(II). The reaction is first order in the complex and independent of copper concentration but it is highly pH dependent. The acid dissociation rate constants are resolved. The absence of any copper dependence is attributed to the inability of the ion to form dinuclear iminodiacetate intermediates because of hindered rotation and steric blocking due to the hydrocarbon ring. The proposed mechanism indicates that nickel-nitrogen bond dissociation must be a rate-determining step in these multidentate ligand exchange reactions.