Thermodynamics of Adsorption of Redox-Active Self-Assembling Monolayers of Transition-Metal Complexes

Acevedo, David; Bretz, Richard L.; Tirado, J.; Abruña, Héctor D.

doi:10.1021/la00016a053

Cited by 55 publications

(64 citation statements)

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“…Similar frequency responses to those obtained in KClO 4 solutions were obtained for the adsorption from aqueous 0.10 M KPF 6 and KNO 3 solutions. The changes in frequency, which are defined as the difference between the initial frequency (before the injection of the Os complex) and that at steady state, are summarized in Table 1.…”

Section: Resultssupporting

confidence: 78%

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In Situ Quartz Crystal Microbalance Study of Self-Assembly and Mass Transfer Processes of a Redox-Active Osmium Complex

Takada

Abruña

1996

J. Phys. Chem.

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The adsorption process of the redox-active self-assembling molecule [Os(bpy) 2 (pydpy)Cl] + (bpy ) 2,2′-bipyridine and (pydpy) ) trans-1,2-bis(4-pyridyl)ethylene) onto a Pt electrode has been investigated in aqueous KClO 4 , KPF 6 , and KNO 3 electrolyte solutions using the quartz crystal microbalance in conjunction with cyclic voltammetry. In all the electrolyte solutions examined, the adsorption of the Os complex appears to be accompanied by water molecules, whose number is higher in KPF 6 solution (38-41) than in KClO 4 (26-34). In KNO 3 solutions the hydration number increases with increasing surface coverage of the Os complex. The mass transfer during the redox reaction of the adsorbed Os complex monolayer is of the anion exchange type in all the electrolyte solutions examined. Further, it was determined that the anions are accompanied by water molecules, whose numbers (for surfaces at saturation coverage of the Os complex) in a KPF 6 solution (6-7) were higher than in the other electrolyte solutions. At surface coverage values below saturation, only 0-0.5 water molecules accompany the anions. Additionally, we also demonstrate that the film properties do not change during the self-assembly or redox processes of the Os complex, as determined by means of admittance measurements of the quartz crystal resonator on the basis of the electrical equivalent circuit.

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Section: Resultssupporting

confidence: 78%

“…Similar experiments were performed using KPF 6 and KNO 3 as supporting electrolytes to study the effects of different anions on the adsorption of the Os complex. Similar frequency responses to those obtained in KClO 4 solutions were obtained for the adsorption from aqueous 0.10 M KPF 6 and KNO 3 solutions.…”

Section: Resultsmentioning

confidence: 99%

In Situ Quartz Crystal Microbalance Study of Self-Assembly and Mass Transfer Processes of a Redox-Active Osmium Complex

Takada

Abruña

1996

J. Phys. Chem.

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“…A similar situation was observed in the adsorption, from very low solution concentration, of redox-active self-assembling monolayers of Os complexes onto a Pt surface. 22 Microscopically, this would suggest that a certain local concentration of the adsorbate must be reached prior to adsorption. From Table 2, one can see that to increases with a decrease in PLAz concentration, which is consistent with the above argument.…”

Section: Thermodynamics Of Adsorption For An Adsorptionmentioning

confidence: 99%

Adsorption Dynamics of a Phospholipase A2 onto a Mercury Electrode Surface

Chen¹,

Abruña²

1995

J. Phys. Chem.

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Rapid cyclic voltammetry has been employed to investigate the electrochemical behavior of porcine pancreatic phospholipase A2 (PLA2) adsorbed onto a hanging mercury drop electrode surface. The electrochemical response of PLA2 exhibits a pair of voltammetric peaks which are ascribed to the reductiodoxidation of cystinekysteine residues within the enzyme strongly adsorbed on mercury surfaces over the pH range of 0.77-8.50. Based on theoretical fits to the data, the adsorption process, under all experimental conditions, is found to be kinetically controlled. In addition, the adsorption appears to be consistent with a Frumkin adsorption isotherm with a small repulsive interaction. Both pH and temperature have a dramatic effect on the adsorption behavior in terms of the adsorption rate, equilibrium coverage, and molecular conformation. Introductionof the effects of sweep rate, concentration, pH, and temperature,

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“…The formation of SAMs on the surface of gold mainly relies on the strong chemisorption of the adsorbate molecule containing sulfur functional groups, such as thiol, disulfide, and sulfide to the Au surface through the Au-thiolate bond formation. Recently, several research groups have used various techniques to study the kinetics of alkanethiol adsorption onto Au from liquid solution, such as quartz crystal microbalance (QCM) [5,6], atomic force microscope (AFM) [7], reflection absorption infrared spectroscopy [8], surface plasmon resonance (SPR) [9], second harmonic generation [10] and electrochemical methods [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Study of the adsorption kinetics of thiol-derivatized porphyrin on the surface of gold electrode

Zuo¹,

Liu²,

Yang³

et al. 2007

Journal of Electroanalytical Chemistry

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Thermodynamics of Adsorption of Redox-Active Self-Assembling Monolayers of Transition-Metal Complexes

Cited by 55 publications

References 0 publications

In Situ Quartz Crystal Microbalance Study of Self-Assembly and Mass Transfer Processes of a Redox-Active Osmium Complex

In Situ Quartz Crystal Microbalance Study of Self-Assembly and Mass Transfer Processes of a Redox-Active Osmium Complex

Adsorption Dynamics of a Phospholipase A2 onto a Mercury Electrode Surface

Study of the adsorption kinetics of thiol-derivatized porphyrin on the surface of gold electrode

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