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Piper A, Corrigan DK, Mount AR. An electrochemical comparison of thiolated self‐assembled monolayer (SAM) formation and stability in solution on macro‐ and nanoelectrodes. ELECTROCHEMICAL SCIENCE ADVANCES 2021. [DOI: 10.1002/elsa.202100077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Andrew Piper
- EaStCHEM, School of Chemistry The University of Edinburgh Edinburgh UK
| | - Damion K. Corrigan
- Department of Biomedical Engineering University of Strathclyde Glasgow UK
| | - Andrew R. Mount
- EaStCHEM, School of Chemistry The University of Edinburgh Edinburgh UK
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2
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Ilimbi D, Buess‐Herman C, Doneux T. Chronopotentiometry as a Sensitive Interfacial Characterisation Tool for Peptide Aptamer Monolayers. ELECTROANAL 2019. [DOI: 10.1002/elan.201900285] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Diane Ilimbi
- Chemistry of Surfaces, Interfaces and Nanomaterials, Faculté des SciencesUniversité libre de Bruxelles (ULB) Boulevard du Triomphe 2, CP 255 B-1050 Bruxelles Belgium
| | - Claudine Buess‐Herman
- Chemistry of Surfaces, Interfaces and Nanomaterials, Faculté des SciencesUniversité libre de Bruxelles (ULB) Boulevard du Triomphe 2, CP 255 B-1050 Bruxelles Belgium
| | - Thomas Doneux
- Chemistry of Surfaces, Interfaces and Nanomaterials, Faculté des SciencesUniversité libre de Bruxelles (ULB) Boulevard du Triomphe 2, CP 255 B-1050 Bruxelles Belgium
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3
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Alligrant TM, Dasari R, Stevenson KJ, Crooks RM. Electrocatalytic Amplification of Single Nanoparticle Collisions Using DNA-Modified Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11724-11733. [PMID: 26457645 DOI: 10.1021/acs.langmuir.5b02620] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Here we report on the effect of DNA modification on individual collisions between Pt nanoparticles (PtNPs) and ultramicroelectrode (UME) surfaces. These results extend recent reports of electrocatalytic amplification (ECA) arising from collisions between naked surfaces, and they are motivated by our interest in using ECA for low-level biosensing applications. In the present case, we studied collisions between naked PtNPs and DNA-modified Au and Hg UMEs and also collisions between DNA-modified PtNPs and naked Au and Hg UMEs. In all cases, the sensing reaction is the catalytic oxidation of N2H4. The presence of ssDNA (5-mer or 25-mer) immobilized on the UME surface has little effect on the magnitude or frequency of ECA signals, regardless of whether the electrode is Au or Hg. In contrast, when DNA is immobilized on the PtNPs and the electrodes are naked, clear trends emerge. Specifically, as the surface concentration of ssDNA on the PtNP surface increases, the magnitude and frequency of the current transients decrease. This trend is most apparent for the longer 25-mer. We interpret these results as follows. When ssDNA is immobilized at high concentration on the PtNPs, the surface sites on the NP required for electrocatalytic N2H4 oxidation are blocked. This leads to lower and fewer ECA signals. In contrast, naked PtNPs are able to transfer electrons to UMEs having sparse coatings of ssDNA.
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Affiliation(s)
- Timothy M Alligrant
- Department of Chemistry and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin , 105 E. 24th St., Stop A5300, Austin, Texas 78712-0165 United States
| | - Radhika Dasari
- Department of Chemistry and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin , 105 E. 24th St., Stop A5300, Austin, Texas 78712-0165 United States
| | - Keith J Stevenson
- Department of Chemistry and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin , 105 E. 24th St., Stop A5300, Austin, Texas 78712-0165 United States
| | - Richard M Crooks
- Department of Chemistry and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin , 105 E. 24th St., Stop A5300, Austin, Texas 78712-0165 United States
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Zheng W, Lin H, Mann BF, Liang L, Gu B. Oxidation of dissolved elemental mercury by thiol compounds under anoxic conditions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:12827-34. [PMID: 24138581 DOI: 10.1021/es402697u] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Mercuric ion, Hg(2+), forms strong complexes with thiolate compounds that commonly dominate Hg(II) speciation in natural freshwater. However, reactions between dissolved aqueous elemental mercury (Hg(0)aq) and organic ligands in general, and thiol compounds in particular, are not well studied although these reactions likely affect Hg speciation and cycling in the environment. In this study, we compared the reaction rates between Hg(0)aq and a number of selected organic ligands with varying molecular structures and sulfur (S) oxidation states in dark, anoxic conditions to assess the role of these ligands in Hg(0)aq oxidation. Significant Hg(0)aq oxidation was observed with all thiols but not with ligands containing no S. Compounds with oxidized S (e.g., disulfide) exhibited little or no reactivity toward Hg(0)aq either at pH 7. The rate and extent of Hg(0)aq oxidation varied greatly depending on the chemical and structural properties of thiols, thiol/Hg ratios, and the presence or absence of electron acceptors. Smaller aliphatic thiols and higher thiol/Hg ratios resulted in higher Hg(0)aq oxidation rates than larger aromatic thiols at lower thiol/Hg ratios. The addition of electron acceptors (e.g., humic acid) also led to substantially increased Hg(0)aq oxidation. Our results suggest that thiol-induced oxidation of Hg(0)aq is important under anoxic conditions and can affect Hg redox transformation and bioavailability for microbial methylation.
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Affiliation(s)
- Wang Zheng
- Environmental Sciences Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37830, United States
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Josypčuk B, Fojta M, Yosypchuk O. Thiolate monolayers formed on different amalgam electrodes. Part II: Properties and application. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.02.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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6
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Ostatná V, Černocká H, Paleček E. Simple protein structure-sensitive chronopotentiometric analysis with dithiothreitol-modified Hg electrodes. Bioelectrochemistry 2012; 87:84-8. [DOI: 10.1016/j.bioelechem.2012.01.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 01/02/2012] [Accepted: 01/09/2012] [Indexed: 12/17/2022]
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7
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Calvente JJ, Molero M, Andreu R, López-Pérez G, Luque AM. Diffusional Surface Voltammetry as a Probe of Adsorption Energetics. Anal Chem 2011; 84:1034-41. [DOI: 10.1021/ac202564w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Juan José Calvente
- Departamento
de Química Física, Facultad
de Química, Universidad de Sevilla, 41012 Sevilla, Spain
| | - Miguel Molero
- Departamento
de Química Física, Facultad
de Química, Universidad de Sevilla, 41012 Sevilla, Spain
| | - Rafael Andreu
- Departamento
de Química Física, Facultad
de Química, Universidad de Sevilla, 41012 Sevilla, Spain
| | - Germán López-Pérez
- Departamento
de Química Física, Facultad
de Química, Universidad de Sevilla, 41012 Sevilla, Spain
| | - Antonio M. Luque
- Departamento
de Química Física, Facultad
de Química, Universidad de Sevilla, 41012 Sevilla, Spain
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Calvente JJ, Andreu R. Accurate Analytical Expressions for Stripping Voltammetry in the Henry Adsorption Limit. Anal Chem 2011; 83:6401-9. [DOI: 10.1021/ac201473z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juan José Calvente
- Departamento de Química Física, Facultad de Química, Universidad de Sevilla, 41012, Sevilla, Spain
| | - Rafael Andreu
- Departamento de Química Física, Facultad de Química, Universidad de Sevilla, 41012, Sevilla, Spain
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Yosypchuk B, Mareček V. Properties of thiolate monolayers formed on different amalgam electrodes. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2011.01.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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Adaligil E, Slowinski K. Electron tunneling through monolayers of alkanethiols self-assembled on a hanging mercury drop electrode in the presence of aliphatic alcohols. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.02.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Doneux T, Steichen M, De Rache A, Buess-Herman C. Influence of the crystallographic orientation on the reductive desorption of self-assembled monolayers on gold electrodes. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.02.032] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ostatná V, Černocká H, Paleček E. Protein Structure-Sensitive Electrocatalysis at Dithiothreitol-Modified Electrodes. J Am Chem Soc 2010; 132:9408-13. [DOI: 10.1021/ja102427y] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Veronika Ostatná
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Královopolská 135, 612 65 Brno; Czech Republic
| | - Hana Černocká
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Královopolská 135, 612 65 Brno; Czech Republic
| | - Emil Paleček
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Královopolská 135, 612 65 Brno; Czech Republic
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Calvente JJ, Molero M, Andreu R, López-Pérez G. Aliphatic alcohols facilitate interfacial reorientation of thiols: correlation with alcohol adsorptivity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5254-5261. [PMID: 19928971 DOI: 10.1021/la9036259] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The influence of a series of aliphatic alcohols on the reorientation of alkylthiols during their self-assembly has been studied by cathodic stripping voltammetry. The presence of an aliphatic alcohol in the deposition solution is shown to lower the critical reorientational surface concentration of alkylthiols, making it less sensitive to molecular size. The use of a series of alcohols differing in their molecular length or branching reveals that the onset of thiol reorientation correlates well with the extent of alcohol adsorption. A theoretical model is developed to account for this effect, whose crux is the competition between the alcohol molecule and the alkyl chain of the thiol for adsorption sites. The analytical expression derived for the critical reorientational surface concentration reveals that the effect of adding alcohol can be rationalized in terms of an apparent reorientation equilibrium constant, which embodies both the bulk concentration and the adsorption equilibrium constant of the relevant alcohol. Overall, these findings corroborate that the interfacial reorientation of n-alkanethiols is sterically controlled and demonstrate that its onset can be finely tuned by addition of a suitable coadsorbate.
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Affiliation(s)
- Juan José Calvente
- Departamento de Química Física, Facultad de Química, Universidad de Sevilla, 41012 Sevilla, Spain.
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Calvente JJ, López-Pérez G, Jurado JM, Andreu R, Molero M, Roldán E. Reorientation of thiols during 2D self-assembly: interplay between steric and energetic factors. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:2914-2923. [PMID: 19764782 DOI: 10.1021/la902981n] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Reorientation of thiols during their 2D self-assembly is well established; however, little is known about its energetics and the factors that control its onset. We have developed a new strategy to determine the critical reorientational surface concentration (crsc) of thiols at the substrate/solution interface, which makes use of a cathodic stripping protocol. Its application to distinct homologous series of alkylthiols shows that the magnitude of the crsc and its variation with the molecular size is strongly dependent on the nature of the terminal group. Methyl-terminated alkylthiols reorient close to the saturation coverage of the lying-down phase, thus following their molecular size trend; whereas reorientation of alkylthiols bearing a negatively charged end group starts well below the monolayer coverage of the lying-down phase, with its onset being almost independent of the molecular size. Hydroxy-terminated alkylthiols show an intermediate behavior. A theoretical approach is developed to determine the reorientation equilibrium constant from the crsc value. The standard free energy of reorientation has been found to vary linearly with the alkyl chain length, and to increase upon replacing the terminal methyl group by a negatively charged one. A quantitative correlation between the reorientation equilibrium constant and the hydrophobicity of the molecule has been established. Overall, these findings have allowed us to disentangle the role of steric and energetic factors in the onset of the reorientation process of alkylthiols, demonstrating that their interplay can be finely tuned by varying either the alkyl chain length or the nature of the terminal group.
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Affiliation(s)
- Juan José Calvente
- Departamento de Química Física, Facultad de Química, Universidad de Sevilla, 41012, Sevilla, Spain.
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Doneux T, Dorcák V, Palecek E. Influence of the interfacial peptide organization on the catalysis of hydrogen evolution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1347-1353. [PMID: 19743826 DOI: 10.1021/la9024603] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The hydrogen evolution reaction is catalyzed by peptides and proteins adsorbed on electrode materials with high overpotentials for this reaction, such as mercury. The catalytic response characteristics are known to be very sensitive to the composition and structure of the investigated biomolecule, opening the way to the implementation of a label-free, reagentless electroanalytical method in protein analysis. Herein, it is shown using the model peptide Cys-Ala-Ala-Ala-Ala-Ala that the interfacial organization significantly influences the catalytic behavior. This peptide forms at the electrode two distinct films, depending on the concentration and accumulation time. The low-coverage film, composed of flat-lying molecules (area per molecule of approximately 250-290 A(2)), yields a well-defined catalytic peak at potentials around -1.75 V. The high-coverage film, made of upright-oriented peptides (area per molecule of approximately 43 A(2)), is catalytically more active and the peak is observed at potentials less negative by approximately 0.4 V. The higher activity, evidenced by constant-current chronopotentiometry and cyclic voltammetry, is attributed to an increase in the acid dissociation constant of the amino acid residues as a result of the low permittivity of the interfacial region, as inferred from impedance measurements. An analogy is made to the known differences in acidic-basic behaviors of solvent-exposed and hydrophobic domains of proteins.
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Affiliation(s)
- Th Doneux
- Institute of Biophysics ASCR, v.v.i., 612 65 Brno, Czech Republic
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Calvente JJ, Andreu R. Probing interfacial solvation of incipient self-assembled monolayers. Phys Chem Chem Phys 2010; 12:13519-21. [DOI: 10.1039/c0cp01423k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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18
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Dissolution kinetics of octadecanethiolate monolayers electro-adsorbed on Au(111). J Electroanal Chem (Lausanne) 2008. [DOI: 10.1016/j.jelechem.2008.01.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Cohen-Atiya M, Nelson A, Mandler D. Characterization of n-alkanethiol self-assembled monolayers on mercury by impedance spectroscopy and potentiometric measurements. J Electroanal Chem (Lausanne) 2006. [DOI: 10.1016/j.jelechem.2006.04.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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González Arias Z, Muñiz Alvarez JL, López Fonseca JM. Formation and electrochemical characterization of 6-thioguanosine monolayers on the mercury surface. J Colloid Interface Sci 2006; 300:60-8. [PMID: 16631768 DOI: 10.1016/j.jcis.2006.03.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2005] [Revised: 03/16/2006] [Accepted: 03/16/2006] [Indexed: 11/29/2022]
Abstract
The interfacial and electrochemical behavior of 6-thioguanosine-6-thioguanine riboside (6TGR)-on a hanging mercury drop electrode was studied with ac and cyclic voltammetry in a solution of 0.1 M Na(2)SO(4) and 0.01 M sodium acetate buffer at pH 4.3. A self-assembled monolayer (SAM) of chemisorbed 6TGR molecules formed under determined adsorption conditions was characterized. A low-density monolayer of chemisorbed 6TGR molecules and a condensed monolayer of physisorbed ones, which are successively formed by reduction of the SAM, were also studied.
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Affiliation(s)
- Zoraida González Arias
- Departamento de Química-Física y Analítica, Universidad de Oviedo, E-33071 Oviedo, Asturias, Spain
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Ramírez P, Andreu R, Calvente JJ, Calzado CJ, López-Pérez G. Electrochemical formation and electron transfer through self-assembled monolayers of 4-mercaptophenol on mercury. J Electroanal Chem (Lausanne) 2005. [DOI: 10.1016/j.jelechem.2005.01.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Calvente JJ, López-Pérez G, Ramírez P, Fernández H, Zón MA, Mulder WH, Andreu R. Experimental Study of the Interplay between Long-Range Electron Transfer and Redox Probe Permeation at Self-Assembled Monolayers: Evidence for Potential-Induced Ion Gating. J Am Chem Soc 2005; 127:6476-86. [PMID: 15853356 DOI: 10.1021/ja050265j] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Evidence for the competition between long-range electron transfer across self-assembled monolayers (SAMs) and incorporation of the redox probe into the film is reported for the electroreduction of Ru(NH(3)) at hydroxyl- and carboxylic-acid-terminated SAMs on a mercury electrode, by using electrochemical techniques that operate at distinct time scales. Two limiting voltammetric behaviors are observed, consistent with a diffusion control of the redox process at mercaptophenol-coated electrodes and a kinetically controlled electron transfer reaction in the presence of neutral HS-(CH(2))(10)-COOH and HS-(CH(2))(n)()-CH(2)OH (n = 3, 5, and 10) SAMs. The monolayer thickness dependence of the standard heterogeneous electron transfer rate constant shows that the electron transfer plane for the reduction of Ru(NH(3)) at hydroxyl-terminated SAMs is located outside the film | solution interface at short times. However, long time scale experiments provide evidence for the occurrence of potential-induced gating of the adsorbed structure in some of the monolayers studied, which takes the form of a chronoamperometric spike. Redox probe permeation is shown to be a kinetically slow process, whose activation strongly depends on redox probe concentration, applied potential, and chemical composition of the intervening medium. The obtained results reveal that self-assembled monolayers made of mercaptobutanol and mercaptophenol preserve their electronic barrier properties up to the reductive desorption potential of a fully grown SAM, whereas those of mercaptohexanol, mercaptoundecanol, and mercaptoundecanoic acid undergo an order/disorder transition below a critical potential, which facilitates the approach of the redox probe toward the electrode surface.
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Affiliation(s)
- Juan José Calvente
- Departamento de Quimica Fisica, Facultad de Quimica, Universidad de Sevilla, 41012, Sevilla, Spain
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