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Gonzalez J, Martinez-Ortiz F, Torralba E, Molina A. Kinetic Influence of Surface Charge Transfer Reactions Preceded by Non-Electrochemical Processes on the Response in Cyclic Voltammetry. ChemElectroChem 2018. [DOI: 10.1002/celc.201801275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Joaquin Gonzalez
- Departamento de Química Física Facultad de Química Regional Campus of International Excellence “Campus Mare Nostrum”; Universidad de Murcia; 30100 Murcia Spain
| | - Francisco Martinez-Ortiz
- Departamento de Química Física Facultad de Química Regional Campus of International Excellence “Campus Mare Nostrum”; Universidad de Murcia; 30100 Murcia Spain
| | | | - Angela Molina
- Departamento de Química Física Facultad de Química Regional Campus of International Excellence “Campus Mare Nostrum”; Universidad de Murcia; 30100 Murcia Spain
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Méndez-Ardoy A, Steentjes T, Boukamp BA, Jonkheijm P, Kudernac T, Huskens J. Electron-Transfer Rates in Host-Guest Assemblies at β-Cyclodextrin Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8614-8623. [PMID: 28013541 DOI: 10.1021/acs.langmuir.6b03860] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The effect of the distance between a β-cyclodextrin (βCD) host core and a conductive substrate on the electron-transfer rate of complexed guests as well as of free-diffusing electrochemically active probes has been studied. First we have evaluated a set of short-tethered βCD adsorbates bearing different anchoring groups in order to get a reliable platform for the study of short-distance electron transfer. An electrochemically active trivalent guest was immobilized on these host monolayers in a selective and reversible manner, providing information about the packing density. Iodine- and nitrile-functionalized βCD monolayers gave coverages close to maximum packing. Electron transfer in the presence of Fe(CN)63-/4- studied by impedance spectroscopy revealed that the electron transfer of the diffusing probe was 3 orders of magnitude faster than when the βCD cores were separated from the surface by undecyl chains. When an electrochemically active guest was immobilized on the surface, electron-transfer rate measurements by cyclic voltammetry and capacitance spectroscopy showed differences of up to a factor of 8 for different βCD monolayers. These results suggest that increasing the distance between the βCD core and the underlying conductive substrate leads to a diminishing of the electron-transfer rate.
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Affiliation(s)
- Alejandro Méndez-Ardoy
- Molecular Nanofabrication Group and ‡Inorganic Materials Science Group, Department of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente , P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Tom Steentjes
- Molecular Nanofabrication Group and ‡Inorganic Materials Science Group, Department of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente , P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Bernard A Boukamp
- Molecular Nanofabrication Group and ‡Inorganic Materials Science Group, Department of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente , P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Pascal Jonkheijm
- Molecular Nanofabrication Group and ‡Inorganic Materials Science Group, Department of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente , P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Tibor Kudernac
- Molecular Nanofabrication Group and ‡Inorganic Materials Science Group, Department of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente , P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Jurriaan Huskens
- Molecular Nanofabrication Group and ‡Inorganic Materials Science Group, Department of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente , P.O. Box 217, 7500 AE Enschede, The Netherlands
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Niu Y, Huang T, Zhou Z, Xu G, Zhang L, Wei T. Formation of cyclodextrin monolayer through a host–guest interaction with tailor-made phenyltriethoxysilane self-assembled monolayer. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.01.088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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