Electrostatically-induced inclusion of anions in cyclodextrin monolayers on electrodes
Oxidative mercury-thiolate bond formation accounts for the assembly of densely packed monolayers of per-2,3-methylated per-6-thiolated {alpha}-, {beta}-, and {gamma}-cyclodextrins on the hanging mercury drop electrode. Inclusion of inorganic ions and uncharged hydrophobic guests into these monolayers was investigated by capacitance measurements. In the range of potentials where the electrode is positively charged, the interfacial capacitance depends on the type of electrolyte anions and on the applied potential. This can be explained with electrostatic double-layer forces. Changes in the capacitance can serve as a general signal transduction mode to monitor interactions between cyclodextrin monolayers and charged or neutral guests. Also, the extension of these types of measurements into solid electrodes and the application to other guest-selective host monolayers open the possibility of designing a novel type of electrochemical sensors for electroinactive analytes.
- Research Organization:
- Univ. of California, Berkeley, CA (US)
- Sponsoring Organization:
- Japanese Society for the Promotion of Science; US National Science Foundation; Sandia National Laboratory
- OSTI ID:
- 20015199
- Journal Information:
- Langmuir, Journal Name: Langmuir Journal Issue: 3 Vol. 16; ISSN LANGD5; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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