Electrochemically controllable reversible formation of cucurbit[8]uril-stabilized charge-transfer complex on surface
SCIE
SCOPUS
- Title
- Electrochemically controllable reversible formation of cucurbit[8]uril-stabilized charge-transfer complex on surface
- Authors
- Kang, JK; Hwang, I; Ko, YH; Jeon, WS; Kim, HJ; Kim, K
- Date Issued
- 2008-01
- Publisher
- TAYLOR & FRANCIS LTD
- Abstract
- The reversible formation of cucurbit[8]uril (CB[8])-stabilized charge-transfer (CT) complex on gold, which can be regulated by electrochemical stimuli, is reported. A viologen-based thread molecule with a thiol terminus was designed to synthesise a stable CB[8]-threaded [2]pseudorotaxane (5(2+)). A mixed self-assembled monolayer (SAM) of 5(2+) and 3-mercaptopropionic acid (3-MPA) on gold was prepared and characterised by reflectance FT-IR spectroscopy. The formation and disruption of a CT complex on surface was investigated by cyclic voltammetry with the SAM on gold as a working electrode in a supporting electrolyte solution containing 2,6-dihydroxynaphthalene (DHNp). The cathodic peak was shifted to a more negative potential (Delta E similar to 40mV) when compared with that measured without DHNp in the electrolyte, which confirmed the formation of a CT complex on gold upon immersion of the SAM of 5(2+) on gold in the supporting electrolyte containing DHNp. When the viologen unit was reduced, the CT complex was destroyed and the electron-rich guest molecule was released. Upon reoxidation of the reduced viologen unit, however, the CT complex was slowly reformed.
- Keywords
- charge-transfer complex; cucurbituril; cyclic voltammetry; host-guest chemistry; self-assembled monolayer; DNA-BINDING AFFINITY; CRYSTAL-STRUCTURE; MOLECULAR RECOGNITION; COUPLING REAGENTS; NATURAL-PRODUCTS; STRUCTURAL BASIS; STABILITY; FEATURES; BROMIDE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22886
- DOI
- 10.1080/10610270701742587
- ISSN
- 1061-0278
- Article Type
- Article
- Citation
- SUPRAMOLECULAR CHEMISTRY, vol. 20, no. 1-2, page. 149 - 155, 2008-01
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