ISSN:
1040-0397
Keywords:
Switchable electrode
;
Thermal effects
;
Electrochemical kinetics
;
Spiropyran monolayers
;
Pyrroloquinolino quinone
;
Isomerizable monolayer electrodes
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
An isomerizable monolayer-modified electrode is used to control interfacial electron transfer by means of external signals. A spiropyran (SP) monolayer undergoes thermal isomerization to the positively charged merocyanine monolayer, MRH+, while the latter isomer monolayer is photoisomerized, λ 〉 475 nm, to the SP-monolayer state. Pyrroloquinolino quinone (PQQ) is used as redox component for probing the interfacial electron transfer. The MRH+-monolayer electrode attracts the negatively charged PQQ and effective electron transfer is attained. Upon photochemical isomerization to the SP-monolayer electrode, the interfacial electron transfer is inhibited. Reversible activation and deactivation of the interfacial electron transfer is accomplished by cyclic isomerization of the monolayer through the MRH+ and SP-states, respectively, using thermal and photochemical signals.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140070503
Permalink
