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  • 1
    Electronic Resource
    Electronic Resource
    Thermal and photochemical control of an electrochemical process at an isomerizable spiropyran monolayer-modified Au electrode (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 417-419 
    Details
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Immobilization of pyrroloquinoline quinone on gold by carbodiimide coupling to adsorbed polyamines: Stability comparison to attachment via a chemisorbed thiol monolayer (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 1092-1094 
    Details
    ISSN: 1040-0397
    Keywords: Pyrroloquinoline quinone ; Polyamines ; Immobilization ; Biosensor ; Thiol ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pyrroloquinoline quinone (PQQ) was immobilized on gold electrodes by prior adsorption of the polyamines polyethylenimine, and triethylene tetraamine, followed by carbodiimide coupling of PQQ to the surface-adsorbed amine groups. The stability and electrochemical behavior of the electrodes, in which the amino-containing linker molecule is adsorbed on the electrode surface, were compared with those of electrodes prepared by carbodiimide coupling of PQQ to a cystamine monolayer, in which the sulfur-containing linker molecule is associated with the gold surface. The electrodes prepared using adsorbed polyethylenimine showed comparable stability to those based on a cystamine monolayer, but reveal enhanced stability to application of negative potentials (〈 -1.1 V). The method provides an alternative to the conventional functionalization of Au electrodes by thiols.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140081203
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