PHOTOSTIMULATED INTERACTIONS OF BIPYRIDINIUM-AZOBENZENE WITH A BETA-AMINOCYCLODEXTRIN MONOLAYER-FUNCTIONALIZED ELECTRODE - AN OPTOELECTRONIC ASSEMBLY FOR THE AMPEROMETRIC TRANSDUCTION OF RECORDED OPTICAL SIGNALS

An amino-functionalized beta-cyclodextrin is covalently linked to a th iopropionic acid-active ester monolayer associated with a Au electrode to yield a cyclodextrin monolayer electrode. The photoisomerizable el ectron acceptor trans or cis ridinium-4-(4'-N'-methylenepyridinium)-az obenzene, It or Ic, respectively, exhibit different binding affinities for the beta-cyclodextrin-receptor-monolayer. The photoisomer It has a high affinity for the cyclodextrin monolayer while Ic exhibits low b inding interactions to the monolayer interface. The photostimulated bi nding and dissociation of It or Ic to and from the monolayer are trans duced electrochemically. The association and dissociation of the photo isomerizable substrate to and from the monolayer are confirmed by micr ogravimetric, quartz-crystal-microbalance experiments.