Příprava, charakterizace a studium přenosu elektronu v samoorganizovaných strukturách na pevných elektrodách

Kolivoška, Viliam

The presented thesis focuses on electrochemical, spectroelectrochemical, adsorption, complexation and conductivity properties of extended viologens of variable length (the compounds 1 to 6). In the future, their molecules could serve as conducting molecular wires in the devices of molecular electronics. At the mercury/electrolyte interface, all studied compounds were found to form a compact monolayer with flat-lying molecules with the diffusion as the rate-determining step. The presence of adsorbed molecules on Au(111) surface was confirmed by STM and PM IRRAS techniques. The extended viologen molecule consisting of one repeating unit (the compound 1) was found to reversibly transfer four electrons, behaving as a fully delocalized system. On the other hand, the molecule of the compound 2 transfers two electrons independently, having thus two non-communicating centers. The molecules containing higher number of repeating units (n) transfer 2(n-1) electrons in the first two closely-positioned reduction steps (with n-1 electrons being independently consumed in each of them). Chemical stability of reduced forms of the compounds 1 to 6 was confirmed by UV/VIS/NIR in-situ spectroelectrochemical techniques. Electric conductance of junctions containing extended viologen molecules (scrutinized by Tao's...

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