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Please use this identifier to cite or link to this item: http://hdl.handle.net/2108/606

Title: Conformationally constrained peptides as new nanomaterials for electrons and energy transfer
Authors: Venanzi, Mariano
Gatto, Emanuela
Keywords: peptides
electron transfer
SAM
photocurrent
310-helix
foldamer
Issue Date: 1-Sep-2008
Abstract: In this thesis the electron mediating properties of 310 helical peptides have been investigated, both in solution and on gold surfaces, by means of photochemical, electrochemical and photoelectrochemical methods. The directional character of the electron transfer process along helical oligopeptides as a result of the electrostatic field associated to the helix macrodipole is demostrated. It is shown that this effect is smaller for a 310 helix than that in a alpha-helix, because of the carbonyl dipole distortion with respect to the helical axis. For very short peptides the helix macrodipole does not affect very much the redox potential of the probe and of the gold surfaces, but it affects the electron transfer rate toward the gold substrate. The ability of short helical peptides to generate photocurrent is also demonstrated, together with the possibility of constructing a molecular photodiode able to switch the current direction. It is also shown that the gold substrate on which th...
Description: 19. ciclo
URI: http://hdl.handle.net/2108/606
Appears in Collections:Tesi di dottorato in scienze matematiche e fisiche

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