INVESTIGADORES
RUBERT Aldo Alberto
congresos y reuniones científicas
Título:
The effect of the terminal groups in the redox properties of Cu acetate complexes immobilized on aromatic and aliphatic thiols
Autor/es:
R.URCUYO; EMILIANO CORTÉS; M.MONTERO; A A. RUBERT; G.A. BENÍTEZ; M. ELENA VELA; R.C. SALVAREZZA
Lugar:
Nice, France
Reunión:
Congreso; 61st Annual Meeting of international Society of Electrochemistry; 2010
Institución organizadora:
international Society of Electrochemistry
Resumen:
Organic molecules can be used as electronic components in metal-metal junctions or asmolecular wires to connect with electroactive species in solutions. The simplestmolecular junctions are thiols and dithiols where the thiol molecules are bonded to ametal surface by a strong covalent bond. The fabrication of more complex molecularstructures consisting of electron transport carriers bonded to the thiols molecules byweak interactions or covalent bonds have been extensively studied in recent years.Coordination chemistry also open the possibility of immobilize metallic complexes tometals by interaction of the metallic centers with specific atoms of the terminal groupsof the SAMs. In contrast to non specific interactions coordination chemistry allows tocontrol the spatial configuration of the complex supramolecular structure.In this communication we present the results of the study of the immobilization of acopper acetate complex on N, COO-, S donors at the terminal group of differentaliphatic and aromatic thiols to understand the influence of the terminal-group-metalion contact in the charge transfer process and the capability of charge transfer processto occur.The voltammetric data on the complex/functionalized SAM Au interface shows thetypical redox couple corresponding to Cu(II)/ Cu(I) species indicating that the Cu ionicspecies are immobilized in the thiol SAMs, and that at least some of them, areelectrochemically active, i.e. they are able to participate in the charge transfer processwith the Au electrode through the SAMs. XPS spectra of the different supramolecularstructures allow discussing the role of chain length and chemical nature of the terminalanchor in the efficiency of charge transfer.
