Centre d’Élaboration de Matériaux et d’Etudes Structurales (UPR 8011)


Accueil > Recherche > GNS : Groupe NanoSciences > Machines moléculaires

Molecular switch

Staff : O. Guillermet, V. Langlais, J. Bonvoisin & S. Gauthier
Ph.D. students & Postdocs : T. Leoni, H. Walch, A. Scheuermann

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Commutation du bis-dibenzoylmethanato-copper (C30H22O4Cu) entre le complexe plan-carré neutre et le complexe tétraèdrique chargé négativement.
© CEMES-CNRS

Scanning tunneling microscopy (STM) and dynamic force microscopy in the noncontact mode (nc-afm) are used in combination to investigate the reversible switching between two stable states of a copper complex (see the illustration) adsorbed on a NaCl bilayer grown on Cu(111). The molecular conformation in these two states is deduced from scanning tunneling microscopy imaging, while their charge is characterized by the direct measurement of the tip-molecule electrostatic force. These measurements demonstrate that the molecular bistability is achieved through a charge-induced rearrangement of the coordination sphere of the metal complex, qualifying this system as a new electromechanical single-molecular switch.

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(a)–(e) Suite d’images STM montrant la commutation réversible de deux molécules. La position de la pointe au-dessus de la molécule pendant l’application de la tension est reperée par un cercle noir. (f ) Représentation 3D de l’image (b).
© CEMES-CNRS

 

Selected publications

Controlling the charge state of a single redox molecular switch, Leoni T, Guillermet O, Walch H, Langlais V, Scheuermann A, Bonvoisin J, and Gauthier S, Physical Review Letters, 106, pp 216103 (2011)