title: A crown-ether loop-derivatized oligothiophene doubly attached on gold surface as cation-binding switchable molecular junction.
abstract: A crown-ether dithiol quaterthiophene is synthesized and immobilized on gold surface by double covalent fixation. UV-vis spectroscopy and cyclic voltammetry show that the corresponding dithioester precursor can complex Pb(2+)  in solution and that this property is maintained for monolayers of the dithiol on gold. Current-voltage measurements by eutectic GaIn drop contact on the monolayer show a significant increase (up to 1.6 × 10(3)  times) of the current at low bias after Pb(2+)  complexation.
authors.affiliation: LUNAM, University of Angers, CNRS UMR 6200, MOLTECH-Anjou, Group Linear Conjugated Systems, 2 Bd Lavoisier, 49045 Angers cedex, France.
authors.forename: Truong Khoa
authors.initials: TK
authors.lastname: Tran
authors.forename: Kacem
authors.initials: K
authors.lastname: Smaali
authors.forename: Marie
authors.initials: M
authors.lastname: Hardouin
authors.forename: Quentin
authors.initials: Q
authors.lastname: Bricaud
authors.forename: Maïténa
authors.initials: M
authors.lastname: Oçafrain
authors.forename: Philippe
authors.initials: P
authors.lastname: Blanchard
authors.forename: Stéphane
authors.initials: S
authors.lastname: Lenfant
authors.forename: Sylvie
authors.initials: S
authors.lastname: Godey
authors.forename: Jean
authors.initials: J
authors.lastname: Roncali
authors.forename: Dominique
authors.initials: D
authors.lastname: Vuillaume