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Truong Khoa Tran, Kacem Smaali, Marie Hardouin, Quentin Bricaud, Maïténa Oçafrain, Philippe Blanchard, Stéphane Lenfant, Sylvie Godey, Jean Roncali and Dominique Vuillaume A Crown-Ether Loop-Derivatized Oligothiophene Doubly Attached on Gold Surface as Cation-Binding Switchable Molecular Junction Advanced Materials 25

Version of Record online: 13 AUG 2012 | DOI: 10.1002/adma.201201668

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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 Pb2+ 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 × 103 times) of the current at low bias after Pb2+ complexation.

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