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 for its covalent immobilization by double fixation on gold surface. While the corresponding dithioester precursor exhibits Pb2+ complexation properties in solution as evidenced by UV-vis spectroscopy and cyclic voltammetry, this Pb2+ affinity is still maintained for monolayers of the dithiol on gold. In addition, current-voltage measurements by Eutectic GaIn drop contact on the monolayer show a significant increase (up to 1.6 x 1E3) of the current at low bias after Pb2+ complexation.

Paper and supplementary information; Advanced Materials (on line, 2012)

References in corpus (4)

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• High on-off conductance switching ratio in optically-driven self-assembled conjugated molecular systems
• Quantifying Transition Voltage Spectroscopy of Molecular Junctions
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• Dichotomy between Level Broadening and Level Coupling to Electrodes in Large Area EGaIn Molecular Junctions