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A Crown‐Ether Loop‐Derivatized Oligothiophene Doubly Attached on Gold Surface as Cation‐Binding Switchable Molecular Junction
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, …