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.
Cite
@article{arxiv.1210.1829,
title = {A Crown-Ether Loop-Derivatized Oligothiophene Doubly Attached on Gold Surface as Cation-Binding Switchable Molecular Junction},
author = {Truong Khoa Tran and Kacem Smaali and Marie Hardouin and Quentin Bricaud and Maitena Ocafrain and Philippe Blanchard and Stephane Lenfant and Sylvie Godey and Jean Roncali and Dominique Vuillaume},
journal= {arXiv preprint arXiv:1210.1829},
year = {2013}
}
Comments
Paper and supplementary information; Advanced Materials (on line, 2012)