English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We measure electronic conductance through single conjugated molecules bondedto Au metal electrodes with direct Au-C covalent bonds using the scanningtunneling microscope based break-junction technique. We start with moleculesterminated with trimethyltin end groups that cleave off in situ resulting information of a direct covalent sigma bond between the carbon backbone and thegold metal electrodes. The molecular carbon backbone used in this study consistof a conjugated pi-system that has one terminal methylene group on each end,which bonds to the electrodes, achieving large electronic coupling of theelectrodes to the pi-system. The junctions formed with the prototypical exampleof 1,4-dimethylenebenzene show a conductance approaching one conductancequantum (G0 = 2e2/h). Junctions formed with methylene terminated oligophenylswith two to four phenyl units show a hundred-fold increase in conductancecompared with junctions formed with amine-linked oligophenyls. The conductionmechanism for these longer oligophenyls is tunneling as they exhibit anexponential dependence of conductance with oligomer length. In addition,density functional theory based calculations for the Au-xylylene-Au junctionshow near-resonant transmission with a cross-over to tunneling for the longeroligomers.

Highly Conducting pi-Conjugated Molecular Junctions Covalently Bonded to Gold Electrodes