Oligofluorene Molecular Wires: Synthesis and Single-Molecule Conductance
| Autor: | Sujun Wei, Cole Sagan, Francisco Caban, Yi Jiang, Jordan Snaider, Rene Amell, Gina M. Florio |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Conductance 02 engineering and technology Fluorene 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Crystallography Molecular wire chemistry.chemical_compound General Energy law Molecular conductance Molecule Amine gas treating Physical and Theoretical Chemistry Scanning tunneling microscope 0210 nano-technology Quantum tunnelling |
| Zdroj: | The Journal of Physical Chemistry C. 121:24945-24953 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.7b07713 |
| Popis: | We report the synthesis and molecular junction conductance for a series of oligofluorenes to establish clear structure–property relationships for this electronically important material. We use a scanning tunneling microscopy based break-junction method (STM-BJ) to measure single-molecule conductance in oligofluorenes that vary in (a) the number of fluorene repeat units (n = 1–3), (b) bridge carbon substitution (dihydrogen, dimethyl, dihexyl, and didodecyl), and (c) linker-group termination (methyl sulfide versus primary amine). Conductance in oligofluorene molecular junctions is found to occur via tunneling, with a tunneling decay constant, β, of 0.31 per A, or equivalently, 2.6 per fluorene unit, consistent with other π-conjugated molecular wires. Simple tunnel coupling calculations for model Au2-oligofluorene molecular clusters are reported to validate experimental conductance measurements. Finally, molecular conductance distributions for methyl sulfide terminated oligofluorenes are observed to be extre... |
| Databáze: | OpenAIRE |
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