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Oligo(aryleneethynylene)s with Terminal Pyridyl Groups: Synthesis and Length Dependence of the Tunneling-to-Hopping Transition of Single-Molecule Conductances

DOI: 10.1021/cm4029484 DOI Help

Authors: Xiaotao Zhao (Durham University) , Cancan Huang (University of Bern) , Murat Gulcur (Durham University) , Andrei Batsanov (University of Durham) , Masoud Baghernejad (University of Bern) , Wenjing Hong (University of Bern) , Martin R. Bryce (Durham University) , Thomas Wandlowski (University of Bern)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry Of Materials , VOL 25 (21) , PAGES 4340 - 4347

State: Published (Approved)
Published: November 2013
Diamond Proposal Number(s): 6749

Abstract: The synthesis is reported of a new series of oligo(aryleneethynylene) (OAE) derivatives of up to ca. 6 nm in molecular length (OAE9) using iterative Pd-mediated Sonogashira cross-coupling methodology. The oligo-p-phenyleneethynylene cores of the molecular wires are functionalized at both termini with pyridyl units for attachment to gold leads. The molecular structures determined by single-crystal X-ray analysis are reported for OAE4, OAE5, OAE7, and OAE8a. The charge transport characteristics of derivatives OAE3–OAE9 in single-molecular junctions have been studied using the mechanically controlled break junction technique. The data demonstrate that the junction conductance decreases with increasing molecular length. A transition from coherent transport via tunneling to a hopping mechanism is found for OAE wires longer than ca. 3 nm.

Journal Keywords: hopping; molecular electronics; oligo(aryleneethynylene); oligomer; single-molecule conductance; synthesis; tunneling

Subject Areas: Chemistry, Materials

Instruments: I19-Small Molecule Single Crystal Diffraction

Added On: 27/11/2013 15:03

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