期刊
CHEMISTRY OF MATERIALS
卷 25, 期 21, 页码 4340-4347出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm4029484
关键词
molecular electronics; synthesis; oligomer; oligo(aryleneethynylene); single-molecule conductance; tunneling; hopping
资金
- China Scholarship Council
- European Commission (EC) FP7 ITN FUNMOLS [212942]
- Swiss National Science Foundation [200020_144471/1]
- Swiss National Science Foundation (SNF) [200020_144471] Funding Source: Swiss National Science Foundation (SNF)
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.
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