MAT Seminar

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Synthesis of Functional Diaryloligoyne Molecular Wires and Their Single-
Molecule Junction Characteristics

Murat Gulcur

Durham University, Department of Chemistry, South Road, Science Site, Durham, DH1 3LE
United Kingdom

Current Address: University of Leeds, School of Chemistry, Woodhouse Lane, Leeds, LS2 9JT,
United Kingdom

Due to the rapid growth in the electronics industry for over the last century, the demand for advanced materials has been raised. As a result of this, the number of the scientific studies to develop new type of electronic materials has increased and new fields of research such as molecular electronics and nanotechnology are now established. The trend in the advances in electronics follows the miniaturisation of the electrical components and therefore introducing single or a few molecules into electronic devices has become an important topic.
A standard protocol for accurately assessing the charge transport through single or a few molecules is to anchor the molecule(s) between metal electrodes (often gold) and to study the electronic properties of the metal-molecule-metal junction by scanning tunnelling microscopy (STM) or mechanically controllable break junction (MCBJ) techniques.1

Polyynes and shorter sp oligomers (oligoynes) have been proposed for molecular electronics applications (wires, switches, non-linear optics, etc).2 Unlike oligo(phenylenevinylene) (OPV) and oligo(phenyleneethynylene) (OPE) the conjugation over the oligo/polyyne carbon backbone is not interrupted by intramolecular rotations. Theoretical studies have predicted that polyynes should have excellent intramolecular electron- and charge-transport properties, exhibiting efficient molecular wire behavior.3 In this regard; experimental studies are very much an open issue.

In this talk, a summary of the new aspects and developments in the field of single-molecule electronics will be presented. A series of functional diaryloligoyne molecules are synthesised and single-molecule conductances of those molecules were systematically compared.

1- W. Hong et al,. J. Amer. Chem. Soc., 2012, 134, 2292.
2- [a] A. D. Slepkov et. al, J. Chem. Phys. 2004, 120, 6807. [b] J. Cornil, et. al, Adv. Mater. 2001, 13, 1053.
3- Ž. Crljen, G. Baranović, Phys. Rev. Lett. 2007, 98, 116801.