Project Title

Charge Transport through Perylene Bisimide Molecular Junctions at Electrified Solid/Liquid
Interfaces II

Principal Investigators

Dr. Frank Würthner, Universität Würzburg [Homepage]

Dr. Ferdinand Evers, Universität Karlsruhe [Homepage ]

Dr. Thomas Wandlowski, Universität Bern [Homepage ]

Abstract

Charge transport and switching in metal│molecule│metal junctions will be investigated
between a scanning tunnelling microscope tip and a metal substrate employing the concept
of “electrolyte gating”. Our target molecules represent custom-designed molecular rods
composed of redox-active perylene bisimide (PBI) electrophores bearing tailored spacer
units and anchor groups. We aim to study the electron transport through single molecules
and explore concepts of redox-gated molecular nanostructures. Ab initio electronic structure
and transport calculations will be applied to unravel energetic and microscopic details of the
junction and of the switching mechanisms. The project will provide unique new insight into
structure - property relationships of electron transport processes in single molecule
assemblies which are triggered by electrical stimuli with potential applications towards
molecular redox switches.

Highlight Papers

References

7.	David Vonlanthen, Artem Mishchenko, Mark Elbing, Markus Neuburger et al. Chemically Controlled Conducctivity: Torsion-Angle Dependence in a Single-Molecule Biphenyldithiol Junction Angew. Chem. Int. Ed, 2009 DOI: 10.1002/anie.200903946
6.	Artem Mischenko, David Volanthen, Velimir Meded, Marius Bürkle et al. Influence of Conformation on Conductance of Biphenyl-Dithiol Single-Molecule Contacts Nano Letters, 2009 DOI: 10.1021/nl903084b
5.	Velimir Meded, Alexei Bagrets, Andreas Arnold and Ferdinand Evers Molecular Switch Controlled bz Pulsed Bias Voltages small, 2009 DOI: 10,1002-smll.200801865
4.	Ilza V. Pobelov, Yhihai Li and Thomas Wandlowski Electrolzte Gating in RedoxßActive Tunneling Junctions # An Electrochemical STM Approach Journal of the American Chemical Society, November 2008 DOI: 10.1021/ja8054194
3.	Chen Li, Ilya Pobelov, Thomas Wandlowski, Alexei Bagrets et al. Charge transport in single Au vertical bar alkanedithiol vertical bar Au junctions: Coordination geometries and conformational degrees of freedom J. Am. Chem.Soc., January 2008 DOI: 10.1021/ja0762386
2.	Alexei Bagrets, Andreas Arnold and Ferdinand Evers Conduction Properties of Bipyridinium-Functionalized Molecular Wires J. Am. Chem.Soc., 2008 DOI: 10.1021/ja800459k
1.	C. Li, A. Mishchenko, Z. Li, I. Pobelov et al. Electrochemical gate-controlled electron transport of redox-active single perylene bisimide molecular junctions Journal of Physics: Condensed Matter, 20(37) 2008 DOI: 10.1088/0953-8984/20/37/374122

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